540 lines
20 KiB
Python
540 lines
20 KiB
Python
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from __future__ import print_function, absolute_import
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import os
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import tempfile
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import unittest
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import sys
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import re
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import warnings
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import io
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from textwrap import dedent
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from future.utils import bind_method, PY26, PY3, PY2, PY27
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from future.moves.subprocess import check_output, STDOUT, CalledProcessError
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if PY26:
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import unittest2 as unittest
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def reformat_code(code):
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"""
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Removes any leading \n and dedents.
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"""
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if code.startswith('\n'):
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code = code[1:]
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return dedent(code)
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def order_future_lines(code):
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"""
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Returns the code block with any ``__future__`` import lines sorted, and
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then any ``future`` import lines sorted, then any ``builtins`` import lines
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sorted.
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This only sorts the lines within the expected blocks.
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See test_order_future_lines() for an example.
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"""
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# We need .splitlines(keepends=True), which doesn't exist on Py2,
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# so we use this instead:
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lines = code.split('\n')
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uufuture_line_numbers = [i for i, line in enumerate(lines)
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if line.startswith('from __future__ import ')]
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future_line_numbers = [i for i, line in enumerate(lines)
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if line.startswith('from future')
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or line.startswith('from past')]
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builtins_line_numbers = [i for i, line in enumerate(lines)
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if line.startswith('from builtins')]
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assert code.lstrip() == code, ('internal usage error: '
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'dedent the code before calling order_future_lines()')
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def mymax(numbers):
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return max(numbers) if len(numbers) > 0 else 0
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def mymin(numbers):
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return min(numbers) if len(numbers) > 0 else float('inf')
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assert mymax(uufuture_line_numbers) <= mymin(future_line_numbers), \
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'the __future__ and future imports are out of order'
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# assert mymax(future_line_numbers) <= mymin(builtins_line_numbers), \
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# 'the future and builtins imports are out of order'
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uul = sorted([lines[i] for i in uufuture_line_numbers])
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sorted_uufuture_lines = dict(zip(uufuture_line_numbers, uul))
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fl = sorted([lines[i] for i in future_line_numbers])
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sorted_future_lines = dict(zip(future_line_numbers, fl))
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bl = sorted([lines[i] for i in builtins_line_numbers])
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sorted_builtins_lines = dict(zip(builtins_line_numbers, bl))
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# Replace the old unsorted "from __future__ import ..." lines with the
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# new sorted ones:
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new_lines = []
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for i in range(len(lines)):
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if i in uufuture_line_numbers:
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new_lines.append(sorted_uufuture_lines[i])
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elif i in future_line_numbers:
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new_lines.append(sorted_future_lines[i])
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elif i in builtins_line_numbers:
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new_lines.append(sorted_builtins_lines[i])
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else:
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new_lines.append(lines[i])
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return '\n'.join(new_lines)
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class VerboseCalledProcessError(CalledProcessError):
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"""
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Like CalledProcessError, but it displays more information (message and
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script output) for diagnosing test failures etc.
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"""
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def __init__(self, msg, returncode, cmd, output=None):
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self.msg = msg
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self.returncode = returncode
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self.cmd = cmd
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self.output = output
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def __str__(self):
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return ("Command '%s' failed with exit status %d\nMessage: %s\nOutput: %s"
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% (self.cmd, self.returncode, self.msg, self.output))
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class FuturizeError(VerboseCalledProcessError):
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pass
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class PasteurizeError(VerboseCalledProcessError):
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pass
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class CodeHandler(unittest.TestCase):
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"""
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Handy mixin for test classes for writing / reading / futurizing /
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running .py files in the test suite.
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"""
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def setUp(self):
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"""
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The outputs from the various futurize stages should have the
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following headers:
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"""
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# After stage1:
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# TODO: use this form after implementing a fixer to consolidate
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# __future__ imports into a single line:
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# self.headers1 = """
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# from __future__ import absolute_import, division, print_function
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# """
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self.headers1 = reformat_code("""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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""")
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# After stage2 --all-imports:
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# TODO: use this form after implementing a fixer to consolidate
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# __future__ imports into a single line:
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# self.headers2 = """
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# from __future__ import (absolute_import, division,
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# print_function, unicode_literals)
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# from future import standard_library
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# from future.builtins import *
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# """
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self.headers2 = reformat_code("""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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from future import standard_library
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standard_library.install_aliases()
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from builtins import *
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""")
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self.interpreters = [sys.executable]
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self.tempdir = tempfile.mkdtemp() + os.path.sep
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pypath = os.getenv('PYTHONPATH')
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if pypath:
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self.env = {'PYTHONPATH': os.getcwd() + os.pathsep + pypath}
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else:
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self.env = {'PYTHONPATH': os.getcwd()}
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def convert(self, code, stages=(1, 2), all_imports=False, from3=False,
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reformat=True, run=True, conservative=False):
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"""
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Converts the code block using ``futurize`` and returns the
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resulting code.
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Passing stages=[1] or stages=[2] passes the flag ``--stage1`` or
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``stage2`` to ``futurize``. Passing both stages runs ``futurize``
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with both stages by default.
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If from3 is False, runs ``futurize``, converting from Python 2 to
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both 2 and 3. If from3 is True, runs ``pasteurize`` to convert
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from Python 3 to both 2 and 3.
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Optionally reformats the code block first using the reformat() function.
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If run is True, runs the resulting code under all Python
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interpreters in self.interpreters.
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"""
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if reformat:
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code = reformat_code(code)
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self._write_test_script(code)
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self._futurize_test_script(stages=stages, all_imports=all_imports,
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from3=from3, conservative=conservative)
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output = self._read_test_script()
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if run:
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for interpreter in self.interpreters:
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_ = self._run_test_script(interpreter=interpreter)
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return output
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def compare(self, output, expected, ignore_imports=True):
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"""
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Compares whether the code blocks are equal. If not, raises an
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exception so the test fails. Ignores any trailing whitespace like
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blank lines.
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If ignore_imports is True, passes the code blocks into the
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strip_future_imports method.
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If one code block is a unicode string and the other a
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byte-string, it assumes the byte-string is encoded as utf-8.
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"""
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if ignore_imports:
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output = self.strip_future_imports(output)
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expected = self.strip_future_imports(expected)
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if isinstance(output, bytes) and not isinstance(expected, bytes):
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output = output.decode('utf-8')
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if isinstance(expected, bytes) and not isinstance(output, bytes):
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expected = expected.decode('utf-8')
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self.assertEqual(order_future_lines(output.rstrip()),
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expected.rstrip())
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def strip_future_imports(self, code):
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"""
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Strips any of these import lines:
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from __future__ import <anything>
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from future <anything>
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from future.<anything>
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from builtins <anything>
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or any line containing:
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install_hooks()
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or:
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install_aliases()
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Limitation: doesn't handle imports split across multiple lines like
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this:
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from __future__ import (absolute_import, division, print_function,
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unicode_literals)
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"""
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output = []
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# We need .splitlines(keepends=True), which doesn't exist on Py2,
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# so we use this instead:
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for line in code.split('\n'):
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if not (line.startswith('from __future__ import ')
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or line.startswith('from future ')
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or line.startswith('from builtins ')
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or 'install_hooks()' in line
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or 'install_aliases()' in line
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# but don't match "from future_builtins" :)
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or line.startswith('from future.')):
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output.append(line)
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return '\n'.join(output)
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def convert_check(self, before, expected, stages=(1, 2), all_imports=False,
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ignore_imports=True, from3=False, run=True,
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conservative=False):
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"""
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Convenience method that calls convert() and compare().
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Reformats the code blocks automatically using the reformat_code()
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function.
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If all_imports is passed, we add the appropriate import headers
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for the stage(s) selected to the ``expected`` code-block, so they
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needn't appear repeatedly in the test code.
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If ignore_imports is True, ignores the presence of any lines
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beginning:
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from __future__ import ...
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from future import ...
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for the purpose of the comparison.
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"""
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output = self.convert(before, stages=stages, all_imports=all_imports,
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from3=from3, run=run, conservative=conservative)
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if all_imports:
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headers = self.headers2 if 2 in stages else self.headers1
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else:
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headers = ''
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reformatted = reformat_code(expected)
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if headers in reformatted:
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headers = ''
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self.compare(output, headers + reformatted,
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ignore_imports=ignore_imports)
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def unchanged(self, code, **kwargs):
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"""
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Convenience method to ensure the code is unchanged by the
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futurize process.
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"""
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self.convert_check(code, code, **kwargs)
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def _write_test_script(self, code, filename='mytestscript.py'):
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"""
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Dedents the given code (a multiline string) and writes it out to
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a file in a temporary folder like /tmp/tmpUDCn7x/mytestscript.py.
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"""
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if isinstance(code, bytes):
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code = code.decode('utf-8')
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# Be explicit about encoding the temp file as UTF-8 (issue #63):
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with io.open(self.tempdir + filename, 'wt', encoding='utf-8') as f:
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f.write(dedent(code))
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def _read_test_script(self, filename='mytestscript.py'):
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with io.open(self.tempdir + filename, 'rt', encoding='utf-8') as f:
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newsource = f.read()
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return newsource
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def _futurize_test_script(self, filename='mytestscript.py', stages=(1, 2),
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all_imports=False, from3=False,
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conservative=False):
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params = []
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stages = list(stages)
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if all_imports:
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params.append('--all-imports')
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if from3:
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script = 'pasteurize.py'
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else:
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script = 'futurize.py'
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if stages == [1]:
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params.append('--stage1')
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elif stages == [2]:
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params.append('--stage2')
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else:
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assert stages == [1, 2]
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if conservative:
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params.append('--conservative')
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# No extra params needed
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# Absolute file path:
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fn = self.tempdir + filename
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call_args = [sys.executable, script] + params + ['-w', fn]
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try:
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output = check_output(call_args, stderr=STDOUT, env=self.env)
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except CalledProcessError as e:
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with open(fn) as f:
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msg = (
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'Error running the command %s\n'
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'%s\n'
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'Contents of file %s:\n'
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'\n'
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'%s') % (
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' '.join(call_args),
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'env=%s' % self.env,
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fn,
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'----\n%s\n----' % f.read(),
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)
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ErrorClass = (FuturizeError if 'futurize' in script else PasteurizeError)
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if not hasattr(e, 'output'):
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# The attribute CalledProcessError.output doesn't exist on Py2.6
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e.output = None
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raise ErrorClass(msg, e.returncode, e.cmd, output=e.output)
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return output
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def _run_test_script(self, filename='mytestscript.py',
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interpreter=sys.executable):
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# Absolute file path:
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fn = self.tempdir + filename
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try:
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output = check_output([interpreter, fn],
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env=self.env, stderr=STDOUT)
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except CalledProcessError as e:
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with open(fn) as f:
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msg = (
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'Error running the command %s\n'
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'%s\n'
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'Contents of file %s:\n'
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'\n'
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'%s') % (
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' '.join([interpreter, fn]),
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'env=%s' % self.env,
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fn,
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'----\n%s\n----' % f.read(),
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)
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if not hasattr(e, 'output'):
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# The attribute CalledProcessError.output doesn't exist on Py2.6
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e.output = None
|
||
|
|
raise VerboseCalledProcessError(msg, e.returncode, e.cmd, output=e.output)
|
||
|
|
return output
|
||
|
|
|
||
|
|
|
||
|
|
# Decorator to skip some tests on Python 2.6 ...
|
||
|
|
skip26 = unittest.skipIf(PY26, "this test is known to fail on Py2.6")
|
||
|
|
|
||
|
|
|
||
|
|
def expectedFailurePY3(func):
|
||
|
|
if not PY3:
|
||
|
|
return func
|
||
|
|
return unittest.expectedFailure(func)
|
||
|
|
|
||
|
|
def expectedFailurePY26(func):
|
||
|
|
if not PY26:
|
||
|
|
return func
|
||
|
|
return unittest.expectedFailure(func)
|
||
|
|
|
||
|
|
|
||
|
|
def expectedFailurePY27(func):
|
||
|
|
if not PY27:
|
||
|
|
return func
|
||
|
|
return unittest.expectedFailure(func)
|
||
|
|
|
||
|
|
|
||
|
|
def expectedFailurePY2(func):
|
||
|
|
if not PY2:
|
||
|
|
return func
|
||
|
|
return unittest.expectedFailure(func)
|
||
|
|
|
||
|
|
|
||
|
|
# Renamed in Py3.3:
|
||
|
|
if not hasattr(unittest.TestCase, 'assertRaisesRegex'):
|
||
|
|
unittest.TestCase.assertRaisesRegex = unittest.TestCase.assertRaisesRegexp
|
||
|
|
|
||
|
|
# From Py3.3:
|
||
|
|
def assertRegex(self, text, expected_regex, msg=None):
|
||
|
|
"""Fail the test unless the text matches the regular expression."""
|
||
|
|
if isinstance(expected_regex, (str, unicode)):
|
||
|
|
assert expected_regex, "expected_regex must not be empty."
|
||
|
|
expected_regex = re.compile(expected_regex)
|
||
|
|
if not expected_regex.search(text):
|
||
|
|
msg = msg or "Regex didn't match"
|
||
|
|
msg = '%s: %r not found in %r' % (msg, expected_regex.pattern, text)
|
||
|
|
raise self.failureException(msg)
|
||
|
|
|
||
|
|
if not hasattr(unittest.TestCase, 'assertRegex'):
|
||
|
|
bind_method(unittest.TestCase, 'assertRegex', assertRegex)
|
||
|
|
|
||
|
|
class _AssertRaisesBaseContext(object):
|
||
|
|
|
||
|
|
def __init__(self, expected, test_case, callable_obj=None,
|
||
|
|
expected_regex=None):
|
||
|
|
self.expected = expected
|
||
|
|
self.test_case = test_case
|
||
|
|
if callable_obj is not None:
|
||
|
|
try:
|
||
|
|
self.obj_name = callable_obj.__name__
|
||
|
|
except AttributeError:
|
||
|
|
self.obj_name = str(callable_obj)
|
||
|
|
else:
|
||
|
|
self.obj_name = None
|
||
|
|
if isinstance(expected_regex, (bytes, str)):
|
||
|
|
expected_regex = re.compile(expected_regex)
|
||
|
|
self.expected_regex = expected_regex
|
||
|
|
self.msg = None
|
||
|
|
|
||
|
|
def _raiseFailure(self, standardMsg):
|
||
|
|
msg = self.test_case._formatMessage(self.msg, standardMsg)
|
||
|
|
raise self.test_case.failureException(msg)
|
||
|
|
|
||
|
|
def handle(self, name, callable_obj, args, kwargs):
|
||
|
|
"""
|
||
|
|
If callable_obj is None, assertRaises/Warns is being used as a
|
||
|
|
context manager, so check for a 'msg' kwarg and return self.
|
||
|
|
If callable_obj is not None, call it passing args and kwargs.
|
||
|
|
"""
|
||
|
|
if callable_obj is None:
|
||
|
|
self.msg = kwargs.pop('msg', None)
|
||
|
|
return self
|
||
|
|
with self:
|
||
|
|
callable_obj(*args, **kwargs)
|
||
|
|
|
||
|
|
class _AssertWarnsContext(_AssertRaisesBaseContext):
|
||
|
|
"""A context manager used to implement TestCase.assertWarns* methods."""
|
||
|
|
|
||
|
|
def __enter__(self):
|
||
|
|
# The __warningregistry__'s need to be in a pristine state for tests
|
||
|
|
# to work properly.
|
||
|
|
for v in sys.modules.values():
|
||
|
|
if getattr(v, '__warningregistry__', None):
|
||
|
|
v.__warningregistry__ = {}
|
||
|
|
self.warnings_manager = warnings.catch_warnings(record=True)
|
||
|
|
self.warnings = self.warnings_manager.__enter__()
|
||
|
|
warnings.simplefilter("always", self.expected)
|
||
|
|
return self
|
||
|
|
|
||
|
|
def __exit__(self, exc_type, exc_value, tb):
|
||
|
|
self.warnings_manager.__exit__(exc_type, exc_value, tb)
|
||
|
|
if exc_type is not None:
|
||
|
|
# let unexpected exceptions pass through
|
||
|
|
return
|
||
|
|
try:
|
||
|
|
exc_name = self.expected.__name__
|
||
|
|
except AttributeError:
|
||
|
|
exc_name = str(self.expected)
|
||
|
|
first_matching = None
|
||
|
|
for m in self.warnings:
|
||
|
|
w = m.message
|
||
|
|
if not isinstance(w, self.expected):
|
||
|
|
continue
|
||
|
|
if first_matching is None:
|
||
|
|
first_matching = w
|
||
|
|
if (self.expected_regex is not None and
|
||
|
|
not self.expected_regex.search(str(w))):
|
||
|
|
continue
|
||
|
|
# store warning for later retrieval
|
||
|
|
self.warning = w
|
||
|
|
self.filename = m.filename
|
||
|
|
self.lineno = m.lineno
|
||
|
|
return
|
||
|
|
# Now we simply try to choose a helpful failure message
|
||
|
|
if first_matching is not None:
|
||
|
|
self._raiseFailure('"{}" does not match "{}"'.format(
|
||
|
|
self.expected_regex.pattern, str(first_matching)))
|
||
|
|
if self.obj_name:
|
||
|
|
self._raiseFailure("{} not triggered by {}".format(exc_name,
|
||
|
|
self.obj_name))
|
||
|
|
else:
|
||
|
|
self._raiseFailure("{} not triggered".format(exc_name))
|
||
|
|
|
||
|
|
|
||
|
|
def assertWarns(self, expected_warning, callable_obj=None, *args, **kwargs):
|
||
|
|
"""Fail unless a warning of class warnClass is triggered
|
||
|
|
by callable_obj when invoked with arguments args and keyword
|
||
|
|
arguments kwargs. If a different type of warning is
|
||
|
|
triggered, it will not be handled: depending on the other
|
||
|
|
warning filtering rules in effect, it might be silenced, printed
|
||
|
|
out, or raised as an exception.
|
||
|
|
|
||
|
|
If called with callable_obj omitted or None, will return a
|
||
|
|
context object used like this::
|
||
|
|
|
||
|
|
with self.assertWarns(SomeWarning):
|
||
|
|
do_something()
|
||
|
|
|
||
|
|
An optional keyword argument 'msg' can be provided when assertWarns
|
||
|
|
is used as a context object.
|
||
|
|
|
||
|
|
The context manager keeps a reference to the first matching
|
||
|
|
warning as the 'warning' attribute; similarly, the 'filename'
|
||
|
|
and 'lineno' attributes give you information about the line
|
||
|
|
of Python code from which the warning was triggered.
|
||
|
|
This allows you to inspect the warning after the assertion::
|
||
|
|
|
||
|
|
with self.assertWarns(SomeWarning) as cm:
|
||
|
|
do_something()
|
||
|
|
the_warning = cm.warning
|
||
|
|
self.assertEqual(the_warning.some_attribute, 147)
|
||
|
|
"""
|
||
|
|
context = _AssertWarnsContext(expected_warning, self, callable_obj)
|
||
|
|
return context.handle('assertWarns', callable_obj, args, kwargs)
|
||
|
|
|
||
|
|
if not hasattr(unittest.TestCase, 'assertWarns'):
|
||
|
|
bind_method(unittest.TestCase, 'assertWarns', assertWarns)
|