public void CodeIsNull()
        {
            // Arrange
            var validator = new PostalCodeValidator(null, codeService);

            //Act
            validator.Validate(controller.ModelState);

            // Assert
            controller.ModelState.IsValid.Should().BeTrue();
        }
        public void CodeNotExistsCodeServiceReturnsEmpty()
        {
            // Arrange
            codeServiceMockSetup.Setup(c => c.GetPostalCodeByCode(It.IsAny <string>(), false)).Returns(string.Empty);
            var validator = new PostalCodeValidator("code", codeServiceMockSetup.Object);

            //Act
            validator.Validate(controller.ModelState);

            // Assert
            controller.ModelState.IsValid.Should().BeFalse();
        }