def test_is_null_or_whitespace_throws_error_on_invalid_value(value: str):
"""
Tests that the `is_not_null_or_whitespace()` method throws an ArgumentError
when it is supplied with an invalid value.
"""
# Arrange
validator = StringValidator(value, 'value')
# Assert
with pytest.raises(ArgumentError):
# Act
validator.is_null_or_whitespace()
def test_is_null_or_whitespace_accepts_whitespace_value():
"""
Tests that the `is_not_null_or_whitespace()` method does not throw an ArgumentError
when it is supplied with a whitespace value.
"""
# Arrange
value = WHITESPACE_STRING
validator = StringValidator(value, 'value')
# Act
try:
validator.is_null_or_whitespace()
# Assert
except ArgumentError:
pytest.fail(f'`{value}` should have been None (Null), empty or whitespace, but an error occurred instead.')
def test_is_null_or_whitespace_returns_validator_self():
"""
Tests if the `is_null_or_whitespace()` validator method returns itself after the validation is performed,
so that additional validations can be performed.
"""
# Arrange
value = WHITESPACE_STRING
validator = StringValidator(value, 'value')
# Act
validator_returned = validator.is_null_or_whitespace()
# Assert
assert validator_returned is validator