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"""Generic testing tools.
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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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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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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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from subprocess import Popen, PIPE
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from unittest.mock import patch
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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 traitlets.config.loader import Config
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from IPython.utils.process import get_output_error_code
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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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# 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
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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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f = tempfile.NamedTemporaryFile(suffix=u'test_hist.sqlite', delete=False)
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config.HistoryManager.hist_file = f.name
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f.close()
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config.HistoryManager.db_cache_size = 10000
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return config
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def get_ipython_cmd(as_string=False):
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"""
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Return appropriate IPython command line name. By default, this will return
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a list that can be used with subprocess.Popen, for example, but passing
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`as_string=True` allows for returning the IPython command as a string.
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Parameters
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----------
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as_string: bool
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Flag to allow to return the command as a string.
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"""
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ipython_cmd = [sys.executable, "-m", "IPython"]
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if as_string:
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ipython_cmd = " ".join(ipython_cmd)
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return ipython_cmd
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def ipexec(fname, options=None, commands=()):
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"""Utility to call 'ipython filename'.
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Starts IPython with a 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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commands : optional, list
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Commands to send in on stdin
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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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cmdargs = default_argv() + options
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test_dir = os.path.dirname(__file__)
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ipython_cmd = get_ipython_cmd()
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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 = ipython_cmd + cmdargs + [full_fname]
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env = os.environ.copy()
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# FIXME: ignore all warnings in ipexec while we have shims
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# should we keep suppressing warnings here, even after removing shims?
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env['PYTHONWARNINGS'] = 'ignore'
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# env.pop('PYTHONWARNINGS', None) # Avoid extraneous warnings appearing on stderr
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for k, v in env.items():
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# Debug a bizarre failure we've seen on Windows:
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# TypeError: environment can only contain strings
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if not isinstance(v, str):
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print(k, v)
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p = Popen(full_cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE, env=env)
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out, err = p.communicate(input=py3compat.str_to_bytes('\n'.join(commands)) or None)
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out, err = py3compat.bytes_to_str(out), py3compat.bytes_to_str(err)
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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, commands=()):
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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, commands)
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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_equal("\n".join(err.strip().splitlines()), "\n".join(expected_err.strip().splitlines()))
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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_equal("\n".join(out.strip().splitlines()), "\n".join(expected_out.strip().splitlines()))
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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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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.tearDown()
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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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MyStringIO = StringIO
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_re_type = type(re.compile(r''))
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notprinted_msg = """Did not find {0!r} in printed output (on {1}):
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-------
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{2!s}
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-------
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"""
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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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if isinstance(self.s, (str, _re_type)):
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self.s = [self.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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try:
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if value is not None:
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# If an error was raised, don't check anything else
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return False
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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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for s in self.s:
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if isinstance(s, _re_type):
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assert s.search(printed), notprinted_msg.format(s.pattern, self.channel, printed)
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else:
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assert s in printed, notprinted_msg.format(s, self.channel, printed)
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return False
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finally:
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self.tee.close()
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printed_msg = """Found {0!r} in printed output (on {1}):
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-------
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{2!s}
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-------
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"""
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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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try:
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if value is not None:
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# If an error was raised, don't check anything else
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self.tee.close()
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return False
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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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for s in self.s:
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if isinstance(s, _re_type):
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assert not s.search(printed),printed_msg.format(
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s.pattern, self.channel, printed)
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else:
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assert s not in printed, printed_msg.format(
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s, self.channel, printed)
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return False
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finally:
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self.tee.close()
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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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def fake_input(inputs):
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"""Temporarily replace the input() function to return the given values
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Use as a context manager:
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with fake_input(['result1', 'result2']):
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...
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Values are returned in order. If input() is called again after the last value
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was used, EOFError is raised.
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"""
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it = iter(inputs)
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def mock_input(prompt=''):
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try:
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return next(it)
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except StopIteration:
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raise EOFError('No more inputs given')
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return patch('builtins.input', mock_input)
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def help_output_test(subcommand=''):
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"""test that `ipython [subcommand] -h` works"""
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cmd = get_ipython_cmd() + [subcommand, '-h']
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out, err, rc = get_output_error_code(cmd)
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nt.assert_equal(rc, 0, err)
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nt.assert_not_in("Traceback", err)
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nt.assert_in("Options", out)
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nt.assert_in("--help-all", out)
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return out, err
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def help_all_output_test(subcommand=''):
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"""test that `ipython [subcommand] --help-all` works"""
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cmd = get_ipython_cmd() + [subcommand, '--help-all']
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out, err, rc = get_output_error_code(cmd)
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nt.assert_equal(rc, 0, err)
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nt.assert_not_in("Traceback", err)
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nt.assert_in("Options", out)
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nt.assert_in("Class parameters", out)
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return out, err
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