#!/usr/bin/env python3
# --------------------( LICENSE                            )--------------------
# Copyright (c) 2014-2025 Beartype authors.
# See "LICENSE" for further details.

'''
Project-wide :pep:`557`-compliant **class-specific utility function** unit
tests.

This submodule unit tests the public API of the private
:mod:`beartype._util.cls.pep.utilpep557` submodule.
'''

# ....................{ IMPORTS                            }....................
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# WARNING: To raise human-readable test errors, avoid importing from
# package-specific submodules at module scope.
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

# ....................{ TESTS                              }....................
def test_is_type_pep557() -> None:
    '''
    Test the
    :func:`beartype._util.cls.pep.utilpep557.is_type_pep557` tester.
    '''

    # ....................{ IMPORTS                        }....................
    # Defer test-specific imports.
    from beartype.roar._roarexc import _BeartypeUtilTypeException
    from beartype._util.cls.pep.utilpep557 import is_type_pep557
    from dataclasses import dataclass
    from pytest import raises

    # ....................{ CLASSES                        }....................
    @dataclass
    class WhichTeachesAwfulDoubtOrFaithSoMild(object):
        '''
        Arbitrary dataclass.
        '''

        pass

    # ....................{ PASS                           }....................
    # Assert this tester returns true when passed a dataclass type.
    assert is_type_pep557(WhichTeachesAwfulDoubtOrFaithSoMild) is True

    # Assert this tester returns false when passed a non-dataclass type.
    assert is_type_pep557(str) is False

    # ....................{ FAIL                           }....................
    # Assert this tester raises the expected exception when passed a non-type.
    with raises(_BeartypeUtilTypeException):
        is_type_pep557('The wilderness has a mysterious tongue')
