public void FormatTime_ReturnsCorrectFormat(string input, string expected)
{
//Arrange
Concert concert = GetEmptyConcert();
DateTime dateTime = DateTime.ParseExact(input, "yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
//Act
string result = concert.FormatTime(dateTime);
//Assert
Assert.Equal(expected, result);
}
