public void AddingSingleNumber_ReturnsThatNumber()
{
var parser = new FakeParser();
var storage = new FakeStorage();
var calculator = new Calculator(parser, storage);
var result = calculator.Add("1");
Assert.Equal(1, result);
}
public void AddingEmptySet_ReturnsZero()
{
var parser = new FakeParser();
var storage = new FakeStorage();
var calculator = new Calculator(parser, storage);
var result = calculator.Add("");
Assert.Equal(0, result);
}
public void UsingTheCalculator_LogsToDatabase()
{
var parser = new FakeParser();
var storage = Substitute.For <IHistoryStorage>();
var calculator = new Calculator(parser, storage);
calculator.Add("1,2,3");
storage.Received().LogUsage("1,2,3", 6);
}