public void Given_a_null_builder_When_Create_is_called_Then_an_AgrumentNullException_should_be_thrown() { // Arrange. PagedEnumerableMetadataBuilder builder = null; // Act. Action testCode = () => PagedEnumerableMetadata.Create(builder); // Assert. testCode.Should() .Throw <ArgumentNullException>() .WithMessage("*cannot be null*builder*"); }