def test_contains_throw_error_on_invalid_value(value: str, contains: str):
"""
Tests that the `contains()` method throws an ArgumentError
when the value does not contain specified value.
"""
# Arrange
validator = StringValidator(value, 'value')
# Assert
with pytest.raises(ArgumentError):
# Act
validator.contains(contains)
def test_contains_accepts_valid_value(value: str, contains: str):
"""
Tests that the `contains()` method does not throw an ArgumentError
when the value does contains specified value.
"""
# Arrange
validator = StringValidator(value, 'value')
# Act
try:
validator.contains(contains)
# Assert
except ArgumentError:
pytest.fail(f'`{value}` should contain `{contains}`, but an error occurred.')
def test_contains_returns_validator_self():
"""
Tests if the `contains()` validator method returns itself after the validation is performed,
so that additional validations can be performed.
"""
# Arrange
value = 'Hello World'
contains = 'ello'
validator = StringValidator(value, 'value')
# Act
validator_returned = validator.contains(contains)
# Assert
assert validator_returned is validator