Function test_parser

mypy/test/testparse.py:35–79

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

(testcase: DataDrivenTestCase)

def test_parser(testcase: DataDrivenTestCase) -> None:
    """Perform a single 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)

    try:
        errors = Errors(options)
        n = parse(
            bytes(source, "ascii"),
            fnam="main",
            module="__main__",
            errors=errors,
            options=options,
            file_exists=False,
            eager=True,
        )
        if errors.is_errors():
            errors.raise_error()
        a = n.str_with_options(options).split("\n")
    except CompileError as e:
        a = e.messages
    assert_string_arrays_equal(
        testcase.output, a, f"Invalid parser output ({testcase.file}, line {testcase.line})"
    )


# The file name shown in test case output. This is displayed in error