public void ValidChangeSumShouldBeCalculate()
{
var input = new Dictionary<decimal, int>();
input.Add(10m, 1);
var calculator = new ChangeCalculator();
var result = calculator.Calculate(input, 10);
Assert.AreEqual(1, result.Count);
Assert.AreEqual(1, result[10m]);
input.Add(5m, 10);
input.Add(2m, 10);
input.Add(1m, 10);
result = calculator.Calculate(input, 18);
Assert.AreEqual(4, result.Count);
Assert.AreEqual(1, result[10m]);
Assert.AreEqual(1, result[5m]);
Assert.AreEqual(1, result[2m]);
Assert.AreEqual(1, result[1m]);
input = new Dictionary<decimal, int>
{
{ 10m, 1 },
{ 1m, 9 },
{ 0.1m, 10 }
};
result = calculator.Calculate(input, 9.4m);
Assert.AreEqual(2, result.Count);
Assert.AreEqual(9, result[1m]);
Assert.AreEqual(4, result[0.1m]);
input = new Dictionary<decimal, int>
{
{ 10m, 10 },
{ 5m, 9 },
{ 3m, 10 }
};
result = calculator.Calculate(input, 18m);
Assert.AreEqual(3, result.Count);
Assert.AreEqual(1, result[3m]);
Assert.AreEqual(1, result[5m]);
Assert.AreEqual(1, result[10m]);
input = new Dictionary<decimal, int>
{
{ 10m, 10 },
{ 4m, 9 },
{ 3m, 10 }
};
result = calculator.Calculate(input, 15m);
Assert.AreEqual(2, result.Count);
Assert.AreEqual(1, result[3m]);
Assert.AreEqual(3, result[4m]);
}
public void EmptyDictionaryShouldBeReturnedIsCalculationIsImpossible()
{
var input = new Dictionary<decimal, int>();
var calculator = new ChangeCalculator();
var result = calculator.Calculate(input, 0);
Assert.AreEqual(0, result.Count, "Empty dictionary is expected if sum is 0");
input.Add(10m, 1);
result = calculator.Calculate(input, 11);
Assert.AreEqual(0, result.Count, "Empty dictionary is expected if not enough values");
input.Add(2m, 10);
result = calculator.Calculate(input, 11);
Assert.AreEqual(0, result.Count, "Empty dictionary is expected if it is impossible to calc a change");
}
public void Calculate_ValidChange_Test()
{
ChangeCalculator changeCalculator = new ChangeCalculator();
CalculateRequest request = new CalculateRequest();
request.ProductAmount = 1000;
request.PaidAmount = 2576;
//uint expected100Bills = 0;
//uint expected50Bills = 0;
//uint expected20Bills = 0;
uint expected10Bills = 1;
uint expected5Bills = 1;
//uint expected2Bills = 0;
//uint expected100Coins = 15;
uint expected50Coins = 1;
uint expected25Coins = 1;
uint expected1Coins = 1;
CalculateResponse response = changeCalculator.Calculate(request);
Assert.IsNotNull(response);
Assert.IsTrue(response.Success);
Assert.IsFalse(response.ErrorReportCollection.Any());
Assert.AreEqual(5, response.Change.Count());
Assert.AreEqual(expected10Bills, response.Change[1000]);
Assert.AreEqual(expected5Bills, response.Change[500]);
Assert.AreEqual(expected50Coins, response.Change[50]);
Assert.AreEqual(expected25Coins, response.Change[25]);
Assert.AreEqual(expected1Coins, response.Change[1]);
}
public void WriteToLog_Test()
{
ChangeCalculator changeCalculator = new ChangeCalculator();
CalculateRequest request = new CalculateRequest();
request.ProductAmount = 100;
request.PaidAmount = 150;
CalculateResponse response = changeCalculator.Calculate(request);
}
public void Calculate_ChangeAmountZero_Test()
{
ChangeCalculator changeCalculator = new ChangeCalculator();
CalculateRequest request = new CalculateRequest();
request.ProductAmount = 1000;
request.PaidAmount = 1000;
CalculateResponse response = changeCalculator.Calculate(request);
Assert.IsNotNull(response);
Assert.IsTrue(response.Success);
Assert.IsFalse(response.ErrorReportCollection.Any());
}
public void PerformanceTest()
{
var input = new Dictionary<decimal, int>();
input.Add(0.1m, Int32.MaxValue);
input.Add(0.5m, Int32.MaxValue);
input.Add(1m, Int32.MaxValue);
input.Add(2m, Int32.MaxValue);
input.Add(3m, Int32.MaxValue);
input.Add(5m, Int32.MaxValue);
input.Add(7m, Int32.MaxValue);
input.Add(10m, Int32.MaxValue);
var calculator = new ChangeCalculator();
var result = calculator.Calculate(input, Int32.MaxValue);
}