/
test_format.py
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/
test_format.py
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from dataclasses import replace
from typing import Any, Iterator
from unittest.mock import patch
import pytest
import black
from tests.util import (
DEFAULT_MODE,
PY36_VERSIONS,
THIS_DIR,
assert_format,
dump_to_stderr,
read_data,
)
SIMPLE_CASES = [
"beginning_backslash",
"bracketmatch",
"class_blank_parentheses",
"class_methods_new_line",
"collections",
"comments",
"comments2",
"comments3",
"comments4",
"comments5",
"comments6",
"comments_non_breaking_space",
"comment_after_escaped_newline",
"composition",
"composition_no_trailing_comma",
"docstring",
"empty_lines",
"expression",
"fmtonoff",
"fmtonoff2",
"fmtonoff3",
"fmtonoff4",
"fmtskip",
"fmtskip2",
"fmtskip3",
"fmtskip4",
"fmtskip5",
"fmtskip6",
"fstring",
"function",
"function2",
"function_trailing_comma",
"import_spacing",
"remove_parens",
"slices",
"string_prefixes",
"tricky_unicode_symbols",
"tupleassign",
]
SIMPLE_CASES_PY2 = [
"numeric_literals_py2",
"python2",
"python2_unicode_literals",
]
EXPERIMENTAL_STRING_PROCESSING_CASES = [
"cantfit",
"comments7",
"long_strings",
"long_strings__edge_case",
"long_strings__regression",
"percent_precedence",
]
PY310_CASES = [
"pattern_matching_simple",
"pattern_matching_complex",
"pattern_matching_extras",
"pattern_matching_style",
"pattern_matching_generic",
"parenthesized_context_managers",
]
SOURCES = [
"src/black/__init__.py",
"src/black/__main__.py",
"src/black/brackets.py",
"src/black/cache.py",
"src/black/comments.py",
"src/black/concurrency.py",
"src/black/const.py",
"src/black/debug.py",
"src/black/files.py",
"src/black/linegen.py",
"src/black/lines.py",
"src/black/mode.py",
"src/black/nodes.py",
"src/black/numerics.py",
"src/black/output.py",
"src/black/parsing.py",
"src/black/report.py",
"src/black/rusty.py",
"src/black/strings.py",
"src/black/trans.py",
"src/blackd/__init__.py",
"src/black_primer/cli.py",
"src/black_primer/lib.py",
"src/blib2to3/pygram.py",
"src/blib2to3/pytree.py",
"src/blib2to3/pgen2/conv.py",
"src/blib2to3/pgen2/driver.py",
"src/blib2to3/pgen2/grammar.py",
"src/blib2to3/pgen2/literals.py",
"src/blib2to3/pgen2/parse.py",
"src/blib2to3/pgen2/pgen.py",
"src/blib2to3/pgen2/tokenize.py",
"src/blib2to3/pgen2/token.py",
"setup.py",
"tests/test_black.py",
"tests/test_blackd.py",
"tests/test_format.py",
"tests/test_primer.py",
"tests/optional.py",
"tests/util.py",
"tests/conftest.py",
]
@pytest.fixture(autouse=True)
def patch_dump_to_file(request: Any) -> Iterator[None]:
with patch("black.dump_to_file", dump_to_stderr):
yield
def check_file(filename: str, mode: black.Mode, *, data: bool = True) -> None:
source, expected = read_data(filename, data=data)
assert_format(source, expected, mode, fast=False)
@pytest.mark.parametrize("filename", SIMPLE_CASES_PY2)
@pytest.mark.python2
def test_simple_format_py2(filename: str) -> None:
check_file(filename, DEFAULT_MODE)
@pytest.mark.parametrize("filename", SIMPLE_CASES)
def test_simple_format(filename: str) -> None:
check_file(filename, DEFAULT_MODE)
@pytest.mark.parametrize("filename", EXPERIMENTAL_STRING_PROCESSING_CASES)
def test_experimental_format(filename: str) -> None:
check_file(filename, black.Mode(experimental_string_processing=True))
@pytest.mark.parametrize("filename", SOURCES)
def test_source_is_formatted(filename: str) -> None:
path = THIS_DIR.parent / filename
check_file(str(path), DEFAULT_MODE, data=False)
# =============== #
# Complex cases
# ============= #
def test_empty() -> None:
source = expected = ""
assert_format(source, expected)
def test_pep_572() -> None:
source, expected = read_data("pep_572")
assert_format(source, expected, minimum_version=(3, 8))
def test_pep_572_remove_parens() -> None:
source, expected = read_data("pep_572_remove_parens")
assert_format(source, expected, minimum_version=(3, 8))
def test_pep_572_do_not_remove_parens() -> None:
source, expected = read_data("pep_572_do_not_remove_parens")
# the AST safety checks will fail, but that's expected, just make sure no
# parentheses are touched
assert_format(source, expected, fast=True)
@pytest.mark.parametrize("major, minor", [(3, 9), (3, 10)])
def test_pep_572_newer_syntax(major: int, minor: int) -> None:
source, expected = read_data(f"pep_572_py{major}{minor}")
assert_format(source, expected, minimum_version=(major, minor))
def test_pep_570() -> None:
source, expected = read_data("pep_570")
assert_format(source, expected, minimum_version=(3, 8))
@pytest.mark.parametrize("filename", PY310_CASES)
def test_python_310(filename: str) -> None:
source, expected = read_data(filename)
mode = black.Mode(target_versions={black.TargetVersion.PY310})
assert_format(source, expected, mode, minimum_version=(3, 10))
def test_patma_invalid() -> None:
source, expected = read_data("pattern_matching_invalid")
mode = black.Mode(target_versions={black.TargetVersion.PY310})
with pytest.raises(black.parsing.InvalidInput) as exc_info:
assert_format(source, expected, mode, minimum_version=(3, 10))
exc_info.match("Cannot parse: 10:11")
def test_patma_hint() -> None:
source, expected = read_data("pattern_matching_simple")
mode = black.Mode(target_versions={black.TargetVersion.PY39})
with pytest.raises(black.parsing.InvalidInput) as exc_info:
assert_format(source, expected, mode, minimum_version=(3, 10))
exc_info.match(black.parsing.PY310_HINT)
def test_docstring_no_string_normalization() -> None:
"""Like test_docstring but with string normalization off."""
source, expected = read_data("docstring_no_string_normalization")
mode = replace(DEFAULT_MODE, string_normalization=False)
assert_format(source, expected, mode)
def test_long_strings_flag_disabled() -> None:
"""Tests for turning off the string processing logic."""
source, expected = read_data("long_strings_flag_disabled")
mode = replace(DEFAULT_MODE, experimental_string_processing=False)
assert_format(source, expected, mode)
def test_numeric_literals() -> None:
source, expected = read_data("numeric_literals")
mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
assert_format(source, expected, mode)
def test_numeric_literals_ignoring_underscores() -> None:
source, expected = read_data("numeric_literals_skip_underscores")
mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)
assert_format(source, expected, mode)
@pytest.mark.python2
def test_python2_print_function() -> None:
source, expected = read_data("python2_print_function")
mode = replace(DEFAULT_MODE, target_versions={black.TargetVersion.PY27})
assert_format(source, expected, mode)
def test_stub() -> None:
mode = replace(DEFAULT_MODE, is_pyi=True)
source, expected = read_data("stub.pyi")
assert_format(source, expected, mode)
def test_python38() -> None:
source, expected = read_data("python38")
assert_format(source, expected, minimum_version=(3, 8))
def test_python39() -> None:
source, expected = read_data("python39")
assert_format(source, expected, minimum_version=(3, 9))