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"""Generic testing tools.
Authors
-------
- Fernando Perez <Fernando.Perez@berkeley.edu>
"""
from __future__ import absolute_import
#-----------------------------------------------------------------------------
# Copyright (C) 2009 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import os
import re
import sys
import tempfile
from contextlib import contextmanager
from io import StringIO
from subprocess import Popen, PIPE
try:
# These tools are used by parts of the runtime, so we make the nose
# dependency optional at this point. Nose is a hard dependency to run the
# test suite, but NOT to use ipython itself.
import nose.tools as nt
has_nose = True
except ImportError:
has_nose = False
from IPython.config.loader import Config
from IPython.utils.process import get_output_error_code
from IPython.utils.text import list_strings
from IPython.utils.io import temp_pyfile, Tee
from IPython.utils import py3compat
from IPython.utils.encoding import DEFAULT_ENCODING
from . import decorators as dec
from . import skipdoctest
#-----------------------------------------------------------------------------
# Functions and classes
#-----------------------------------------------------------------------------
# The docstring for full_path doctests differently on win32 (different path
# separator) so just skip the doctest there. The example remains informative.
doctest_deco = skipdoctest.skip_doctest if sys.platform == 'win32' else dec.null_deco
@doctest_deco
def 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']
"""
files = list_strings(files)
base = os.path.split(startPath)[0]
return [ os.path.join(base,f) for f in files ]
def 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.
"""
err_m = re.search(r'^FAILED \(errors=(\d+)\)', txt, re.MULTILINE)
if err_m:
nerr = int(err_m.group(1))
nfail = 0
return nerr, nfail
fail_m = re.search(r'^FAILED \(failures=(\d+)\)', txt, re.MULTILINE)
if fail_m:
nerr = 0
nfail = int(fail_m.group(1))
return nerr, nfail
both_m = re.search(r'^FAILED \(errors=(\d+), failures=(\d+)\)', txt,
re.MULTILINE)
if both_m:
nerr = int(both_m.group(1))
nfail = int(both_m.group(2))
return nerr, nfail
# If the input didn't match any of these forms, assume no error/failures
return 0, 0
# So nose doesn't think this is a test
parse_test_output.__test__ = False
def default_argv():
"""Return a valid default argv for creating testing instances of ipython"""
return ['--quick', # so no config file is loaded
# Other defaults to minimize side effects on stdout
'--colors=NoColor', '--no-term-title','--no-banner',
'--autocall=0']
def default_config():
"""Return a config object with good defaults for testing."""
config = Config()
config.TerminalInteractiveShell.colors = 'NoColor'
config.TerminalTerminalInteractiveShell.term_title = False,
config.TerminalInteractiveShell.autocall = 0
f = tempfile.NamedTemporaryFile(suffix=u'test_hist.sqlite', delete=False)
config.HistoryManager.hist_file = f.name
f.close()
config.HistoryManager.db_cache_size = 10000
return config
def 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_cmd = [sys.executable, "-m", "IPython"]
if as_string:
ipython_cmd = " ".join(ipython_cmd)
return ipython_cmd
def 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.
"""
if options is None: options = []
# For these subprocess calls, eliminate all prompt printing so we only see
# output from script execution
prompt_opts = [ '--PromptManager.in_template=""',
'--PromptManager.in2_template=""',
'--PromptManager.out_template=""'
]
cmdargs = default_argv() + prompt_opts + options
test_dir = os.path.dirname(__file__)
ipython_cmd = get_ipython_cmd()
# Absolute path for filename
full_fname = os.path.join(test_dir, fname)
full_cmd = ipython_cmd + cmdargs + [full_fname]
env = os.environ.copy()
# FIXME: ignore all warnings in ipexec while we have shims
# should we keep suppressing warnings here, even after removing shims?
env['PYTHONWARNINGS'] = 'ignore'
# env.pop('PYTHONWARNINGS', None) # Avoid extraneous warnings appearing on stderr
for k, v in env.items():
# Debug a bizarre failure we've seen on Windows:
# TypeError: environment can only contain strings
if not isinstance(v, str):
print(k, v)
p = Popen(full_cmd, stdout=PIPE, stderr=PIPE, stdin=PIPE, env=env)
out, err = p.communicate(input=py3compat.str_to_bytes('\n'.join(commands)) or None)
out, err = py3compat.bytes_to_str(out), py3compat.bytes_to_str(err)
# `import readline` causes 'ESC[?1034h' to be output sometimes,
# so strip that out before doing comparisons
if out:
out = re.sub(r'\x1b\[[^h]+h', '', out)
return out, err
def 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
"""
import nose.tools as nt
out, err = ipexec(fname, options, commands)
#print 'OUT', out # dbg
#print 'ERR', err # dbg
# If there are any errors, we must check those befor stdout, as they may be
# more informative than simply having an empty stdout.
if err:
if expected_err:
nt.assert_equal("\n".join(err.strip().splitlines()), "\n".join(expected_err.strip().splitlines()))
else:
raise ValueError('Running file %r produced error: %r' %
(fname, err))
# If no errors or output on stderr was expected, match stdout
nt.assert_equal("\n".join(out.strip().splitlines()), "\n".join(expected_out.strip().splitlines()))
class TempFileMixin(object):
"""Utility class to create temporary Python/IPython files.
Meant as a mixin class for test cases."""
def mktmp(self, src, ext='.py'):
"""Make a valid python temp file."""
fname, f = temp_pyfile(src, ext)
self.tmpfile = f
self.fname = fname
def tearDown(self):
if hasattr(self, 'tmpfile'):
# If the tmpfile wasn't made because of skipped tests, like in
# win32, there's nothing to cleanup.
self.tmpfile.close()
try:
os.unlink(self.fname)
except:
# On Windows, even though we close the file, we still can't
# delete it. I have no clue why
pass
pair_fail_msg = ("Testing {0}\n\n"
"In:\n"
" {1!r}\n"
"Expected:\n"
" {2!r}\n"
"Got:\n"
" {3!r}\n")
def 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.
"""
name = getattr(func, "func_name", getattr(func, "__name__", "<unknown>"))
for inp, expected in pairs:
out = func(inp)
assert out == expected, pair_fail_msg.format(name, inp, expected, out)
if py3compat.PY3:
MyStringIO = StringIO
else:
# In Python 2, stdout/stderr can have either bytes or unicode written to them,
# so we need a class that can handle both.
class MyStringIO(StringIO):
def write(self, s):
s = py3compat.cast_unicode(s, encoding=DEFAULT_ENCODING)
super(MyStringIO, self).write(s)
_re_type = type(re.compile(r''))
notprinted_msg = """Did not find {0!r} in printed output (on {1}):
-------
{2!s}
-------
"""
class AssertPrints(object):
"""Context manager for testing that code prints certain text.
Examples
--------
>>> with AssertPrints("abc", suppress=False):
... print("abcd")
... print("def")
...
abcd
def
"""
def __init__(self, s, channel='stdout', suppress=True):
self.s = s
if isinstance(self.s, (py3compat.string_types, _re_type)):
self.s = [self.s]
self.channel = channel
self.suppress = suppress
def __enter__(self):
self.orig_stream = getattr(sys, self.channel)
self.buffer = MyStringIO()
self.tee = Tee(self.buffer, channel=self.channel)
setattr(sys, self.channel, self.buffer if self.suppress else self.tee)
def __exit__(self, etype, value, traceback):
try:
if value is not None:
# If an error was raised, don't check anything else
return False
self.tee.flush()
setattr(sys, self.channel, self.orig_stream)
printed = self.buffer.getvalue()
for s in self.s:
if isinstance(s, _re_type):
assert s.search(printed), notprinted_msg.format(s.pattern, self.channel, printed)
else:
assert s in printed, notprinted_msg.format(s, self.channel, printed)
return False
finally:
self.tee.close()
printed_msg = """Found {0!r} in printed output (on {1}):
-------
{2!s}
-------
"""
class AssertNotPrints(AssertPrints):
"""Context manager for checking that certain output *isn't* produced.
Counterpart of AssertPrints"""
def __exit__(self, etype, value, traceback):
try:
if value is not None:
# If an error was raised, don't check anything else
self.tee.close()
return False
self.tee.flush()
setattr(sys, self.channel, self.orig_stream)
printed = self.buffer.getvalue()
for s in self.s:
if isinstance(s, _re_type):
assert not s.search(printed),printed_msg.format(
s.pattern, self.channel, printed)
else:
assert s not in printed, printed_msg.format(
s, self.channel, printed)
return False
finally:
self.tee.close()
@contextmanager
def mute_warn():
from IPython.utils import warn
save_warn = warn.warn
warn.warn = lambda *a, **kw: None
try:
yield
finally:
warn.warn = save_warn
@contextmanager
def make_tempfile(name):
""" Create an empty, named, temporary file for the duration of the context.
"""
f = open(name, 'w')
f.close()
try:
yield
finally:
os.unlink(name)
@contextmanager
def monkeypatch(obj, name, attr):
"""
Context manager to replace attribute named `name` in `obj` with `attr`.
"""
orig = getattr(obj, name)
setattr(obj, name, attr)
yield
setattr(obj, name, orig)
def help_output_test(subcommand=''):
"""test that `ipython [subcommand] -h` works"""
cmd = get_ipython_cmd() + [subcommand, '-h']
out, err, rc = get_output_error_code(cmd)
nt.assert_equal(rc, 0, err)
nt.assert_not_in("Traceback", err)
nt.assert_in("Options", out)
nt.assert_in("--help-all", out)
return out, err
def help_all_output_test(subcommand=''):
"""test that `ipython [subcommand] --help-all` works"""
cmd = get_ipython_cmd() + [subcommand, '--help-all']
out, err, rc = get_output_error_code(cmd)
nt.assert_equal(rc, 0, err)
nt.assert_not_in("Traceback", err)
nt.assert_in("Options", out)
nt.assert_in("Class parameters", out)
return out, err
def 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.
"""
for i in range(0, len(a), chunk_size):
chunk_a = a[i:i + chunk_size]
chunk_b = b[i:i + chunk_size]
nt.assert_equal(chunk_a, chunk_b, "[offset: %i]\n%r != \n%r" % (
i, chunk_a, chunk_b))
if len(a) > len(b):
nt.fail("Length doesn't match (%i > %i). Extra text:\n%r" % (
len(a), len(b), a[len(b):]
))
elif len(a) < len(b):
nt.fail("Length doesn't match (%i < %i). Extra text:\n%r" % (
len(a), len(b), b[len(a):]
))
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