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# Module doctest.
# Released to the public domain 16-Jan-2001, by Tim Peters (tim@python.org).
# Major enhancements and refactoring by:
# Jim Fulton
# Edward Loper
# Provided as-is; use at your own risk; no warranty; no promises; enjoy!
#
# Modified for inclusion in nose to provide support for DocFileTest in
# python 2.3:
#
# - all doctests removed from module (they fail under 2.3 and 2.5)
# - now handles the $py.class extension when ran under Jython
r"""Module doctest -- a framework for running examples in docstrings.
In simplest use, end each module M to be tested with:
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
_test()
Then running the module as a script will cause the examples in the
docstrings to get executed and verified:
python M.py
This won't display anything unless an example fails, in which case the
failing example(s) and the cause(s) of the failure(s) are printed to stdout
(why not stderr? because stderr is a lame hack <0.2 wink>), and the final
line of output is "Test failed.".
Run it with the -v switch instead:
python M.py -v
and a detailed report of all examples tried is printed to stdout, along
with assorted summaries at the end.
You can force verbose mode by passing "verbose=True" to testmod, or prohibit
it by passing "verbose=False". In either of those cases, sys.argv is not
examined by testmod.
There are a variety of other ways to run doctests, including integration
with the unittest framework, and support for running non-Python text
files containing doctests. There are also many ways to override parts
of doctest's default behaviors. See the Library Reference Manual for
details.
"""
__docformat__ = 'reStructuredText en'
__all__ = [
# 0, Option Flags
'register_optionflag',
'DONT_ACCEPT_TRUE_FOR_1',
'DONT_ACCEPT_BLANKLINE',
'NORMALIZE_WHITESPACE',
'ELLIPSIS',
'IGNORE_EXCEPTION_DETAIL',
'COMPARISON_FLAGS',
'REPORT_UDIFF',
'REPORT_CDIFF',
'REPORT_NDIFF',
'REPORT_ONLY_FIRST_FAILURE',
'REPORTING_FLAGS',
# 1. Utility Functions
'is_private',
# 2. Example & DocTest
'Example',
'DocTest',
# 3. Doctest Parser
'DocTestParser',
# 4. Doctest Finder
'DocTestFinder',
# 5. Doctest Runner
'DocTestRunner',
'OutputChecker',
'DocTestFailure',
'UnexpectedException',
'DebugRunner',
# 6. Test Functions
'testmod',
'testfile',
'run_docstring_examples',
# 7. Tester
'Tester',
# 8. Unittest Support
'DocTestSuite',
'DocFileSuite',
'set_unittest_reportflags',
# 9. Debugging Support
'script_from_examples',
'testsource',
'debug_src',
'debug',
]
import __future__
import sys, traceback, inspect, linecache, os, re
import unittest, difflib, pdb, tempfile
import warnings
from io import StringIO
# Don't whine about the deprecated is_private function in this
# module's tests.
warnings.filterwarnings("ignore", "is_private", DeprecationWarning,
__name__, 0)
# There are 4 basic classes:
# - Example: a <source, want> pair, plus an intra-docstring line number.
# - DocTest: a collection of examples, parsed from a docstring, plus
# info about where the docstring came from (name, filename, lineno).
# - DocTestFinder: extracts DocTests from a given object's docstring and
# its contained objects' docstrings.
# - DocTestRunner: runs DocTest cases, and accumulates statistics.
#
# So the basic picture is:
#
# list of:
# +------+ +---------+ +-------+
# |object| --DocTestFinder-> | DocTest | --DocTestRunner-> |results|
# +------+ +---------+ +-------+
# | Example |
# | ... |
# | Example |
# +---------+
# Option constants.
OPTIONFLAGS_BY_NAME = {}
def register_optionflag(name):
# Create a new flag unless `name` is already known.
return OPTIONFLAGS_BY_NAME.setdefault(name, 1 << len(OPTIONFLAGS_BY_NAME))
DONT_ACCEPT_TRUE_FOR_1 = register_optionflag('DONT_ACCEPT_TRUE_FOR_1')
DONT_ACCEPT_BLANKLINE = register_optionflag('DONT_ACCEPT_BLANKLINE')
NORMALIZE_WHITESPACE = register_optionflag('NORMALIZE_WHITESPACE')
ELLIPSIS = register_optionflag('ELLIPSIS')
IGNORE_EXCEPTION_DETAIL = register_optionflag('IGNORE_EXCEPTION_DETAIL')
COMPARISON_FLAGS = (DONT_ACCEPT_TRUE_FOR_1 |
DONT_ACCEPT_BLANKLINE |
NORMALIZE_WHITESPACE |
ELLIPSIS |
IGNORE_EXCEPTION_DETAIL)
REPORT_UDIFF = register_optionflag('REPORT_UDIFF')
REPORT_CDIFF = register_optionflag('REPORT_CDIFF')
REPORT_NDIFF = register_optionflag('REPORT_NDIFF')
REPORT_ONLY_FIRST_FAILURE = register_optionflag('REPORT_ONLY_FIRST_FAILURE')
REPORTING_FLAGS = (REPORT_UDIFF |
REPORT_CDIFF |
REPORT_NDIFF |
REPORT_ONLY_FIRST_FAILURE)
# Special string markers for use in `want` strings:
BLANKLINE_MARKER = '<BLANKLINE>'
ELLIPSIS_MARKER = '...'
######################################################################
## Table of Contents
######################################################################
# 1. Utility Functions
# 2. Example & DocTest -- store test cases
# 3. DocTest Parser -- extracts examples from strings
# 4. DocTest Finder -- extracts test cases from objects
# 5. DocTest Runner -- runs test cases
# 6. Test Functions -- convenient wrappers for testing
# 7. Tester Class -- for backwards compatibility
# 8. Unittest Support
# 9. Debugging Support
# 10. Example Usage
######################################################################
## 1. Utility Functions
######################################################################
def is_private(prefix, base):
"""prefix, base -> true iff name prefix + "." + base is "private".
Prefix may be an empty string, and base does not contain a period.
Prefix is ignored (although functions you write conforming to this
protocol may make use of it).
Return true iff base begins with an (at least one) underscore, but
does not both begin and end with (at least) two underscores.
"""
warnings.warn("is_private is deprecated; it wasn't useful; "
"examine DocTestFinder.find() lists instead",
DeprecationWarning, stacklevel=2)
return base[:1] == "_" and not base[:2] == "__" == base[-2:]
def _extract_future_flags(globs):
"""
Return the compiler-flags associated with the future features that
have been imported into the given namespace (globs).
"""
flags = 0
for fname in __future__.all_feature_names:
feature = globs.get(fname, None)
if feature is getattr(__future__, fname):
flags |= feature.compiler_flag
return flags
def _normalize_module(module, depth=2):
"""
Return the module specified by `module`. In particular:
- If `module` is a module, then return module.
- If `module` is a string, then import and return the
module with that name.
- If `module` is None, then return the calling module.
The calling module is assumed to be the module of
the stack frame at the given depth in the call stack.
"""
if inspect.ismodule(module):
return module
elif isinstance(module, str):
return __import__(module, globals(), locals(), ["*"])
elif module is None:
return sys.modules[sys._getframe(depth).f_globals['__name__']]
else:
raise TypeError("Expected a module, string, or None")
def _indent(s, indent=4):
"""
Add the given number of space characters to the beginning every
non-blank line in `s`, and return the result.
"""
# This regexp matches the start of non-blank lines:
return re.sub('(?m)^(?!$)', indent*' ', s)
def _exception_traceback(exc_info):
"""
Return a string containing a traceback message for the given
exc_info tuple (as returned by sys.exc_info()).
"""
# Get a traceback message.
excout = StringIO()
exc_type, exc_val, exc_tb = exc_info
traceback.print_exception(exc_type, exc_val, exc_tb, file=excout)
return excout.getvalue()
# Override some StringIO methods.
class _SpoofOut(StringIO):
def getvalue(self):
result = StringIO.getvalue(self)
# If anything at all was written, make sure there's a trailing
# newline. There's no way for the expected output to indicate
# that a trailing newline is missing.
if result and not result.endswith("\n"):
result += "\n"
# Prevent softspace from screwing up the next test case, in
# case they used print with a trailing comma in an example.
if hasattr(self, "softspace"):
del self.softspace
return result
def truncate(self, size=None):
StringIO.truncate(self, size)
if hasattr(self, "softspace"):
del self.softspace
# Worst-case linear-time ellipsis matching.
def _ellipsis_match(want, got):
if ELLIPSIS_MARKER not in want:
return want == got
# Find "the real" strings.
ws = want.split(ELLIPSIS_MARKER)
assert len(ws) >= 2
# Deal with exact matches possibly needed at one or both ends.
startpos, endpos = 0, len(got)
w = ws[0]
if w: # starts with exact match
if got.startswith(w):
startpos = len(w)
del ws[0]
else:
return False
w = ws[-1]
if w: # ends with exact match
if got.endswith(w):
endpos -= len(w)
del ws[-1]
else:
return False
if startpos > endpos:
# Exact end matches required more characters than we have, as in
# _ellipsis_match('aa...aa', 'aaa')
return False
# For the rest, we only need to find the leftmost non-overlapping
# match for each piece. If there's no overall match that way alone,
# there's no overall match period.
for w in ws:
# w may be '' at times, if there are consecutive ellipses, or
# due to an ellipsis at the start or end of `want`. That's OK.
# Search for an empty string succeeds, and doesn't change startpos.
startpos = got.find(w, startpos, endpos)
if startpos < 0:
return False
startpos += len(w)
return True
def _comment_line(line):
"Return a commented form of the given line"
line = line.rstrip()
if line:
return '# '+line
else:
return '#'
class _OutputRedirectingPdb(pdb.Pdb):
"""
A specialized version of the python debugger that redirects stdout
to a given stream when interacting with the user. Stdout is *not*
redirected when traced code is executed.
"""
def __init__(self, out):
self.__out = out
pdb.Pdb.__init__(self)
def trace_dispatch(self, *args):
# Redirect stdout to the given stream.
save_stdout = sys.stdout
sys.stdout = self.__out
# Call Pdb's trace dispatch method.
try:
return pdb.Pdb.trace_dispatch(self, *args)
finally:
sys.stdout = save_stdout
# [XX] Normalize with respect to os.path.pardir?
def _module_relative_path(module, path):
if not inspect.ismodule(module):
raise TypeError('Expected a module: %r' % module)
if path.startswith('/'):
raise ValueError('Module-relative files may not have absolute paths')
# Find the base directory for the path.
if hasattr(module, '__file__'):
# A normal module/package
basedir = os.path.split(module.__file__)[0]
elif module.__name__ == '__main__':
# An interactive session.
if len(sys.argv)>0 and sys.argv[0] != '':
basedir = os.path.split(sys.argv[0])[0]
else:
basedir = os.curdir
else:
# A module w/o __file__ (this includes builtins)
raise ValueError("Can't resolve paths relative to the module " +
module + " (it has no __file__)")
# Combine the base directory and the path.
return os.path.join(basedir, *(path.split('/')))
######################################################################
## 2. Example & DocTest
######################################################################
## - An "example" is a <source, want> pair, where "source" is a
## fragment of source code, and "want" is the expected output for
## "source." The Example class also includes information about
## where the example was extracted from.
##
## - A "doctest" is a collection of examples, typically extracted from
## a string (such as an object's docstring). The DocTest class also
## includes information about where the string was extracted from.
class Example:
"""
A single doctest example, consisting of source code and expected
output. `Example` defines the following attributes:
- source: A single Python statement, always ending with a newline.
The constructor adds a newline if needed.
- want: The expected output from running the source code (either
from stdout, or a traceback in case of exception). `want` ends
with a newline unless it's empty, in which case it's an empty
string. The constructor adds a newline if needed.
- exc_msg: The exception message generated by the example, if
the example is expected to generate an exception; or `None` if
it is not expected to generate an exception. This exception
message is compared against the return value of
`traceback.format_exception_only()`. `exc_msg` ends with a
newline unless it's `None`. The constructor adds a newline
if needed.
- lineno: The line number within the DocTest string containing
this Example where the Example begins. This line number is
zero-based, with respect to the beginning of the DocTest.
- indent: The example's indentation in the DocTest string.
I.e., the number of space characters that preceed the
example's first prompt.
- options: A dictionary mapping from option flags to True or
False, which is used to override default options for this
example. Any option flags not contained in this dictionary
are left at their default value (as specified by the
DocTestRunner's optionflags). By default, no options are set.
"""
def __init__(self, source, want, exc_msg=None, lineno=0, indent=0,
options=None):
# Normalize inputs.
if not source.endswith('\n'):
source += '\n'
if want and not want.endswith('\n'):
want += '\n'
if exc_msg is not None and not exc_msg.endswith('\n'):
exc_msg += '\n'
# Store properties.
self.source = source
self.want = want
self.lineno = lineno
self.indent = indent
if options is None: options = {}
self.options = options
self.exc_msg = exc_msg
class DocTest:
"""
A collection of doctest examples that should be run in a single
namespace. Each `DocTest` defines the following attributes:
- examples: the list of examples.
- globs: The namespace (aka globals) that the examples should
be run in.
- name: A name identifying the DocTest (typically, the name of
the object whose docstring this DocTest was extracted from).
- filename: The name of the file that this DocTest was extracted
from, or `None` if the filename is unknown.
- lineno: The line number within filename where this DocTest
begins, or `None` if the line number is unavailable. This
line number is zero-based, with respect to the beginning of
the file.
- docstring: The string that the examples were extracted from,
or `None` if the string is unavailable.
"""
def __init__(self, examples, globs, name, filename, lineno, docstring):
"""
Create a new DocTest containing the given examples. The
DocTest's globals are initialized with a copy of `globs`.
"""
assert not isinstance(examples, str), \
"DocTest no longer accepts str; use DocTestParser instead"
self.examples = examples
self.docstring = docstring
self.globs = globs.copy()
self.name = name
self.filename = filename
self.lineno = lineno
def __repr__(self):
if len(self.examples) == 0:
examples = 'no examples'
elif len(self.examples) == 1:
examples = '1 example'
else:
examples = '%d examples' % len(self.examples)
return ('<DocTest %s from %s:%s (%s)>' %
(self.name, self.filename, self.lineno, examples))
# This lets us sort tests by name:
def __cmp__(self, other):
if not isinstance(other, DocTest):
return -1
return cmp((self.name, self.filename, self.lineno, id(self)),
(other.name, other.filename, other.lineno, id(other)))
######################################################################
## 3. DocTestParser
######################################################################
class DocTestParser:
"""
A class used to parse strings containing doctest examples.
"""
# This regular expression is used to find doctest examples in a
# string. It defines three groups: `source` is the source code
# (including leading indentation and prompts); `indent` is the
# indentation of the first (PS1) line of the source code; and
# `want` is the expected output (including leading indentation).
_EXAMPLE_RE = re.compile(r'''
# Source consists of a PS1 line followed by zero or more PS2 lines.
(?P<source>
(?:^(?P<indent> [ ]*) >>> .*) # PS1 line
(?:\n [ ]* \.\.\. .*)*) # PS2 lines
\n?
# Want consists of any non-blank lines that do not start with PS1.
(?P<want> (?:(?![ ]*$) # Not a blank line
(?![ ]*>>>) # Not a line starting with PS1
.*$\n? # But any other line
)*)
''', re.MULTILINE | re.VERBOSE)
# A regular expression for handling `want` strings that contain
# expected exceptions. It divides `want` into three pieces:
# - the traceback header line (`hdr`)
# - the traceback stack (`stack`)
# - the exception message (`msg`), as generated by
# traceback.format_exception_only()
# `msg` may have multiple lines. We assume/require that the
# exception message is the first non-indented line starting with a word
# character following the traceback header line.
_EXCEPTION_RE = re.compile(r"""
# Grab the traceback header. Different versions of Python have
# said different things on the first traceback line.
^(?P<hdr> Traceback\ \(
(?: most\ recent\ call\ last
| innermost\ last
) \) :
)
\s* $ # toss trailing whitespace on the header.
(?P<stack> .*?) # don't blink: absorb stuff until...
^ (?P<msg> \w+ .*) # a line *starts* with alphanum.
""", re.VERBOSE | re.MULTILINE | re.DOTALL)
# A callable returning a true value iff its argument is a blank line
# or contains a single comment.
_IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match
def parse(self, string, name='<string>'):
"""
Divide the given string into examples and intervening text,
and return them as a list of alternating Examples and strings.
Line numbers for the Examples are 0-based. The optional
argument `name` is a name identifying this string, and is only
used for error messages.
"""
string = string.expandtabs()
# If all lines begin with the same indentation, then strip it.
min_indent = self._min_indent(string)
if min_indent > 0:
string = '\n'.join([l[min_indent:] for l in string.split('\n')])
output = []
charno, lineno = 0, 0
# Find all doctest examples in the string:
for m in self._EXAMPLE_RE.finditer(string):
# Add the pre-example text to `output`.
output.append(string[charno:m.start()])
# Update lineno (lines before this example)
lineno += string.count('\n', charno, m.start())
# Extract info from the regexp match.
(source, options, want, exc_msg) = \
self._parse_example(m, name, lineno)
# Create an Example, and add it to the list.
if not self._IS_BLANK_OR_COMMENT(source):
output.append( Example(source, want, exc_msg,
lineno=lineno,
indent=min_indent+len(m.group('indent')),
options=options) )
# Update lineno (lines inside this example)
lineno += string.count('\n', m.start(), m.end())
# Update charno.
charno = m.end()
# Add any remaining post-example text to `output`.
output.append(string[charno:])
return output
def get_doctest(self, string, globs, name, filename, lineno):
"""
Extract all doctest examples from the given string, and
collect them into a `DocTest` object.
`globs`, `name`, `filename`, and `lineno` are attributes for
the new `DocTest` object. See the documentation for `DocTest`
for more information.
"""
return DocTest(self.get_examples(string, name), globs,
name, filename, lineno, string)
def get_examples(self, string, name='<string>'):
"""
Extract all doctest examples from the given string, and return
them as a list of `Example` objects. Line numbers are
0-based, because it's most common in doctests that nothing
interesting appears on the same line as opening triple-quote,
and so the first interesting line is called \"line 1\" then.
The optional argument `name` is a name identifying this
string, and is only used for error messages.
"""
return [x for x in self.parse(string, name)
if isinstance(x, Example)]
def _parse_example(self, m, name, lineno):
"""
Given a regular expression match from `_EXAMPLE_RE` (`m`),
return a pair `(source, want)`, where `source` is the matched
example's source code (with prompts and indentation stripped);
and `want` is the example's expected output (with indentation
stripped).
`name` is the string's name, and `lineno` is the line number
where the example starts; both are used for error messages.
"""
# Get the example's indentation level.
indent = len(m.group('indent'))
# Divide source into lines; check that they're properly
# indented; and then strip their indentation & prompts.
source_lines = m.group('source').split('\n')
self._check_prompt_blank(source_lines, indent, name, lineno)
self._check_prefix(source_lines[1:], ' '*indent + '.', name, lineno)
source = '\n'.join([sl[indent+4:] for sl in source_lines])
# Divide want into lines; check that it's properly indented; and
# then strip the indentation. Spaces before the last newline should
# be preserved, so plain rstrip() isn't good enough.
want = m.group('want')
want_lines = want.split('\n')
if len(want_lines) > 1 and re.match(r' *$', want_lines[-1]):
del want_lines[-1] # forget final newline & spaces after it
self._check_prefix(want_lines, ' '*indent, name,
lineno + len(source_lines))
want = '\n'.join([wl[indent:] for wl in want_lines])
# If `want` contains a traceback message, then extract it.
m = self._EXCEPTION_RE.match(want)
if m:
exc_msg = m.group('msg')
else:
exc_msg = None
# Extract options from the source.
options = self._find_options(source, name, lineno)
return source, options, want, exc_msg
# This regular expression looks for option directives in the
# source code of an example. Option directives are comments
# starting with "doctest:". Warning: this may give false
# positives for string-literals that contain the string
# "#doctest:". Eliminating these false positives would require
# actually parsing the string; but we limit them by ignoring any
# line containing "#doctest:" that is *followed* by a quote mark.
_OPTION_DIRECTIVE_RE = re.compile(r'#\s*doctest:\s*([^\n\'"]*)$',
re.MULTILINE)
def _find_options(self, source, name, lineno):
"""
Return a dictionary containing option overrides extracted from
option directives in the given source string.
`name` is the string's name, and `lineno` is the line number
where the example starts; both are used for error messages.
"""
options = {}
# (note: with the current regexp, this will match at most once:)
for m in self._OPTION_DIRECTIVE_RE.finditer(source):
option_strings = m.group(1).replace(',', ' ').split()
for option in option_strings:
if (option[0] not in '+-' or
option[1:] not in OPTIONFLAGS_BY_NAME):
raise ValueError('line %r of the doctest for %s '
'has an invalid option: %r' %
(lineno+1, name, option))
flag = OPTIONFLAGS_BY_NAME[option[1:]]
options[flag] = (option[0] == '+')
if options and self._IS_BLANK_OR_COMMENT(source):
raise ValueError('line %r of the doctest for %s has an option '
'directive on a line with no example: %r' %
(lineno, name, source))
return options
# This regular expression finds the indentation of every non-blank
# line in a string.
_INDENT_RE = re.compile('^([ ]*)(?=\S)', re.MULTILINE)
def _min_indent(self, s):
"Return the minimum indentation of any non-blank line in `s`"
indents = [len(indent) for indent in self._INDENT_RE.findall(s)]
if len(indents) > 0:
return min(indents)
else:
return 0
def _check_prompt_blank(self, lines, indent, name, lineno):
"""
Given the lines of a source string (including prompts and
leading indentation), check to make sure that every prompt is
followed by a space character. If any line is not followed by
a space character, then raise ValueError.
"""
for i, line in enumerate(lines):
if len(line) >= indent+4 and line[indent+3] != ' ':
raise ValueError('line %r of the docstring for %s '
'lacks blank after %s: %r' %
(lineno+i+1, name,
line[indent:indent+3], line))
def _check_prefix(self, lines, prefix, name, lineno):
"""
Check that every line in the given list starts with the given
prefix; if any line does not, then raise a ValueError.
"""
for i, line in enumerate(lines):
if line and not line.startswith(prefix):
raise ValueError('line %r of the docstring for %s has '
'inconsistent leading whitespace: %r' %
(lineno+i+1, name, line))
######################################################################
## 4. DocTest Finder
######################################################################
class DocTestFinder:
"""
A class used to extract the DocTests that are relevant to a given
object, from its docstring and the docstrings of its contained
objects. Doctests can currently be extracted from the following
object types: modules, functions, classes, methods, staticmethods,
classmethods, and properties.
"""
def __init__(self, verbose=False, parser=DocTestParser(),
recurse=True, _namefilter=None, exclude_empty=True):
"""
Create a new doctest finder.
The optional argument `parser` specifies a class or
function that should be used to create new DocTest objects (or
objects that implement the same interface as DocTest). The
signature for this factory function should match the signature
of the DocTest constructor.
If the optional argument `recurse` is false, then `find` will
only examine the given object, and not any contained objects.
If the optional argument `exclude_empty` is false, then `find`
will include tests for objects with empty docstrings.
"""
self._parser = parser
self._verbose = verbose
self._recurse = recurse
self._exclude_empty = exclude_empty
# _namefilter is undocumented, and exists only for temporary backward-
# compatibility support of testmod's deprecated isprivate mess.
self._namefilter = _namefilter
def find(self, obj, name=None, module=None, globs=None,
extraglobs=None):
"""
Return a list of the DocTests that are defined by the given
object's docstring, or by any of its contained objects'
docstrings.
The optional parameter `module` is the module that contains
the given object. If the module is not specified or is None, then
the test finder will attempt to automatically determine the
correct module. The object's module is used:
- As a default namespace, if `globs` is not specified.
- To prevent the DocTestFinder from extracting DocTests
from objects that are imported from other modules.
- To find the name of the file containing the object.
- To help find the line number of the object within its
file.
Contained objects whose module does not match `module` are ignored.
If `module` is False, no attempt to find the module will be made.
This is obscure, of use mostly in tests: if `module` is False, or
is None but cannot be found automatically, then all objects are
considered to belong to the (non-existent) module, so all contained
objects will (recursively) be searched for doctests.
The globals for each DocTest is formed by combining `globs`
and `extraglobs` (bindings in `extraglobs` override bindings
in `globs`). A new copy of the globals dictionary is created
for each DocTest. If `globs` is not specified, then it
defaults to the module's `__dict__`, if specified, or {}
otherwise. If `extraglobs` is not specified, then it defaults
to {}.
"""
# If name was not specified, then extract it from the object.
if name is None:
name = getattr(obj, '__name__', None)
if name is None:
raise ValueError("DocTestFinder.find: name must be given "
"when obj.__name__ doesn't exist: %r" %
(type(obj),))
# Find the module that contains the given object (if obj is
# a module, then module=obj.). Note: this may fail, in which
# case module will be None.
if module is False:
module = None
elif module is None:
module = inspect.getmodule(obj)
# Read the module's source code. This is used by
# DocTestFinder._find_lineno to find the line number for a
# given object's docstring.
try:
file = inspect.getsourcefile(obj) or inspect.getfile(obj)
source_lines = linecache.getlines(file)
if not source_lines:
source_lines = None
except TypeError:
source_lines = None
# Initialize globals, and merge in extraglobs.
if globs is None:
if module is None:
globs = {}
else:
globs = module.__dict__.copy()
else:
globs = globs.copy()
if extraglobs is not None:
globs.update(extraglobs)
# Recursively expore `obj`, extracting DocTests.
tests = []
self._find(tests, obj, name, module, source_lines, globs, {})
# Sort the tests by alpha order of names, for consistency in
# verbose-mode output. This was a feature of doctest in Pythons
# <= 2.3 that got lost by accident in 2.4. It was repaired in
# 2.4.4 and 2.5.
tests.sort()
return tests
def _filter(self, obj, prefix, base):
"""
Return true if the given object should not be examined.
"""
return (self._namefilter is not None and
self._namefilter(prefix, base))
def _from_module(self, module, object):
"""
Return true if the given object is defined in the given
module.
"""
if module is None:
return True
elif inspect.isfunction(object):
return module.__dict__ is object.__globals__
elif inspect.isclass(object):
# Some jython classes don't set __module__
return module.__name__ == getattr(object, '__module__', None)
elif inspect.getmodule(object) is not None:
return module is inspect.getmodule(object)
elif hasattr(object, '__module__'):
return module.__name__ == object.__module__
elif isinstance(object, property):
return True # [XX] no way not be sure.
else:
raise ValueError("object must be a class or function")
def _find(self, tests, obj, name, module, source_lines, globs, seen):
"""
Find tests for the given object and any contained objects, and
add them to `tests`.
"""
if self._verbose:
print('Finding tests in %s' % name)
# If we've already processed this object, then ignore it.
if id(obj) in seen:
return
seen[id(obj)] = 1
# Find a test for this object, and add it to the list of tests.
test = self._get_test(obj, name, module, globs, source_lines)
if test is not None:
tests.append(test)
# Look for tests in a module's contained objects.
if inspect.ismodule(obj) and self._recurse:
for valname, val in list(obj.__dict__.items()):
# Check if this contained object should be ignored.
if self._filter(val, name, valname):
continue
valname = '%s.%s' % (name, valname)
# Recurse to functions & classes.
if ((inspect.isfunction(val) or inspect.isclass(val)) and
self._from_module(module, val)):
self._find(tests, val, valname, module, source_lines,
globs, seen)
# Look for tests in a module's __test__ dictionary.
if inspect.ismodule(obj) and self._recurse:
for valname, val in list(getattr(obj, '__test__', {}).items()):
if not isinstance(valname, str):
raise ValueError("DocTestFinder.find: __test__ keys "
"must be strings: %r" %
(type(valname),))
if not (inspect.isfunction(val) or inspect.isclass(val) or
inspect.ismethod(val) or inspect.ismodule(val) or
isinstance(val, str)):
raise ValueError("DocTestFinder.find: __test__ values "
"must be strings, functions, methods, "
"classes, or modules: %r" %
(type(val),))
valname = '%s.__test__.%s' % (name, valname)
self._find(tests, val, valname, module, source_lines,
globs, seen)
# Look for tests in a class's contained objects.
if inspect.isclass(obj) and self._recurse:
for valname, val in list(obj.__dict__.items()):
# Check if this contained object should be ignored.
if self._filter(val, name, valname):
continue
# Special handling for staticmethod/classmethod.
if isinstance(val, staticmethod):
val = getattr(obj, valname)
if isinstance(val, classmethod):
val = getattr(obj, valname).__func__
# Recurse to methods, properties, and nested classes.
if ((inspect.isfunction(val) or inspect.isclass(val) or
isinstance(val, property)) and
self._from_module(module, val)):
valname = '%s.%s' % (name, valname)
self._find(tests, val, valname, module, source_lines,
globs, seen)
def _get_test(self, obj, name, module, globs, source_lines):
"""
Return a DocTest for the given object, if it defines a docstring;
otherwise, return None.
"""
# Extract the object's docstring. If it doesn't have one,
# then return None (no test for this object).
if isinstance(obj, str):
docstring = obj
else:
try:
if obj.__doc__ is None:
docstring = ''
else:
docstring = obj.__doc__
if not isinstance(docstring, str):
docstring = str(docstring)
except (TypeError, AttributeError):
docstring = ''
# Find the docstring's location in the file.
lineno = self._find_lineno(obj, source_lines)
# Don't bother if the docstring is empty.
if self._exclude_empty and not docstring:
return None
# Return a DocTest for this object.
if module is None:
filename = None
else:
filename = getattr(module, '__file__', module.__name__)
if filename[-4:] in (".pyc", ".pyo"):
filename = filename[:-1]
elif sys.platform.startswith('java') and \
filename.endswith('$py.class'):
filename = '%s.py' % filename[:-9]
return self._parser.get_doctest(docstring, globs, name,
filename, lineno)
def _find_lineno(self, obj, source_lines):
"""
Return a line number of the given object's docstring. Note:
this method assumes that the object has a docstring.
"""
lineno = None
# Find the line number for modules.
if inspect.ismodule(obj):
lineno = 0
# Find the line number for classes.
# Note: this could be fooled if a class is defined multiple
# times in a single file.
if inspect.isclass(obj):
if source_lines is None:
return None
pat = re.compile(r'^\s*class\s*%s\b' %
getattr(obj, '__name__', '-'))
for i, line in enumerate(source_lines):
if pat.match(line):
lineno = i
break
# Find the line number for functions & methods.
if inspect.ismethod(obj): obj = obj.__func__
if inspect.isfunction(obj): obj = obj.__code__
if inspect.istraceback(obj): obj = obj.tb_frame
if inspect.isframe(obj): obj = obj.f_code
if inspect.iscode(obj):
lineno = getattr(obj, 'co_firstlineno', None)-1
# Find the line number where the docstring starts. Assume
# that it's the first line that begins with a quote mark.
# Note: this could be fooled by a multiline function
# signature, where a continuation line begins with a quote
# mark.
if lineno is not None:
if source_lines is None:
return lineno+1
pat = re.compile('(^|.*:)\s*\w*("|\')')
for lineno in range(lineno, len(source_lines)):
if pat.match(source_lines[lineno]):
return lineno
# We couldn't find the line number.
return None
######################################################################
## 5. DocTest Runner
######################################################################
class DocTestRunner:
# This divider string is used to separate failure messages, and to
# separate sections of the summary.
DIVIDER = "*" * 70
def __init__(self, checker=None, verbose=None, optionflags=0):
"""
Create a new test runner.
Optional keyword arg `checker` is the `OutputChecker` that
should be used to compare the expected outputs and actual
outputs of doctest examples.
Optional keyword arg 'verbose' prints lots of stuff if true,
only failures if false; by default, it's true iff '-v' is in
sys.argv.
Optional argument `optionflags` can be used to control how the
test runner compares expected output to actual output, and how
it displays failures. See the documentation for `testmod` for
more information.
"""
self._checker = checker or OutputChecker()
if verbose is None:
verbose = '-v' in sys.argv
self._verbose = verbose
self.optionflags = optionflags
self.original_optionflags = optionflags
# Keep track of the examples we've run.
self.tries = 0
self.failures = 0
self._name2ft = {}
# Create a fake output target for capturing doctest output.
self._fakeout = _SpoofOut()
#/////////////////////////////////////////////////////////////////
# Reporting methods
#/////////////////////////////////////////////////////////////////
def report_start(self, out, test, example):
"""
Report that the test runner is about to process the given
example. (Only displays a message if verbose=True)
"""
if self._verbose:
if example.want:
out('Trying:\n' + _indent(example.source) +
'Expecting:\n' + _indent(example.want))
else:
out('Trying:\n' + _indent(example.source) +
'Expecting nothing\n')
def report_success(self, out, test, example, got):
"""
Report that the given example ran successfully. (Only
displays a message if verbose=True)
"""
if self._verbose:
out("ok\n")
def report_failure(self, out, test, example, got):
"""
Report that the given example failed.
"""
out(self._failure_header(test, example) +
self._checker.output_difference(example, got, self.optionflags))
def report_unexpected_exception(self, out, test, example, exc_info):
"""
Report that the given example raised an unexpected exception.
"""
out(self._failure_header(test, example) +
'Exception raised:\n' + _indent(_exception_traceback(exc_info)))
def _failure_header(self, test, example):
out = [self.DIVIDER]
if test.filename:
if test.lineno is not None and example.lineno is not None:
lineno = test.lineno + example.lineno + 1
else:
lineno = '?'
out.append('File "%s", line %s, in %s' %
(test.filename, lineno, test.name))
else:
out.append('Line %s, in %s' % (example.lineno+1, test.name))
out.append('Failed example:')
source = example.source
out.append(_indent(source))
return '\n'.join(out)
#/////////////////////////////////////////////////////////////////
# DocTest Running
#/////////////////////////////////////////////////////////////////
def __run(self, test, compileflags, out):
"""
Run the examples in `test`. Write the outcome of each example
with one of the `DocTestRunner.report_*` methods, using the
writer function `out`. `compileflags` is the set of compiler
flags that should be used to execute examples. Return a tuple
`(f, t)`, where `t` is the number of examples tried, and `f`
is the number of examples that failed. The examples are run
in the namespace `test.globs`.
"""
# Keep track of the number of failures and tries.
failures = tries = 0
# Save the option flags (since option directives can be used
# to modify them).
original_optionflags = self.optionflags
SUCCESS, FAILURE, BOOM = list(range(3)) # `outcome` state
check = self._checker.check_output
# Process each example.
for examplenum, example in enumerate(test.examples):
# If REPORT_ONLY_FIRST_FAILURE is set, then supress
# reporting after the first failure.
quiet = (self.optionflags & REPORT_ONLY_FIRST_FAILURE and
failures > 0)
# Merge in the example's options.
self.optionflags = original_optionflags
if example.options:
for (optionflag, val) in list(example.options.items()):
if val:
self.optionflags |= optionflag
else:
self.optionflags &= ~optionflag
# Record that we started this example.
tries += 1
if not quiet:
self.report_start(out, test, example)
# Use a special filename for compile(), so we can retrieve
# the source code during interactive debugging (see
# __patched_linecache_getlines).
filename = '<doctest %s[%d]>' % (test.name, examplenum)
# Run the example in the given context (globs), and record
# any exception that gets raised. (But don't intercept
# keyboard interrupts.)
try:
# Don't blink! This is where the user's code gets run.
exec(compile(example.source, filename, "single",
compileflags, 1), test.globs)
self.debugger.set_continue() # ==== Example Finished ====
exception = None
except KeyboardInterrupt:
raise
except:
exception = sys.exc_info()
self.debugger.set_continue() # ==== Example Finished ====
got = self._fakeout.getvalue() # the actual output
self._fakeout.truncate(0)
outcome = FAILURE # guilty until proved innocent or insane
# If the example executed without raising any exceptions,
# verify its output.
if exception is None:
if check(example.want, got, self.optionflags):
outcome = SUCCESS
# The example raised an exception: check if it was expected.
else:
exc_info = sys.exc_info()
exc_msg = traceback.format_exception_only(*exc_info[:2])[-1]
if not quiet:
got += _exception_traceback(exc_info)
# If `example.exc_msg` is None, then we weren't expecting
# an exception.
if example.exc_msg is None:
outcome = BOOM
# We expected an exception: see whether it matches.
elif check(example.exc_msg, exc_msg, self.optionflags):
outcome = SUCCESS
# Another chance if they didn't care about the detail.
elif self.optionflags & IGNORE_EXCEPTION_DETAIL:
m1 = re.match(r'[^:]*:', example.exc_msg)
m2 = re.match(r'[^:]*:', exc_msg)
if m1 and m2 and check(m1.group(0), m2.group(0),
self.optionflags):
outcome = SUCCESS
# Report the outcome.
if outcome is SUCCESS:
if not quiet:
self.report_success(out, test, example, got)
elif outcome is FAILURE:
if not quiet:
self.report_failure(out, test, example, got)
failures += 1
elif outcome is BOOM:
if not quiet:
self.report_unexpected_exception(out, test, example,
exc_info)
failures += 1
else:
assert False, ("unknown outcome", outcome)
# Restore the option flags (in case they were modified)
self.optionflags = original_optionflags
# Record and return the number of failures and tries.
self.__record_outcome(test, failures, tries)
return failures, tries
def __record_outcome(self, test, f, t):
"""
Record the fact that the given DocTest (`test`) generated `f`
failures out of `t` tried examples.
"""
f2, t2 = self._name2ft.get(test.name, (0,0))
self._name2ft[test.name] = (f+f2, t+t2)
self.failures += f
self.tries += t
__LINECACHE_FILENAME_RE = re.compile(r'<doctest '
r'(?P<name>[\w\.]+)'
r'\[(?P<examplenum>\d+)\]>$')
def __patched_linecache_getlines(self, filename):
m = self.__LINECACHE_FILENAME_RE.match(filename)
if m and m.group('name') == self.test.name:
example = self.test.examples[int(m.group('examplenum'))]
return example.source.splitlines(True)
else:
return self.save_linecache_getlines(filename)
def run(self, test, compileflags=None, out=None, clear_globs=True):
"""
Run the examples in `test`, and display the results using the
writer function `out`.
The examples are run in the namespace `test.globs`. If
`clear_globs` is true (the default), then this namespace will
be cleared after the test runs, to help with garbage
collection. If you would like to examine the namespace after
the test completes, then use `clear_globs=False`.
`compileflags` gives the set of flags that should be used by
the Python compiler when running the examples. If not
specified, then it will default to the set of future-import
flags that apply to `globs`.
The output of each example is checked using
`DocTestRunner.check_output`, and the results are formatted by
the `DocTestRunner.report_*` methods.
"""
self.test = test
if compileflags is None:
compileflags = _extract_future_flags(test.globs)
save_stdout = sys.stdout
if out is None:
out = save_stdout.write
sys.stdout = self._fakeout
# Patch pdb.set_trace to restore sys.stdout during interactive
# debugging (so it's not still redirected to self._fakeout).
# Note that the interactive output will go to *our*
# save_stdout, even if that's not the real sys.stdout; this
# allows us to write test cases for the set_trace behavior.
save_set_trace = pdb.set_trace
self.debugger = _OutputRedirectingPdb(save_stdout)
self.debugger.reset()
pdb.set_trace = self.debugger.set_trace
# Patch linecache.getlines, so we can see the example's source
# when we're inside the debugger.
self.save_linecache_getlines = linecache.getlines
linecache.getlines = self.__patched_linecache_getlines
try:
return self.__run(test, compileflags, out)
finally:
sys.stdout = save_stdout
pdb.set_trace = save_set_trace
linecache.getlines = self.save_linecache_getlines
if clear_globs:
test.globs.clear()
#/////////////////////////////////////////////////////////////////
# Summarization
#/////////////////////////////////////////////////////////////////
def summarize(self, verbose=None):
"""
Print a summary of all the test cases that have been run by
this DocTestRunner, and return a tuple `(f, t)`, where `f` is
the total number of failed examples, and `t` is the total
number of tried examples.
The optional `verbose` argument controls how detailed the
summary is. If the verbosity is not specified, then the
DocTestRunner's verbosity is used.
"""
if verbose is None:
verbose = self._verbose
notests = []
passed = []
failed = []
totalt = totalf = 0
for x in list(self._name2ft.items()):
name, (f, t) = x
assert f <= t
totalt += t
totalf += f
if t == 0:
notests.append(name)
elif f == 0:
passed.append( (name, t) )
else:
failed.append(x)
if verbose:
if notests:
print(len(notests), "items had no tests:")
notests.sort()
for thing in notests:
print(" ", thing)
if passed:
print(len(passed), "items passed all tests:")
passed.sort()
for thing, count in passed:
print(" %3d tests in %s" % (count, thing))
if failed:
print(self.DIVIDER)
print(len(failed), "items had failures:")
failed.sort()
for thing, (f, t) in failed:
print(" %3d of %3d in %s" % (f, t, thing))
if verbose:
print(totalt, "tests in", len(self._name2ft), "items.")
print(totalt - totalf, "passed and", totalf, "failed.")
if totalf:
print("***Test Failed***", totalf, "failures.")
elif verbose:
print("Test passed.")
return totalf, totalt
#/////////////////////////////////////////////////////////////////
# Backward compatibility cruft to maintain doctest.master.
#/////////////////////////////////////////////////////////////////
def merge(self, other):
d = self._name2ft
for name, (f, t) in list(other._name2ft.items()):
if name in d:
print("*** DocTestRunner.merge: '" + name + "' in both" \
" testers; summing outcomes.")
f2, t2 = d[name]
f = f + f2
t = t + t2
d[name] = f, t
class OutputChecker:
"""
A class used to check the whether the actual output from a doctest
example matches the expected output. `OutputChecker` defines two
methods: `check_output`, which compares a given pair of outputs,
and returns true if they match; and `output_difference`, which
returns a string describing the differences between two outputs.
"""
def check_output(self, want, got, optionflags):
"""
Return True iff the actual output from an example (`got`)
matches the expected output (`want`). These strings are
always considered to match if they are identical; but
depending on what option flags the test runner is using,
several non-exact match types are also possible. See the
documentation for `TestRunner` for more information about
option flags.
"""
# Handle the common case first, for efficiency:
# if they're string-identical, always return true.
if got == want:
return True
# The values True and False replaced 1 and 0 as the return
# value for boolean comparisons in Python 2.3.
if not (optionflags & DONT_ACCEPT_TRUE_FOR_1):
if (got,want) == ("True\n", "1\n"):
return True
if (got,want) == ("False\n", "0\n"):
return True
# <BLANKLINE> can be used as a special sequence to signify a
# blank line, unless the DONT_ACCEPT_BLANKLINE flag is used.
if not (optionflags & DONT_ACCEPT_BLANKLINE):
# Replace <BLANKLINE> in want with a blank line.
want = re.sub('(?m)^%s\s*?$' % re.escape(BLANKLINE_MARKER),
'', want)
# If a line in got contains only spaces, then remove the
# spaces.
got = re.sub('(?m)^\s*?$', '', got)
if got == want:
return True
# This flag causes doctest to ignore any differences in the
# contents of whitespace strings. Note that this can be used
# in conjunction with the ELLIPSIS flag.
if optionflags & NORMALIZE_WHITESPACE:
got = ' '.join(got.split())
want = ' '.join(want.split())
if got == want:
return True
# The ELLIPSIS flag says to let the sequence "..." in `want`
# match any substring in `got`.
if optionflags & ELLIPSIS:
if _ellipsis_match(want, got):
return True
# We didn't find any match; return false.
return False
# Should we do a fancy diff?
def _do_a_fancy_diff(self, want, got, optionflags):
# Not unless they asked for a fancy diff.
if not optionflags & (REPORT_UDIFF |
REPORT_CDIFF |
REPORT_NDIFF):
return False
# If expected output uses ellipsis, a meaningful fancy diff is
# too hard ... or maybe not. In two real-life failures Tim saw,
# a diff was a major help anyway, so this is commented out.
# [todo] _ellipsis_match() knows which pieces do and don't match,
# and could be the basis for a kick-ass diff in this case.
##if optionflags & ELLIPSIS and ELLIPSIS_MARKER in want:
## return False
# ndiff does intraline difference marking, so can be useful even
# for 1-line differences.
if optionflags & REPORT_NDIFF:
return True
# The other diff types need at least a few lines to be helpful.
return want.count('\n') > 2 and got.count('\n') > 2
def output_difference(self, example, got, optionflags):
"""
Return a string describing the differences between the
expected output for a given example (`example`) and the actual
output (`got`). `optionflags` is the set of option flags used
to compare `want` and `got`.
"""
want = example.want
# If <BLANKLINE>s are being used, then replace blank lines
# with <BLANKLINE> in the actual output string.
if not (optionflags & DONT_ACCEPT_BLANKLINE):
got = re.sub('(?m)^[ ]*(?=\n)', BLANKLINE_MARKER, got)
# Check if we should use diff.
if self._do_a_fancy_diff(want, got, optionflags):
# Split want & got into lines.
want_lines = want.splitlines(True) # True == keep line ends
got_lines = got.splitlines(True)
# Use difflib to find their differences.
if optionflags & REPORT_UDIFF:
diff = difflib.unified_diff(want_lines, got_lines, n=2)
diff = list(diff)[2:] # strip the diff header
kind = 'unified diff with -expected +actual'
elif optionflags & REPORT_CDIFF:
diff = difflib.context_diff(want_lines, got_lines, n=2)
diff = list(diff)[2:] # strip the diff header
kind = 'context diff with expected followed by actual'
elif optionflags & REPORT_NDIFF:
engine = difflib.Differ(charjunk=difflib.IS_CHARACTER_JUNK)
diff = list(engine.compare(want_lines, got_lines))
kind = 'ndiff with -expected +actual'
else:
assert 0, 'Bad diff option'
# Remove trailing whitespace on diff output.
diff = [line.rstrip() + '\n' for line in diff]
return 'Differences (%s):\n' % kind + _indent(''.join(diff))
# If we're not using diff, then simply list the expected
# output followed by the actual output.
if want and got:
return 'Expected:\n%sGot:\n%s' % (_indent(want), _indent(got))
elif want:
return 'Expected:\n%sGot nothing\n' % _indent(want)
elif got:
return 'Expected nothing\nGot:\n%s' % _indent(got)
else:
return 'Expected nothing\nGot nothing\n'
class DocTestFailure(Exception):
"""A DocTest example has failed in debugging mode.
The exception instance has variables:
- test: the DocTest object being run
- excample: the Example object that failed
- got: the actual output
"""
def __init__(self, test, example, got):
self.test = test
self.example = example
self.got = got
def __str__(self):
return str(self.test)
class UnexpectedException(Exception):
"""A DocTest example has encountered an unexpected exception
The exception instance has variables:
- test: the DocTest object being run
- excample: the Example object that failed
- exc_info: the exception info
"""
def __init__(self, test, example, exc_info):
self.test = test
self.example = example
self.exc_info = exc_info
def __str__(self):
return str(self.test)
class DebugRunner(DocTestRunner):
def run(self, test, compileflags=None, out=None, clear_globs=True):
r = DocTestRunner.run(self, test, compileflags, out, False)
if clear_globs:
test.globs.clear()
return r
def report_unexpected_exception(self, out, test, example, exc_info):
raise UnexpectedException(test, example, exc_info)
def report_failure(self, out, test, example, got):
raise DocTestFailure(test, example, got)
######################################################################
## 6. Test Functions
######################################################################
# These should be backwards compatible.
# For backward compatibility, a global instance of a DocTestRunner
# class, updated by testmod.
master = None
def testmod(m=None, name=None, globs=None, verbose=None, isprivate=None,
report=True, optionflags=0, extraglobs=None,
raise_on_error=False, exclude_empty=False):
"""m=None, name=None, globs=None, verbose=None, isprivate=None,
report=True, optionflags=0, extraglobs=None, raise_on_error=False,
exclude_empty=False
Test examples in docstrings in functions and classes reachable
from module m (or the current module if m is not supplied), starting
with m.__doc__. Unless isprivate is specified, private names
are not skipped.
Also test examples reachable from dict m.__test__ if it exists and is
not None. m.__test__ maps names to functions, classes and strings;
function and class docstrings are tested even if the name is private;
strings are tested directly, as if they were docstrings.
Return (#failures, #tests).
See doctest.__doc__ for an overview.
Optional keyword arg "name" gives the name of the module; by default
use m.__name__.
Optional keyword arg "globs" gives a dict to be used as the globals
when executing examples; by default, use m.__dict__. A copy of this
dict is actually used for each docstring, so that each docstring's
examples start with a clean slate.
Optional keyword arg "extraglobs" gives a dictionary that should be
merged into the globals that are used to execute examples. By
default, no extra globals are used. This is new in 2.4.
Optional keyword arg "verbose" prints lots of stuff if true, prints
only failures if false; by default, it's true iff "-v" is in sys.argv.
Optional keyword arg "report" prints a summary at the end when true,
else prints nothing at the end. In verbose mode, the summary is
detailed, else very brief (in fact, empty if all tests passed).
Optional keyword arg "optionflags" or's together module constants,
and defaults to 0. This is new in 2.3. Possible values (see the
docs for details):
DONT_ACCEPT_TRUE_FOR_1
DONT_ACCEPT_BLANKLINE
NORMALIZE_WHITESPACE
ELLIPSIS
IGNORE_EXCEPTION_DETAIL
REPORT_UDIFF
REPORT_CDIFF
REPORT_NDIFF
REPORT_ONLY_FIRST_FAILURE
Optional keyword arg "raise_on_error" raises an exception on the
first unexpected exception or failure. This allows failures to be
post-mortem debugged.
Deprecated in Python 2.4:
Optional keyword arg "isprivate" specifies a function used to
determine whether a name is private. The default function is
treat all functions as public. Optionally, "isprivate" can be
set to doctest.is_private to skip over functions marked as private
using the underscore naming convention; see its docs for details.
Advanced tomfoolery: testmod runs methods of a local instance of
class doctest.Tester, then merges the results into (or creates)
global Tester instance doctest.master. Methods of doctest.master
can be called directly too, if you want to do something unusual.
Passing report=0 to testmod is especially useful then, to delay
displaying a summary. Invoke doctest.master.summarize(verbose)
when you're done fiddling.
"""
global master
if isprivate is not None:
warnings.warn("the isprivate argument is deprecated; "
"examine DocTestFinder.find() lists instead",
DeprecationWarning)
# If no module was given, then use __main__.
if m is None:
# DWA - m will still be None if this wasn't invoked from the command
# line, in which case the following TypeError is about as good an error
# as we should expect
m = sys.modules.get('__main__')
# Check that we were actually given a module.
if not inspect.ismodule(m):
raise TypeError("testmod: module required; %r" % (m,))
# If no name was given, then use the module's name.
if name is None:
name = m.__name__
# Find, parse, and run all tests in the given module.
finder = DocTestFinder(_namefilter=isprivate, exclude_empty=exclude_empty)
if raise_on_error:
runner = DebugRunner(verbose=verbose, optionflags=optionflags)
else:
runner = DocTestRunner(verbose=verbose, optionflags=optionflags)
for test in finder.find(m, name, globs=globs, extraglobs=extraglobs):
runner.run(test)
if report:
runner.summarize()
if master is None:
master = runner
else:
master.merge(runner)
return runner.failures, runner.tries
def testfile(filename, module_relative=True, name=None, package=None,
globs=None, verbose=None, report=True, optionflags=0,
extraglobs=None, raise_on_error=False, parser=DocTestParser()):
"""
Test examples in the given file. Return (#failures, #tests).
Optional keyword arg "module_relative" specifies how filenames
should be interpreted:
- If "module_relative" is True (the default), then "filename"
specifies a module-relative path. By default, this path is
relative to the calling module's directory; but if the
"package" argument is specified, then it is relative to that
package. To ensure os-independence, "filename" should use
"/" characters to separate path segments, and should not
be an absolute path (i.e., it may not begin with "/").
- If "module_relative" is False, then "filename" specifies an
os-specific path. The path may be absolute or relative (to
the current working directory).
Optional keyword arg "name" gives the name of the test; by default
use the file's basename.
Optional keyword argument "package" is a Python package or the
name of a Python package whose directory should be used as the
base directory for a module relative filename. If no package is
specified, then the calling module's directory is used as the base
directory for module relative filenames. It is an error to
specify "package" if "module_relative" is False.
Optional keyword arg "globs" gives a dict to be used as the globals
when executing examples; by default, use {}. A copy of this dict
is actually used for each docstring, so that each docstring's
examples start with a clean slate.
Optional keyword arg "extraglobs" gives a dictionary that should be
merged into the globals that are used to execute examples. By
default, no extra globals are used.
Optional keyword arg "verbose" prints lots of stuff if true, prints
only failures if false; by default, it's true iff "-v" is in sys.argv.
Optional keyword arg "report" prints a summary at the end when true,
else prints nothing at the end. In verbose mode, the summary is
detailed, else very brief (in fact, empty if all tests passed).
Optional keyword arg "optionflags" or's together module constants,
and defaults to 0. Possible values (see the docs for details):
DONT_ACCEPT_TRUE_FOR_1
DONT_ACCEPT_BLANKLINE
NORMALIZE_WHITESPACE
ELLIPSIS
IGNORE_EXCEPTION_DETAIL
REPORT_UDIFF
REPORT_CDIFF
REPORT_NDIFF
REPORT_ONLY_FIRST_FAILURE
Optional keyword arg "raise_on_error" raises an exception on the
first unexpected exception or failure. This allows failures to be
post-mortem debugged.
Optional keyword arg "parser" specifies a DocTestParser (or
subclass) that should be used to extract tests from the files.
Advanced tomfoolery: testmod runs methods of a local instance of
class doctest.Tester, then merges the results into (or creates)
global Tester instance doctest.master. Methods of doctest.master
can be called directly too, if you want to do something unusual.
Passing report=0 to testmod is especially useful then, to delay
displaying a summary. Invoke doctest.master.summarize(verbose)
when you're done fiddling.
"""
global master
if package and not module_relative:
raise ValueError("Package may only be specified for module-"
"relative paths.")
# Relativize the path
if module_relative:
package = _normalize_module(package)
filename = _module_relative_path(package, filename)
# If no name was given, then use the file's name.
if name is None:
name = os.path.basename(filename)
# Assemble the globals.
if globs is None:
globs = {}
else:
globs = globs.copy()
if extraglobs is not None:
globs.update(extraglobs)
if raise_on_error:
runner = DebugRunner(verbose=verbose, optionflags=optionflags)
else:
runner = DocTestRunner(verbose=verbose, optionflags=optionflags)
# Read the file, convert it to a test, and run it.
s = open(filename).read()
test = parser.get_doctest(s, globs, name, filename, 0)
runner.run(test)
if report:
runner.summarize()
if master is None:
master = runner
else:
master.merge(runner)
return runner.failures, runner.tries
def run_docstring_examples(f, globs, verbose=False, name="NoName",
compileflags=None, optionflags=0):
"""
Test examples in the given object's docstring (`f`), using `globs`
as globals. Optional argument `name` is used in failure messages.
If the optional argument `verbose` is true, then generate output
even if there are no failures.
`compileflags` gives the set of flags that should be used by the
Python compiler when running the examples. If not specified, then
it will default to the set of future-import flags that apply to
`globs`.
Optional keyword arg `optionflags` specifies options for the
testing and output. See the documentation for `testmod` for more
information.
"""
# Find, parse, and run all tests in the given module.
finder = DocTestFinder(verbose=verbose, recurse=False)
runner = DocTestRunner(verbose=verbose, optionflags=optionflags)
for test in finder.find(f, name, globs=globs):
runner.run(test, compileflags=compileflags)
######################################################################
## 7. Tester
######################################################################
# This is provided only for backwards compatibility. It's not
# actually used in any way.
class Tester:
def __init__(self, mod=None, globs=None, verbose=None,
isprivate=None, optionflags=0):
warnings.warn("class Tester is deprecated; "
"use class doctest.DocTestRunner instead",
DeprecationWarning, stacklevel=2)
if mod is None and globs is None:
raise TypeError("Tester.__init__: must specify mod or globs")
if mod is not None and not inspect.ismodule(mod):
raise TypeError("Tester.__init__: mod must be a module; %r" %
(mod,))
if globs is None:
globs = mod.__dict__
self.globs = globs
self.verbose = verbose
self.isprivate = isprivate
self.optionflags = optionflags
self.testfinder = DocTestFinder(_namefilter=isprivate)
self.testrunner = DocTestRunner(verbose=verbose,
optionflags=optionflags)
def runstring(self, s, name):
test = DocTestParser().get_doctest(s, self.globs, name, None, None)
if self.verbose:
print("Running string", name)
(f,t) = self.testrunner.run(test)
if self.verbose:
print(f, "of", t, "examples failed in string", name)
return (f,t)
def rundoc(self, object, name=None, module=None):
f = t = 0
tests = self.testfinder.find(object, name, module=module,
globs=self.globs)
for test in tests:
(f2, t2) = self.testrunner.run(test)
(f,t) = (f+f2, t+t2)
return (f,t)
def rundict(self, d, name, module=None):
import new
m = new.module(name)
m.__dict__.update(d)
if module is None:
module = False
return self.rundoc(m, name, module)
def run__test__(self, d, name):
import new
m = new.module(name)
m.__test__ = d
return self.rundoc(m, name)
def summarize(self, verbose=None):
return self.testrunner.summarize(verbose)
def merge(self, other):
self.testrunner.merge(other.testrunner)
######################################################################
## 8. Unittest Support
######################################################################
_unittest_reportflags = 0
def set_unittest_reportflags(flags):
global _unittest_reportflags
if (flags & REPORTING_FLAGS) != flags:
raise ValueError("Only reporting flags allowed", flags)
old = _unittest_reportflags
_unittest_reportflags = flags
return old
class DocTestCase(unittest.TestCase):
def __init__(self, test, optionflags=0, setUp=None, tearDown=None,
checker=None):
unittest.TestCase.__init__(self)
self._dt_optionflags = optionflags
self._dt_checker = checker
self._dt_test = test
self._dt_setUp = setUp
self._dt_tearDown = tearDown
def setUp(self):
test = self._dt_test
if self._dt_setUp is not None:
self._dt_setUp(test)
def tearDown(self):
test = self._dt_test
if self._dt_tearDown is not None:
self._dt_tearDown(test)
test.globs.clear()
def runTest(self):
test = self._dt_test
old = sys.stdout
new = StringIO()
optionflags = self._dt_optionflags
if not (optionflags & REPORTING_FLAGS):
# The option flags don't include any reporting flags,
# so add the default reporting flags
optionflags |= _unittest_reportflags
runner = DocTestRunner(optionflags=optionflags,
checker=self._dt_checker, verbose=False)
try:
runner.DIVIDER = "-"*70
failures, tries = runner.run(
test, out=new.write, clear_globs=False)
finally:
sys.stdout = old
if failures:
raise self.failureException(self.format_failure(new.getvalue()))
def format_failure(self, err):
test = self._dt_test
if test.lineno is None:
lineno = 'unknown line number'
else:
lineno = '%s' % test.lineno
lname = '.'.join(test.name.split('.')[-1:])
return ('Failed doctest test for %s\n'
' File "%s", line %s, in %s\n\n%s'
% (test.name, test.filename, lineno, lname, err)
)
def debug(self):
self.setUp()
runner = DebugRunner(optionflags=self._dt_optionflags,
checker=self._dt_checker, verbose=False)
runner.run(self._dt_test)
self.tearDown()
def id(self):
return self._dt_test.name
def __repr__(self):
name = self._dt_test.name.split('.')
return "%s (%s)" % (name[-1], '.'.join(name[:-1]))
__str__ = __repr__
def shortDescription(self):
return "Doctest: " + self._dt_test.name
def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,
**options):
"""
Convert doctest tests for a module to a unittest test suite.
This converts each documentation string in a module that
contains doctest tests to a unittest test case. If any of the
tests in a doc string fail, then the test case fails. An exception
is raised showing the name of the file containing the test and a
(sometimes approximate) line number.
The `module` argument provides the module to be tested. The argument
can be either a module or a module name.
If no argument is given, the calling module is used.
A number of options may be provided as keyword arguments:
setUp
A set-up function. This is called before running the
tests in each file. The setUp function will be passed a DocTest
object. The setUp function can access the test globals as the
globs attribute of the test passed.
tearDown
A tear-down function. This is called after running the
tests in each file. The tearDown function will be passed a DocTest
object. The tearDown function can access the test globals as the
globs attribute of the test passed.
globs
A dictionary containing initial global variables for the tests.
optionflags
A set of doctest option flags expressed as an integer.
"""
if test_finder is None:
test_finder = DocTestFinder()
module = _normalize_module(module)
tests = test_finder.find(module, globs=globs, extraglobs=extraglobs)
if globs is None:
globs = module.__dict__
if not tests:
# Why do we want to do this? Because it reveals a bug that might
# otherwise be hidden.
raise ValueError(module, "has no tests")
tests.sort()
suite = unittest.TestSuite()
for test in tests:
if len(test.examples) == 0:
continue
if not test.filename:
filename = module.__file__
if filename[-4:] in (".pyc", ".pyo"):
filename = filename[:-1]
elif sys.platform.startswith('java') and \
filename.endswith('$py.class'):
filename = '%s.py' % filename[:-9]
test.filename = filename
suite.addTest(DocTestCase(test, **options))
return suite
class DocFileCase(DocTestCase):
def id(self):
return '_'.join(self._dt_test.name.split('.'))
def __repr__(self):
return self._dt_test.filename
__str__ = __repr__
def format_failure(self, err):
return ('Failed doctest test for %s\n File "%s", line 0\n\n%s'
% (self._dt_test.name, self._dt_test.filename, err)
)
def DocFileTest(path, module_relative=True, package=None,
globs=None, parser=DocTestParser(), **options):
if globs is None:
globs = {}
if package and not module_relative:
raise ValueError("Package may only be specified for module-"
"relative paths.")
# Relativize the path.
if module_relative:
package = _normalize_module(package)
path = _module_relative_path(package, path)
# Find the file and read it.
name = os.path.basename(path)
doc = open(path).read()
# Convert it to a test, and wrap it in a DocFileCase.
test = parser.get_doctest(doc, globs, name, path, 0)
return DocFileCase(test, **options)
def DocFileSuite(*paths, **kw):
"""A unittest suite for one or more doctest files.
The path to each doctest file is given as a string; the
interpretation of that string depends on the keyword argument
"module_relative".
A number of options may be provided as keyword arguments:
module_relative
If "module_relative" is True, then the given file paths are
interpreted as os-independent module-relative paths. By
default, these paths are relative to the calling module's
directory; but if the "package" argument is specified, then
they are relative to that package. To ensure os-independence,
"filename" should use "/" characters to separate path
segments, and may not be an absolute path (i.e., it may not
begin with "/").
If "module_relative" is False, then the given file paths are
interpreted as os-specific paths. These paths may be absolute
or relative (to the current working directory).
package
A Python package or the name of a Python package whose directory
should be used as the base directory for module relative paths.
If "package" is not specified, then the calling module's
directory is used as the base directory for module relative
filenames. It is an error to specify "package" if
"module_relative" is False.
setUp
A set-up function. This is called before running the
tests in each file. The setUp function will be passed a DocTest
object. The setUp function can access the test globals as the
globs attribute of the test passed.
tearDown
A tear-down function. This is called after running the
tests in each file. The tearDown function will be passed a DocTest
object. The tearDown function can access the test globals as the
globs attribute of the test passed.
globs
A dictionary containing initial global variables for the tests.
optionflags
A set of doctest option flags expressed as an integer.
parser
A DocTestParser (or subclass) that should be used to extract
tests from the files.
"""
suite = unittest.TestSuite()
# We do this here so that _normalize_module is called at the right
# level. If it were called in DocFileTest, then this function
# would be the caller and we might guess the package incorrectly.
if kw.get('module_relative', True):
kw['package'] = _normalize_module(kw.get('package'))
for path in paths:
suite.addTest(DocFileTest(path, **kw))
return suite
######################################################################
## 9. Debugging Support
######################################################################
def script_from_examples(s):
output = []
for piece in DocTestParser().parse(s):
if isinstance(piece, Example):
# Add the example's source code (strip trailing NL)
output.append(piece.source[:-1])
# Add the expected output:
want = piece.want
if want:
output.append('# Expected:')
output += ['## '+l for l in want.split('\n')[:-1]]
else:
# Add non-example text.
output += [_comment_line(l)
for l in piece.split('\n')[:-1]]
# Trim junk on both ends.
while output and output[-1] == '#':
output.pop()
while output and output[0] == '#':
output.pop(0)
# Combine the output, and return it.
# Add a courtesy newline to prevent exec from choking (see bug #1172785)
return '\n'.join(output) + '\n'
def testsource(module, name):
"""Extract the test sources from a doctest docstring as a script.
Provide the module (or dotted name of the module) containing the
test to be debugged and the name (within the module) of the object
with the doc string with tests to be debugged.
"""
module = _normalize_module(module)
tests = DocTestFinder().find(module)
test = [t for t in tests if t.name == name]
if not test:
raise ValueError(name, "not found in tests")
test = test[0]
testsrc = script_from_examples(test.docstring)
return testsrc
def debug_src(src, pm=False, globs=None):
"""Debug a single doctest docstring, in argument `src`'"""
testsrc = script_from_examples(src)
debug_script(testsrc, pm, globs)
def debug_script(src, pm=False, globs=None):
"Debug a test script. `src` is the script, as a string."
import pdb
# Note that tempfile.NameTemporaryFile() cannot be used. As the
# docs say, a file so created cannot be opened by name a second time
# on modern Windows boxes, and execfile() needs to open it.
srcfilename = tempfile.mktemp(".py", "doctestdebug")
f = open(srcfilename, 'w')
f.write(src)
f.close()
try:
if globs:
globs = globs.copy()
else:
globs = {}
if pm:
try:
exec(compile(open(srcfilename).read(), srcfilename, 'exec'), globs, globs)
except:
print(sys.exc_info()[1])
pdb.post_mortem(sys.exc_info()[2])
else:
# Note that %r is vital here. '%s' instead can, e.g., cause
# backslashes to get treated as metacharacters on Windows.
pdb.run("execfile(%r)" % srcfilename, globs, globs)
finally:
os.remove(srcfilename)
def debug(module, name, pm=False):
"""Debug a single doctest docstring.
Provide the module (or dotted name of the module) containing the
test to be debugged and the name (within the module) of the object
with the docstring with tests to be debugged.
"""
module = _normalize_module(module)
testsrc = testsource(module, name)
debug_script(testsrc, pm, module.__dict__)
__test__ = {}