public void BugService_IsValid_return_false_when_name_is_empty() { var bug = new Domain.Entity.Bug(); var errorMessages = new List <string>(); var expected = _bugService.IsValid(bug, out errorMessages); Assert.IsFalse(expected); Assert.IsTrue(errorMessages.Any()); Assert.AreEqual("the name of the bug cannot be empty", errorMessages[0]); }