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"""Generic testing tools.
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In particular, this module exposes a set of top-level assert* functions that
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can be used in place of nose.tools.assert* in method generators (the ones in
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nose can not, at least as of nose 0.10.4).
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Authors
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-------
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- Fernando Perez <Fernando.Perez@berkeley.edu>
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"""
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from __future__ import absolute_import
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#-----------------------------------------------------------------------------
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# Copyright (C) 2009-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import os
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import re
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import sys
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import tempfile
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from contextlib import contextmanager
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from io import StringIO
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try:
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# These tools are used by parts of the runtime, so we make the nose
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# dependency optional at this point. Nose is a hard dependency to run the
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# test suite, but NOT to use ipython itself.
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import nose.tools as nt
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has_nose = True
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except ImportError:
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has_nose = False
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from IPython.config.loader import Config
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from IPython.utils.process import find_cmd, getoutputerror
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from IPython.utils.text import list_strings
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from IPython.utils.io import temp_pyfile, Tee
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from IPython.utils import py3compat
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from IPython.utils.encoding import DEFAULT_ENCODING
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from . import decorators as dec
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from . import skipdoctest
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#-----------------------------------------------------------------------------
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# Globals
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#-----------------------------------------------------------------------------
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# Make a bunch of nose.tools assert wrappers that can be used in test
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# generators. This will expose an assert* function for each one in nose.tools.
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_tpl = """
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def %(name)s(*a,**kw):
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return nt.%(name)s(*a,**kw)
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"""
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if has_nose:
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for _x in [a for a in dir(nt) if a.startswith('assert')]:
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exec _tpl % dict(name=_x)
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#-----------------------------------------------------------------------------
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# Functions and classes
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#-----------------------------------------------------------------------------
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# The docstring for full_path doctests differently on win32 (different path
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# separator) so just skip the doctest there. The example remains informative.
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doctest_deco = skipdoctest.skip_doctest if sys.platform == 'win32' else dec.null_deco
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@doctest_deco
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def full_path(startPath,files):
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"""Make full paths for all the listed files, based on startPath.
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Only the base part of startPath is kept, since this routine is typically
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used with a script's __file__ variable as startPath. The base of startPath
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is then prepended to all the listed files, forming the output list.
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Parameters
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----------
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startPath : string
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Initial path to use as the base for the results. This path is split
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using os.path.split() and only its first component is kept.
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files : string or list
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One or more files.
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Examples
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--------
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>>> full_path('/foo/bar.py',['a.txt','b.txt'])
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['/foo/a.txt', '/foo/b.txt']
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>>> full_path('/foo',['a.txt','b.txt'])
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['/a.txt', '/b.txt']
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If a single file is given, the output is still a list:
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>>> full_path('/foo','a.txt')
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['/a.txt']
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"""
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files = list_strings(files)
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base = os.path.split(startPath)[0]
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return [ os.path.join(base,f) for f in files ]
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def parse_test_output(txt):
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"""Parse the output of a test run and return errors, failures.
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Parameters
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----------
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txt : str
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Text output of a test run, assumed to contain a line of one of the
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following forms::
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'FAILED (errors=1)'
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'FAILED (failures=1)'
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'FAILED (errors=1, failures=1)'
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Returns
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-------
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nerr, nfail: number of errors and failures.
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"""
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err_m = re.search(r'^FAILED \(errors=(\d+)\)', txt, re.MULTILINE)
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if err_m:
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nerr = int(err_m.group(1))
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nfail = 0
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return nerr, nfail
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fail_m = re.search(r'^FAILED \(failures=(\d+)\)', txt, re.MULTILINE)
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if fail_m:
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nerr = 0
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nfail = int(fail_m.group(1))
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return nerr, nfail
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both_m = re.search(r'^FAILED \(errors=(\d+), failures=(\d+)\)', txt,
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re.MULTILINE)
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if both_m:
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nerr = int(both_m.group(1))
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nfail = int(both_m.group(2))
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return nerr, nfail
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# If the input didn't match any of these forms, assume no error/failures
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return 0, 0
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# So nose doesn't think this is a test
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parse_test_output.__test__ = False
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def default_argv():
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"""Return a valid default argv for creating testing instances of ipython"""
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return ['--quick', # so no config file is loaded
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# Other defaults to minimize side effects on stdout
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'--colors=NoColor', '--no-term-title','--no-banner',
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'--autocall=0']
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def default_config():
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"""Return a config object with good defaults for testing."""
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config = Config()
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config.TerminalInteractiveShell.colors = 'NoColor'
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config.TerminalTerminalInteractiveShell.term_title = False,
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config.TerminalInteractiveShell.autocall = 0
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config.HistoryManager.hist_file = tempfile.mktemp(u'test_hist.sqlite')
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config.HistoryManager.db_cache_size = 10000
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return config
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def ipexec(fname, options=None):
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"""Utility to call 'ipython filename'.
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Starts IPython witha minimal and safe configuration to make startup as fast
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as possible.
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Note that this starts IPython in a subprocess!
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Parameters
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----------
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fname : str
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Name of file to be executed (should have .py or .ipy extension).
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options : optional, list
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Extra command-line flags to be passed to IPython.
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Returns
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-------
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(stdout, stderr) of ipython subprocess.
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"""
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if options is None: options = []
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# For these subprocess calls, eliminate all prompt printing so we only see
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# output from script execution
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prompt_opts = [ '--PromptManager.in_template=""',
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'--PromptManager.in2_template=""',
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'--PromptManager.out_template=""'
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]
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cmdargs = ' '.join(default_argv() + prompt_opts + options)
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_ip = get_ipython()
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test_dir = os.path.dirname(__file__)
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ipython_cmd = find_cmd('ipython3' if py3compat.PY3 else 'ipython')
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# Absolute path for filename
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full_fname = os.path.join(test_dir, fname)
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full_cmd = '%s %s %s' % (ipython_cmd, cmdargs, full_fname)
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#print >> sys.stderr, 'FULL CMD:', full_cmd # dbg
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out, err = getoutputerror(full_cmd)
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# `import readline` causes 'ESC[?1034h' to be output sometimes,
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# so strip that out before doing comparisons
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if out:
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out = re.sub(r'\x1b\[[^h]+h', '', out)
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return out, err
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def ipexec_validate(fname, expected_out, expected_err='',
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options=None):
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"""Utility to call 'ipython filename' and validate output/error.
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This function raises an AssertionError if the validation fails.
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Note that this starts IPython in a subprocess!
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Parameters
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----------
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fname : str
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Name of the file to be executed (should have .py or .ipy extension).
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expected_out : str
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Expected stdout of the process.
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expected_err : optional, str
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Expected stderr of the process.
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options : optional, list
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Extra command-line flags to be passed to IPython.
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Returns
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-------
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None
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"""
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import nose.tools as nt
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out, err = ipexec(fname, options)
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#print 'OUT', out # dbg
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#print 'ERR', err # dbg
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# If there are any errors, we must check those befor stdout, as they may be
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# more informative than simply having an empty stdout.
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if err:
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if expected_err:
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nt.assert_equals(err.strip(), expected_err.strip())
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else:
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raise ValueError('Running file %r produced error: %r' %
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(fname, err))
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# If no errors or output on stderr was expected, match stdout
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nt.assert_equals(out.strip(), expected_out.strip())
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class TempFileMixin(object):
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"""Utility class to create temporary Python/IPython files.
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Meant as a mixin class for test cases."""
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def mktmp(self, src, ext='.py'):
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"""Make a valid python temp file."""
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fname, f = temp_pyfile(src, ext)
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self.tmpfile = f
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self.fname = fname
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def tearDown(self):
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if hasattr(self, 'tmpfile'):
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# If the tmpfile wasn't made because of skipped tests, like in
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# win32, there's nothing to cleanup.
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self.tmpfile.close()
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try:
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os.unlink(self.fname)
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except:
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# On Windows, even though we close the file, we still can't
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# delete it. I have no clue why
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pass
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pair_fail_msg = ("Testing {0}\n\n"
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"In:\n"
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" {1!r}\n"
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"Expected:\n"
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" {2!r}\n"
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"Got:\n"
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" {3!r}\n")
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def check_pairs(func, pairs):
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"""Utility function for the common case of checking a function with a
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sequence of input/output pairs.
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Parameters
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----------
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func : callable
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The function to be tested. Should accept a single argument.
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pairs : iterable
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A list of (input, expected_output) tuples.
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Returns
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-------
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None. Raises an AssertionError if any output does not match the expected
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value.
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"""
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name = getattr(func, "func_name", getattr(func, "__name__", "<unknown>"))
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for inp, expected in pairs:
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out = func(inp)
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assert out == expected, pair_fail_msg.format(name, inp, expected, out)
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if py3compat.PY3:
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MyStringIO = StringIO
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else:
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# In Python 2, stdout/stderr can have either bytes or unicode written to them,
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# so we need a class that can handle both.
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class MyStringIO(StringIO):
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def write(self, s):
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s = py3compat.cast_unicode(s, encoding=DEFAULT_ENCODING)
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super(MyStringIO, self).write(s)
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notprinted_msg = """Did not find {0!r} in printed output (on {1}):
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{2!r}"""
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class AssertPrints(object):
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"""Context manager for testing that code prints certain text.
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Examples
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--------
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>>> with AssertPrints("abc", suppress=False):
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... print "abcd"
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... print "def"
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...
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abcd
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def
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"""
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def __init__(self, s, channel='stdout', suppress=True):
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self.s = s
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self.channel = channel
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self.suppress = suppress
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def __enter__(self):
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self.orig_stream = getattr(sys, self.channel)
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self.buffer = MyStringIO()
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self.tee = Tee(self.buffer, channel=self.channel)
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setattr(sys, self.channel, self.buffer if self.suppress else self.tee)
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def __exit__(self, etype, value, traceback):
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self.tee.flush()
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setattr(sys, self.channel, self.orig_stream)
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printed = self.buffer.getvalue()
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assert self.s in printed, notprinted_msg.format(self.s, self.channel, printed)
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return False
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class AssertNotPrints(AssertPrints):
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"""Context manager for checking that certain output *isn't* produced.
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Counterpart of AssertPrints"""
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def __exit__(self, etype, value, traceback):
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self.tee.flush()
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setattr(sys, self.channel, self.orig_stream)
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printed = self.buffer.getvalue()
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assert self.s not in printed, notprinted_msg.format(self.s, self.channel, printed)
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return False
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@contextmanager
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def mute_warn():
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from IPython.utils import warn
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save_warn = warn.warn
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warn.warn = lambda *a, **kw: None
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try:
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yield
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finally:
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warn.warn = save_warn
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@contextmanager
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def make_tempfile(name):
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""" Create an empty, named, temporary file for the duration of the context.
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"""
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f = open(name, 'w')
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f.close()
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try:
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yield
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finally:
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os.unlink(name)
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|
