public void AddClass_AcceptableClass_AddsClassSuccessfully() { // Arrange var acceptableClass = new Class { Day = DayOfWeek.Monday, EndTime = DateTime.Parse("12:00 PM"), Instructors = "Mary Joe", Location = "Mendel 154", Name = "CSC 1210", Section = "001", StartTime = DateTime.Parse("8:05 AM"), Title = "Introduction to Programming with Java" }; const int addedClassCount = 1; int expectedClassesCount = _timeSlot.OccupiedSpacesCount + addedClassCount; // Act _timeSlot.AddClass(acceptableClass); int actualClassesCount = _timeSlot.OccupiedSpacesCount; // Assert Assert.Equal(expectedClassesCount, actualClassesCount); }