Function test_parser

mypy/test/test_nativeparse.py:70–111

Perform a single native parser test case. The argument contains the description of the test case.

(testcase: DataDrivenTestCase)

def test_parser(testcase: DataDrivenTestCase) -> None:
    """Perform a single native parser test case.

    The argument contains the description of the test case.
    """
    options = Options()
    options.hide_error_codes = True

    if testcase.file.endswith("python310.test"):
        options.python_version = (3, 10)
    elif testcase.file.endswith("python312.test"):
        options.python_version = (3, 12)
    elif testcase.file.endswith("python313.test"):
        options.python_version = (3, 13)
    elif testcase.file.endswith("python314.test"):
        options.python_version = (3, 14)
    else:
        options.python_version = defaults.PYTHON3_VERSION

    source = "\n".join(testcase.input)

    # Apply mypy: comments to options.
    comments = get_mypy_comments(source)
    changes, _ = parse_mypy_comments(comments, options)
    options = options.apply_changes(changes)

    # Check if we should skip function bodies (when ignoring errors)
    skip_function_bodies = "# mypy: ignore-errors=True" in source

    try:
        with temp_source(source) as fnam:
            node, errors, type_ignores = native_parse(fnam, options, skip_function_bodies)
            errors += load_tree(node, options)
            node.path = "main"
            a = node.str_with_options(options).split("\n")
            a = [format_error(err) for err in errors] + a
            a = [format_ignore(ignore) for ignore in type_ignores] + a
    except CompileError as e:
        a = e.messages
    assert_string_arrays_equal(
        testcase.output, a, f"Invalid parser output ({testcase.file}, line {testcase.line})"
    )


def format_error(err: ParseError) -> str: