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import importlib.util
import itertools
import os
import re
from collections import defaultdict
from typing import Optional
import pytest
try:
from mypy import api
except ImportError:
NO_MYPY = True
else:
NO_MYPY = False
DATA_DIR = os.path.join(os.path.dirname(__file__), "data")
PASS_DIR = os.path.join(DATA_DIR, "pass")
FAIL_DIR = os.path.join(DATA_DIR, "fail")
REVEAL_DIR = os.path.join(DATA_DIR, "reveal")
MYPY_INI = os.path.join(DATA_DIR, "mypy.ini")
CACHE_DIR = os.path.join(DATA_DIR, ".mypy_cache")
def get_test_cases(directory):
for root, _, files in os.walk(directory):
for fname in files:
if os.path.splitext(fname)[-1] == ".py":
fullpath = os.path.join(root, fname)
# Use relative path for nice py.test name
relpath = os.path.relpath(fullpath, start=directory)
yield pytest.param(
fullpath,
# Manually specify a name for the test
id=relpath,
)
@pytest.mark.slow
@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
@pytest.mark.parametrize("path", get_test_cases(PASS_DIR))
def test_success(path):
stdout, stderr, exitcode = api.run([
"--config-file",
MYPY_INI,
"--cache-dir",
CACHE_DIR,
path,
])
assert exitcode == 0, stdout
assert re.match(r"Success: no issues found in \d+ source files?", stdout.strip())
@pytest.mark.slow
@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
@pytest.mark.parametrize("path", get_test_cases(FAIL_DIR))
def test_fail(path):
__tracebackhide__ = True
stdout, stderr, exitcode = api.run([
"--config-file",
MYPY_INI,
"--cache-dir",
CACHE_DIR,
path,
])
assert exitcode != 0
with open(path) as fin:
lines = fin.readlines()
errors = defaultdict(lambda: "")
error_lines = stdout.rstrip("\n").split("\n")
assert re.match(
r"Found \d+ errors? in \d+ files? \(checked \d+ source files?\)",
error_lines[-1].strip(),
)
for error_line in error_lines[:-1]:
error_line = error_line.strip()
if not error_line:
continue
match = re.match(
r"^.+\.py:(?P<lineno>\d+): (error|note): .+$",
error_line,
)
if match is None:
raise ValueError(f"Unexpected error line format: {error_line}")
lineno = int(match.group('lineno'))
errors[lineno] += error_line
for i, line in enumerate(lines):
lineno = i + 1
if line.startswith('#') or (" E:" not in line and lineno not in errors):
continue
target_line = lines[lineno - 1]
if "# E:" in target_line:
marker = target_line.split("# E:")[-1].strip()
expected_error = errors.get(lineno)
_test_fail(path, marker, expected_error, lineno)
else:
pytest.fail(f"Error {repr(errors[lineno])} not found")
_FAIL_MSG1 = """Extra error at line {}
Extra error: {!r}
"""
_FAIL_MSG2 = """Error mismatch at line {}
Expected error: {!r}
Observed error: {!r}
"""
def _test_fail(path: str, error: str, expected_error: Optional[str], lineno: int) -> None:
if expected_error is None:
raise AssertionError(_FAIL_MSG1.format(lineno, error))
elif error not in expected_error:
raise AssertionError(_FAIL_MSG2.format(lineno, expected_error, error))
@pytest.mark.slow
@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
@pytest.mark.parametrize("path", get_test_cases(REVEAL_DIR))
def test_reveal(path):
__tracebackhide__ = True
stdout, stderr, exitcode = api.run([
"--config-file",
MYPY_INI,
"--cache-dir",
CACHE_DIR,
path,
])
with open(path) as fin:
lines = fin.read().replace('*', '').split("\n")
stdout_list = stdout.replace('*', '').split("\n")
for error_line in stdout_list:
error_line = error_line.strip()
if not error_line:
continue
match = re.match(
r"^.+\.py:(?P<lineno>\d+): note: .+$",
error_line,
)
if match is None:
raise ValueError(f"Unexpected reveal line format: {error_line}")
lineno = int(match.group('lineno')) - 1
assert "Revealed type is" in error_line
marker = lines[lineno].split("# E:")[-1].strip()
_test_reveal(path, marker, error_line, 1 + lineno)
_REVEAL_MSG = """Reveal mismatch at line {}
Expected reveal: {!r}
Observed reveal: {!r}
"""
def _test_reveal(path: str, reveal: str, expected_reveal: str, lineno: int) -> None:
if reveal not in expected_reveal:
raise AssertionError(_REVEAL_MSG.format(lineno, expected_reveal, reveal))
@pytest.mark.slow
@pytest.mark.skipif(NO_MYPY, reason="Mypy is not installed")
@pytest.mark.parametrize("path", get_test_cases(PASS_DIR))
def test_code_runs(path):
path_without_extension, _ = os.path.splitext(path)
dirname, filename = path.split(os.sep)[-2:]
spec = importlib.util.spec_from_file_location(f"{dirname}.{filename}", path)
test_module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(test_module)
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