public void ParseInput_InCorrectDateArgs_ReturnsException(string inputArgument)
{
Assert.Throws <FormatException>(() => RangeCalculatorProgram.ParseInput(inputArgument));
}
public void ParseInput_CorrectDateArgs_ReturnsParsedDate(string inputArgument)
{
var result = RangeCalculatorProgram.ParseInput(inputArgument);
Assert.IsInstanceOf <DateTime>(result);
}