public void CalculateBiggestProfit_WhenOneValidBuySellPairExists_ReturnsExpectedResult()
{
var priceData = new Dictionary <int, double?> {
{ 1, 10.1 },
{ 2, 20.02 },
{ 3, 30.02 },
{ 4, 10.1 }
};
string expectedResult = "1(10.1),3(30.02)";
string actualResult = Calculator.CalculateBiggestProfitFromPriceData(priceData);
Assert.That(actualResult, Is.EqualTo(expectedResult));
}