/
helpers.py
416 lines (324 loc) · 13.7 KB
/
helpers.py
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import os
import re
import subprocess
import sys
import time
import shutil
from typing import List, Iterable, Dict, Tuple, Callable, Any, Optional
from mypy import defaults
from mypy.test.config import test_temp_dir
import mypy.api as api
import pytest # type: ignore # no pytest in typeshed
# Exporting Suite as alias to TestCase for backwards compatibility
# TODO: avoid aliasing - import and subclass TestCase directly
from unittest import TestCase as Suite
from mypy.main import process_options
from mypy.options import Options
from mypy.test.data import DataDrivenTestCase
skip = pytest.mark.skip
# AssertStringArraysEqual displays special line alignment helper messages if
# the first different line has at least this many characters,
MIN_LINE_LENGTH_FOR_ALIGNMENT = 5
def run_mypy(args: List[str]) -> None:
__tracebackhide__ = True
outval, errval, status = api.run(args + ['--show-traceback',
'--no-site-packages',
'--no-silence-site-packages'])
if status != 0:
sys.stdout.write(outval)
sys.stderr.write(errval)
pytest.fail(msg="Sample check failed", pytrace=False)
def assert_string_arrays_equal(expected: List[str], actual: List[str],
msg: str) -> None:
"""Assert that two string arrays are equal.
We consider "can't" and "cannot" equivalent, by replacing the
former with the latter before comparing.
Display any differences in a human-readable form.
"""
actual = clean_up(actual)
actual = [line.replace("can't", "cannot") for line in actual]
expected = [line.replace("can't", "cannot") for line in expected]
if actual != expected:
num_skip_start = num_skipped_prefix_lines(expected, actual)
num_skip_end = num_skipped_suffix_lines(expected, actual)
sys.stderr.write('Expected:\n')
# If omit some lines at the beginning, indicate it by displaying a line
# with '...'.
if num_skip_start > 0:
sys.stderr.write(' ...\n')
# Keep track of the first different line.
first_diff = -1
# Display only this many first characters of identical lines.
width = 75
for i in range(num_skip_start, len(expected) - num_skip_end):
if i >= len(actual) or expected[i] != actual[i]:
if first_diff < 0:
first_diff = i
sys.stderr.write(' {:<45} (diff)'.format(expected[i]))
else:
e = expected[i]
sys.stderr.write(' ' + e[:width])
if len(e) > width:
sys.stderr.write('...')
sys.stderr.write('\n')
if num_skip_end > 0:
sys.stderr.write(' ...\n')
sys.stderr.write('Actual:\n')
if num_skip_start > 0:
sys.stderr.write(' ...\n')
for j in range(num_skip_start, len(actual) - num_skip_end):
if j >= len(expected) or expected[j] != actual[j]:
sys.stderr.write(' {:<45} (diff)'.format(actual[j]))
else:
a = actual[j]
sys.stderr.write(' ' + a[:width])
if len(a) > width:
sys.stderr.write('...')
sys.stderr.write('\n')
if actual == []:
sys.stderr.write(' (empty)\n')
if num_skip_end > 0:
sys.stderr.write(' ...\n')
sys.stderr.write('\n')
if first_diff >= 0 and first_diff < len(actual) and (
len(expected[first_diff]) >= MIN_LINE_LENGTH_FOR_ALIGNMENT
or len(actual[first_diff]) >= MIN_LINE_LENGTH_FOR_ALIGNMENT):
# Display message that helps visualize the differences between two
# long lines.
show_align_message(expected[first_diff], actual[first_diff])
raise AssertionError(msg)
def assert_module_equivalence(name: str,
expected: Optional[Iterable[str]], actual: Iterable[str]) -> None:
if expected is not None:
expected_normalized = sorted(expected)
actual_normalized = sorted(set(actual).difference({"__main__"}))
assert_string_arrays_equal(
expected_normalized,
actual_normalized,
('Actual modules ({}) do not match expected modules ({}) '
'for "[{} ...]"').format(
', '.join(actual_normalized),
', '.join(expected_normalized),
name))
def assert_target_equivalence(name: str,
expected: Optional[List[str]], actual: List[str]) -> None:
"""Compare actual and expected targets (order sensitive)."""
if expected is not None:
assert_string_arrays_equal(
expected,
actual,
('Actual targets ({}) do not match expected targets ({}) '
'for "[{} ...]"').format(
', '.join(actual),
', '.join(expected),
name))
def update_testcase_output(testcase: DataDrivenTestCase, output: List[str]) -> None:
assert testcase.old_cwd is not None, "test was not properly set up"
testcase_path = os.path.join(testcase.old_cwd, testcase.file)
with open(testcase_path, encoding='utf8') as f:
data_lines = f.read().splitlines()
test = '\n'.join(data_lines[testcase.line:testcase.lastline])
mapping = {} # type: Dict[str, List[str]]
for old, new in zip(testcase.output, output):
PREFIX = 'error:'
ind = old.find(PREFIX)
if ind != -1 and old[:ind] == new[:ind]:
old, new = old[ind + len(PREFIX):], new[ind + len(PREFIX):]
mapping.setdefault(old, []).append(new)
for old in mapping:
if test.count(old) == len(mapping[old]):
betweens = test.split(old)
# Interleave betweens and mapping[old]
from itertools import chain
interleaved = [betweens[0]] + \
list(chain.from_iterable(zip(mapping[old], betweens[1:])))
test = ''.join(interleaved)
data_lines[testcase.line:testcase.lastline] = [test]
data = '\n'.join(data_lines)
with open(testcase_path, 'w', encoding='utf8') as f:
print(data, file=f)
def show_align_message(s1: str, s2: str) -> None:
"""Align s1 and s2 so that the their first difference is highlighted.
For example, if s1 is 'foobar' and s2 is 'fobar', display the
following lines:
E: foobar
A: fobar
^
If s1 and s2 are long, only display a fragment of the strings around the
first difference. If s1 is very short, do nothing.
"""
# Seeing what went wrong is trivial even without alignment if the expected
# string is very short. In this case do nothing to simplify output.
if len(s1) < 4:
return
maxw = 72 # Maximum number of characters shown
sys.stderr.write('Alignment of first line difference:\n')
trunc = False
while s1[:30] == s2[:30]:
s1 = s1[10:]
s2 = s2[10:]
trunc = True
if trunc:
s1 = '...' + s1
s2 = '...' + s2
max_len = max(len(s1), len(s2))
extra = ''
if max_len > maxw:
extra = '...'
# Write a chunk of both lines, aligned.
sys.stderr.write(' E: {}{}\n'.format(s1[:maxw], extra))
sys.stderr.write(' A: {}{}\n'.format(s2[:maxw], extra))
# Write an indicator character under the different columns.
sys.stderr.write(' ')
for j in range(min(maxw, max(len(s1), len(s2)))):
if s1[j:j + 1] != s2[j:j + 1]:
sys.stderr.write('^') # Difference
break
else:
sys.stderr.write(' ') # Equal
sys.stderr.write('\n')
def clean_up(a: List[str]) -> List[str]:
"""Remove common directory prefix from all strings in a.
This uses a naive string replace; it seems to work well enough. Also
remove trailing carriage returns.
"""
res = []
for s in a:
prefix = os.sep
ss = s
for p in prefix, prefix.replace(os.sep, '/'):
if p != '/' and p != '//' and p != '\\' and p != '\\\\':
ss = ss.replace(p, '')
# Ignore spaces at end of line.
ss = re.sub(' +$', '', ss)
res.append(re.sub('\\r$', '', ss))
return res
def num_skipped_prefix_lines(a1: List[str], a2: List[str]) -> int:
num_eq = 0
while num_eq < min(len(a1), len(a2)) and a1[num_eq] == a2[num_eq]:
num_eq += 1
return max(0, num_eq - 4)
def num_skipped_suffix_lines(a1: List[str], a2: List[str]) -> int:
num_eq = 0
while (num_eq < min(len(a1), len(a2))
and a1[-num_eq - 1] == a2[-num_eq - 1]):
num_eq += 1
return max(0, num_eq - 4)
def testfile_pyversion(path: str) -> Tuple[int, int]:
if path.endswith('python2.test'):
return defaults.PYTHON2_VERSION
else:
return defaults.PYTHON3_VERSION
def testcase_pyversion(path: str, testcase_name: str) -> Tuple[int, int]:
if testcase_name.endswith('python2'):
return defaults.PYTHON2_VERSION
else:
return testfile_pyversion(path)
def normalize_error_messages(messages: List[str]) -> List[str]:
"""Translate an array of error messages to use / as path separator."""
a = []
for m in messages:
a.append(m.replace(os.sep, '/'))
return a
def retry_on_error(func: Callable[[], Any], max_wait: float = 1.0) -> None:
"""Retry callback with exponential backoff when it raises OSError.
If the function still generates an error after max_wait seconds, propagate
the exception.
This can be effective against random file system operation failures on
Windows.
"""
t0 = time.time()
wait_time = 0.01
while True:
try:
func()
return
except OSError:
wait_time = min(wait_time * 2, t0 + max_wait - time.time())
if wait_time <= 0.01:
# Done enough waiting, the error seems persistent.
raise
time.sleep(wait_time)
# TODO: assert_true and assert_false are redundant - use plain assert
def assert_true(b: bool, msg: Optional[str] = None) -> None:
if not b:
raise AssertionError(msg)
def assert_false(b: bool, msg: Optional[str] = None) -> None:
if b:
raise AssertionError(msg)
def good_repr(obj: object) -> str:
if isinstance(obj, str):
if obj.count('\n') > 1:
bits = ["'''\\"]
for line in obj.split('\n'):
# force repr to use ' not ", then cut it off
bits.append(repr('"' + line)[2:-1])
bits[-1] += "'''"
return '\n'.join(bits)
return repr(obj)
def assert_equal(a: object, b: object, fmt: str = '{} != {}') -> None:
if a != b:
raise AssertionError(fmt.format(good_repr(a), good_repr(b)))
def typename(t: type) -> str:
if '.' in str(t):
return str(t).split('.')[-1].rstrip("'>")
else:
return str(t)[8:-2]
def assert_type(typ: type, value: object) -> None:
if type(value) != typ:
raise AssertionError('Invalid type {}, expected {}'.format(
typename(type(value)), typename(typ)))
def parse_options(program_text: str, testcase: DataDrivenTestCase,
incremental_step: int) -> Options:
"""Parse comments like '# flags: --foo' in a test case."""
options = Options()
flags = re.search('# flags: (.*)$', program_text, flags=re.MULTILINE)
if incremental_step > 1:
flags2 = re.search('# flags{}: (.*)$'.format(incremental_step), program_text,
flags=re.MULTILINE)
if flags2:
flags = flags2
flag_list = None
if flags:
flag_list = flags.group(1).split()
flag_list.append('--no-site-packages') # the tests shouldn't need an installed Python
targets, options = process_options(flag_list, require_targets=False)
if targets:
# TODO: support specifying targets via the flags pragma
raise RuntimeError('Specifying targets via the flags pragma is not supported.')
else:
options = Options()
# TODO: Enable strict optional in test cases by default (requires *many* test case changes)
options.strict_optional = False
# Allow custom python version to override testcase_pyversion
if (not flag_list or
all(flag not in flag_list for flag in ['--python-version', '-2', '--py2'])):
options.python_version = testcase_pyversion(testcase.file, testcase.name)
if testcase.config.getoption('--mypy-verbose'):
options.verbosity = testcase.config.getoption('--mypy-verbose')
if os.getenv('NEWSEMANAL'):
if not flag_list or '--no-new-semantic-analyzer' not in flag_list:
options.new_semantic_analyzer = True
return options
def split_lines(*streams: bytes) -> List[str]:
"""Returns a single list of string lines from the byte streams in args."""
return [
s
for stream in streams
for s in stream.decode('utf8').splitlines()
]
def copy_and_fudge_mtime(source_path: str, target_path: str) -> None:
# In some systems, mtime has a resolution of 1 second which can
# cause annoying-to-debug issues when a file has the same size
# after a change. We manually set the mtime to circumvent this.
# Note that we increment the old file's mtime, which guarentees a
# different value, rather than incrementing the mtime after the
# copy, which could leave the mtime unchanged if the old file had
# a similarly fudged mtime.
new_time = None
if os.path.isfile(target_path):
new_time = os.stat(target_path).st_mtime + 1
# Use retries to work around potential flakiness on Windows (AppVeyor).
retry_on_error(lambda: shutil.copy(source_path, target_path))
if new_time:
os.utime(target_path, times=(new_time, new_time))