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This documentation is for an old version of IPython. You can find docs for newer versions here.

Module: testing.tools

Generic testing tools.

Authors

4 Classes

class IPython.testing.tools.TempFileMixin

Bases: object

Utility class to create temporary Python/IPython files.

Meant as a mixin class for test cases.

mktmp(src, ext='.py')

Make a valid python temp file.

IPython.testing.tools.MyStringIO

alias of StringIO

class IPython.testing.tools.AssertPrints(s, channel='stdout', suppress=True)

Bases: object

Context manager for testing that code prints certain text.

Examples

>>> with AssertPrints("abc", suppress=False):
...     print("abcd")
...     print("def")
... 
abcd
def
__init__(s, channel='stdout', suppress=True)
class IPython.testing.tools.AssertNotPrints(s, channel='stdout', suppress=True)

Bases: IPython.testing.tools.AssertPrints

Context manager for checking that certain output isn’t produced.

Counterpart of AssertPrints

14 Functions

IPython.testing.tools.full_path(startPath, files)

Make full paths for all the listed files, based on startPath.

Only the base part of startPath is kept, since this routine is typically used with a script’s __file__ variable as startPath. The base of startPath is then prepended to all the listed files, forming the output list.

Parameters:

startPath : string

Initial path to use as the base for the results. This path is split using os.path.split() and only its first component is kept.

files : string or list

One or more files.

Examples

>>> full_path('/foo/bar.py',['a.txt','b.txt'])
['/foo/a.txt', '/foo/b.txt']

>>> full_path('/foo',['a.txt','b.txt'])
['/a.txt', '/b.txt']

If a single file is given, the output is still a list:

>>> full_path('/foo','a.txt')
['/a.txt']
IPython.testing.tools.parse_test_output(txt)

Parse the output of a test run and return errors, failures.

Parameters:

txt : str

Text output of a test run, assumed to contain a line of one of the following forms:

'FAILED (errors=1)'
'FAILED (failures=1)'
'FAILED (errors=1, failures=1)'
Returns:

nerr, nfail

number of errors and failures.
IPython.testing.tools.default_argv()

Return a valid default argv for creating testing instances of ipython

IPython.testing.tools.default_config()

Return a config object with good defaults for testing.

IPython.testing.tools.get_ipython_cmd(as_string=False)

Return appropriate IPython command line name. By default, this will return a list that can be used with subprocess.Popen, for example, but passing as_string=True allows for returning the IPython command as a string.

Parameters:

as_string: bool

Flag to allow to return the command as a string.
IPython.testing.tools.ipexec(fname, options=None, commands=())

Utility to call ‘ipython filename’.

Starts IPython with a minimal and safe configuration to make startup as fast as possible.

Note that this starts IPython in a subprocess!

Parameters:

fname : str

Name of file to be executed (should have .py or .ipy extension).

options : optional, list

Extra command-line flags to be passed to IPython.

commands : optional, list

Commands to send in on stdin
Returns:

(stdout, stderr) of ipython subprocess.
IPython.testing.tools.ipexec_validate(fname, expected_out, expected_err='', options=None, commands=())

Utility to call ‘ipython filename’ and validate output/error.

This function raises an AssertionError if the validation fails.

Note that this starts IPython in a subprocess!

Parameters:

fname : str

Name of the file to be executed (should have .py or .ipy extension).

expected_out : str

Expected stdout of the process.

expected_err : optional, str

Expected stderr of the process.

options : optional, list

Extra command-line flags to be passed to IPython.
Returns:

None
IPython.testing.tools.check_pairs(func, pairs)

Utility function for the common case of checking a function with a sequence of input/output pairs.

Parameters:

func : callable

The function to be tested. Should accept a single argument.

pairs : iterable

A list of (input, expected_output) tuples.
Returns:

None. Raises an AssertionError if any output does not match the expected

value.
IPython.testing.tools.mute_warn()
IPython.testing.tools.make_tempfile(name)

Create an empty, named, temporary file for the duration of the context.

IPython.testing.tools.monkeypatch(obj, name, attr)

Context manager to replace attribute named name in obj with attr.

IPython.testing.tools.help_output_test(subcommand='')

test that ipython [subcommand] -h works

IPython.testing.tools.help_all_output_test(subcommand='')

test that ipython [subcommand] --help-all works

IPython.testing.tools.assert_big_text_equal(a, b, chunk_size=80)

assert that large strings are equal

Zooms in on first chunk that differs, to give better info than vanilla assertEqual for large text blobs.