public void ShouldBuiltDateReturnGoodValueForDefault() { //Arrange var firstDate = new DateTime(2000, 1, 1); var secondDate = new DateTime(2021, 5, 14); const string expedtedDateString = "01.01.2000 - 14.05.2021"; var builder = new DefaultBuilder(); //Act var actualOutput = builder.BuildDate(firstDate, secondDate); //Assert Assert.Equal(expedtedDateString, actualOutput); }