+@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)
+def test_simple_format(filename: str) -> None:
+ check_file(filename, DEFAULT_MODE)
+
+
+@pytest.mark.parametrize("filename", PREVIEW_CASES)
+def test_preview_format(filename: str) -> None:
+ check_file(filename, black.Mode(preview=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))
+
+
+def test_remove_with_brackets() -> None:
+ source, expected = read_data("remove_with_brackets")
+ assert_format(
+ source,
+ expected,
+ black.Mode(preview=True),
+ minimum_version=(3, 9),
+ )
+
+
+@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_python_310_without_target_version() -> None:
+ source, expected = read_data("pattern_matching_simple")
+ mode = black.Mode()
+ 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_python_2_hint() -> None:
+ with pytest.raises(black.parsing.InvalidInput) as exc_info:
+ assert_format("print 'daylily'", "print 'daylily'")
+ exc_info.match(black.parsing.PY2_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)
+
+
+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))
+
+
+def test_power_op_newline() -> None:
+ # requires line_length=0
+ source, expected = read_data("power_op_newline")
+ assert_format(source, expected, mode=black.Mode(line_length=0))
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