public void CreateWorkOrderValidationTests_ObjectNumber() { // error values _validator.ShouldHaveValidationErrorFor(x => x.ObjectNumber, null as string); _validator.ShouldHaveValidationErrorFor(x => x.ObjectNumber, string.Empty); // non-error values _validator.ShouldNotHaveValidationErrorFor(x => x.ObjectNumber, "B1"); _validator.ShouldNotHaveValidationErrorFor(x => x.ObjectNumber, "B12"); _validator.ShouldNotHaveValidationErrorFor(x => x.ObjectNumber, "B123"); }