public void AddDepartmentTest() { List <IDepartment> departments = _dataContext.GetAllDepartments(); int departmentsNum = departments.Count; Department testDepartment = new Department(20, "testDep", "testDepGroup", DateTime.Now); Assert.IsFalse(departments.Contains(testDepartment)); _dataContext.AddDepartment(testDepartment); departments = _dataContext.GetAllDepartments(); Assert.AreEqual(departmentsNum + 1, departments.Count); Assert.IsTrue(departments.Contains(testDepartment)); }