def test_is_of_type_throws_error_on_different_type():
"""
Tests that the `is_of_type()` method throws an ArgumentError
when it is supplied with a type that is different to the specified type.
"""
# Arrange
obj = TypeExample()
validator = ObjectValidator(obj, 'obj')
# Assert
with pytest.raises(ArgumentError):
# Act
validator.is_of_type(TypeExample2)
def test_is_of_type_throws_error_on_no_supplied_type_class():
"""
Tests that the `is_of_type()` method does not throw a TypeError
when it is supplied with a type that is initialized rather than a class type.
"""
# Arrange
actual = type('type', (object,), {})()
expected = type('type', (object,), {})()
validator = ObjectValidator(actual, 'actual')
# Assert
with pytest.raises(TypeError):
# Act
validator.is_of_type(expected)
def test_is_of_type_skips_check_if_value_is_none():
"""
Tests that the `is_of_type()` skips the type check if the specified value is `None`.
"""
# Arrange
obj = None
validator = ObjectValidator(obj, 'obj')
# Act
try:
validator.is_of_type(TypeExample)
# Assert
except ArgumentError:
pytest.fail(f'Type `{obj.__class__.__name__}` should match type `{TypeExample.__name__}`, but an error occurred.')
def test_is_of_type_accepts_equivalent_type():
"""
Tests that the `is_of_type()` method does not throw an ArgumentError
when it is supplied with a type that is equivalent to the specified type.
"""
# Arrange
obj = TypeExample()
validator = ObjectValidator(obj, 'obj')
# Act
try:
validator.is_of_type(TypeExample)
# Assert
except ArgumentError:
pytest.fail(f'Type `{obj.__class__.__name__}` should match type `{TypeExample.__name__}`, but an error occurred.')
def test_is_of_type_returns_validator_self():
"""
Tests if the `is_of_type()` validator method returns itself after the validation is performed,
so that additional validations can be performed.
"""
# Arrange
obj = TypeExample()
validator = ObjectValidator(obj, 'obj')
# Act
validator_returned = validator.is_of_type(TypeExample)
# Assert
assert validator_returned is validator