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base.py
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from __future__ import print_function, absolute_import import os import tempfile import unittest import sys import re import warnings import io from textwrap import dedent from future.utils import bind_method, PY26, PY3, PY2, PY27 from future.moves.subprocess import check_output, STDOUT, CalledProcessError if PY26: import unittest2 as unittest def reformat_code(code): """ Removes any leading \n and dedents. """ if code.startswith('\n'): code = code[1:] return dedent(code) def order_future_lines(code): """ Returns the code block with any ``__future__`` import lines sorted, and then any ``future`` import lines sorted, then any ``builtins`` import lines sorted. This only sorts the lines within the expected blocks. See test_order_future_lines() for an example. """ # We need .splitlines(keepends=True), which doesn't exist on Py2, # so we use this instead: lines = code.split('\n') uufuture_line_numbers = [i for i, line in enumerate(lines) if line.startswith('from __future__ import ')] future_line_numbers = [i for i, line in enumerate(lines) if line.startswith('from future') or line.startswith('from past')] builtins_line_numbers = [i for i, line in enumerate(lines) if line.startswith('from builtins')] assert code.lstrip() == code, ('internal usage error: ' 'dedent the code before calling order_future_lines()') def mymax(numbers): return max(numbers) if len(numbers) > 0 else 0 def mymin(numbers): return min(numbers) if len(numbers) > 0 else float('inf') assert mymax(uufuture_line_numbers) <= mymin(future_line_numbers), \ 'the __future__ and future imports are out of order' # assert mymax(future_line_numbers) <= mymin(builtins_line_numbers), \ # 'the future and builtins imports are out of order' uul = sorted([lines[i] for i in uufuture_line_numbers]) sorted_uufuture_lines = dict(zip(uufuture_line_numbers, uul)) fl = sorted([lines[i] for i in future_line_numbers]) sorted_future_lines = dict(zip(future_line_numbers, fl)) bl = sorted([lines[i] for i in builtins_line_numbers]) sorted_builtins_lines = dict(zip(builtins_line_numbers, bl)) # Replace the old unsorted "from __future__ import ..." lines with the # new sorted ones: new_lines = [] for i in range(len(lines)): if i in uufuture_line_numbers: new_lines.append(sorted_uufuture_lines[i]) elif i in future_line_numbers: new_lines.append(sorted_future_lines[i]) elif i in builtins_line_numbers: new_lines.append(sorted_builtins_lines[i]) else: new_lines.append(lines[i]) return '\n'.join(new_lines) class VerboseCalledProcessError(CalledProcessError): """ Like CalledProcessError, but it displays more information (message and script output) for diagnosing test failures etc. """ def __init__(self, msg, returncode, cmd, output=None): self.msg = msg self.returncode = returncode self.cmd = cmd self.output = output def __str__(self): return ("Command '%s' failed with exit status %d\nMessage: %s\nOutput: %s" % (self.cmd, self.returncode, self.msg, self.output)) class FuturizeError(VerboseCalledProcessError): pass class PasteurizeError(VerboseCalledProcessError): pass class CodeHandler(unittest.TestCase): """ Handy mixin for test classes for writing / reading / futurizing / running .py files in the test suite. """ def setUp(self): """ The outputs from the various futurize stages should have the following headers: """ # After stage1: # TODO: use this form after implementing a fixer to consolidate # __future__ imports into a single line: # self.headers1 = """ # from __future__ import absolute_import, division, print_function # """ self.headers1 = reformat_code(""" from __future__ import absolute_import from __future__ import division from __future__ import print_function """) # After stage2 --all-imports: # TODO: use this form after implementing a fixer to consolidate # __future__ imports into a single line: # self.headers2 = """ # from __future__ import (absolute_import, division, # print_function, unicode_literals) # from future import standard_library # from future.builtins import * # """ self.headers2 = reformat_code(""" from __future__ import absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals from future import standard_library standard_library.install_aliases() from builtins import * """) self.interpreters = [sys.executable] self.tempdir = tempfile.mkdtemp() + os.path.sep pypath = os.getenv('PYTHONPATH') if pypath: self.env = {'PYTHONPATH': os.getcwd() + os.pathsep + pypath} else: self.env = {'PYTHONPATH': os.getcwd()} def convert(self, code, stages=(1, 2), all_imports=False, from3=False, reformat=True, run=True, conservative=False): """ Converts the code block using ``futurize`` and returns the resulting code. Passing stages=[1] or stages=[2] passes the flag ``--stage1`` or ``stage2`` to ``futurize``. Passing both stages runs ``futurize`` with both stages by default. If from3 is False, runs ``futurize``, converting from Python 2 to both 2 and 3. If from3 is True, runs ``pasteurize`` to convert from Python 3 to both 2 and 3. Optionally reformats the code block first using the reformat() function. If run is True, runs the resulting code under all Python interpreters in self.interpreters. """ if reformat: code = reformat_code(code) self._write_test_script(code) self._futurize_test_script(stages=stages, all_imports=all_imports, from3=from3, conservative=conservative) output = self._read_test_script() if run: for interpreter in self.interpreters: _ = self._run_test_script(interpreter=interpreter) return output def compare(self, output, expected, ignore_imports=True): """ Compares whether the code blocks are equal. If not, raises an exception so the test fails. Ignores any trailing whitespace like blank lines. If ignore_imports is True, passes the code blocks into the strip_future_imports method. If one code block is a unicode string and the other a byte-string, it assumes the byte-string is encoded as utf-8. """ if ignore_imports: output = self.strip_future_imports(output) expected = self.strip_future_imports(expected) if isinstance(output, bytes) and not isinstance(expected, bytes): output = output.decode('utf-8') if isinstance(expected, bytes) and not isinstance(output, bytes): expected = expected.decode('utf-8') self.assertEqual(order_future_lines(output.rstrip()), expected.rstrip()) def strip_future_imports(self, code): """ Strips any of these import lines: from __future__ import <anything> from future <anything> from future.<anything> from builtins <anything> or any line containing: install_hooks() or: install_aliases() Limitation: doesn't handle imports split across multiple lines like this: from __future__ import (absolute_import, division, print_function, unicode_literals) """ output = [] # We need .splitlines(keepends=True), which doesn't exist on Py2, # so we use this instead: for line in code.split('\n'): if not (line.startswith('from __future__ import ') or line.startswith('from future ') or line.startswith('from builtins ') or 'install_hooks()' in line or 'install_aliases()' in line # but don't match "from future_builtins" :) or line.startswith('from future.')): output.append(line) return '\n'.join(output) def convert_check(self, before, expected, stages=(1, 2), all_imports=False, ignore_imports=True, from3=False, run=True, conservative=False): """ Convenience method that calls convert() and compare(). Reformats the code blocks automatically using the reformat_code() function. If all_imports is passed, we add the appropriate import headers for the stage(s) selected to the ``expected`` code-block, so they needn't appear repeatedly in the test code. If ignore_imports is True, ignores the presence of any lines beginning: from __future__ import ... from future import ... for the purpose of the comparison. """ output = self.convert(before, stages=stages, all_imports=all_imports, from3=from3, run=run, conservative=conservative) if all_imports: headers = self.headers2 if 2 in stages else self.headers1 else: headers = '' self.compare(output, headers + reformat_code(expected), ignore_imports=ignore_imports) def unchanged(self, code, **kwargs): """ Convenience method to ensure the code is unchanged by the futurize process. """ self.convert_check(code, code, **kwargs) def _write_test_script(self, code, filename='mytestscript.py'): """ Dedents the given code (a multiline string) and writes it out to a file in a temporary folder like /tmp/tmpUDCn7x/mytestscript.py. """ if isinstance(code, bytes): code = code.decode('utf-8') # Be explicit about encoding the temp file as UTF-8 (issue #63): with io.open(self.tempdir + filename, 'wt', encoding='utf-8') as f: f.write(dedent(code)) def _read_test_script(self, filename='mytestscript.py'): with io.open(self.tempdir + filename, 'rt', encoding='utf-8') as f: newsource = f.read() return newsource def _futurize_test_script(self, filename='mytestscript.py', stages=(1, 2), all_imports=False, from3=False, conservative=False): params = [] stages = list(stages) if all_imports: params.append('--all-imports') if from3: script = 'pasteurize.py' else: script = 'futurize.py' if stages == [1]: params.append('--stage1') elif stages == [2]: params.append('--stage2') else: assert stages == [1, 2] if conservative: params.append('--conservative') # No extra params needed # Absolute file path: fn = self.tempdir + filename call_args = [sys.executable, script] + params + ['-w', fn] try: output = check_output(call_args, stderr=STDOUT, env=self.env) except CalledProcessError as e: with open(fn) as f: msg = ( 'Error running the command %s\n' '%s\n' 'Contents of file %s:\n' '\n' '%s') % ( ' '.join(call_args), 'env=%s' % self.env, fn, '----\n%s\n----' % f.read(), ) ErrorClass = (FuturizeError if 'futurize' in script else PasteurizeError) raise ErrorClass(msg, e.returncode, e.cmd, output=e.output) return output def _run_test_script(self, filename='mytestscript.py', interpreter=sys.executable): # Absolute file path: fn = self.tempdir + filename try: output = check_output([interpreter, fn], env=self.env, stderr=STDOUT) except CalledProcessError as e: with open(fn) as f: msg = ( 'Error running the command %s\n' '%s\n' 'Contents of file %s:\n' '\n' '%s') % ( ' '.join([interpreter, fn]), 'env=%s' % self.env, fn, '----\n%s\n----' % f.read(), ) if not hasattr(e, 'output'): # The attribute CalledProcessError.output doesn't exist on Py2.6 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)
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