[InlineData(0, "Cannot divide by zero.", "2", "/", "0", "+")] // Chained operation error
public void TestCalculatorInputResults(decimal expectedDecimalResult, string expectedErrorResult, params string[] inputs)
{
//Arrange
var calculator = new Calculator.CalculatorEngine.Implementations.Calculator(CalculatorStateFactoryMock.Object);
Validated <decimal> lastValidatedResult = null;
//Act
foreach (var input in inputs)
{
lastValidatedResult = resultOfSubmittedInput(input);
}
//Assert
lastValidatedResult.Should().Be(expectedValidatedResult());
//Local functions
Validated <decimal> resultOfSubmittedInput(string input)
=> input.Equals("+") ? calculator.SubmitOperationInputAndGetResult(additionOperation())
: input.Equals("/") ? calculator.SubmitOperationInputAndGetResult(divisionOperation())
: input.Equals("SquareRoot") ? calculator.SubmitOperationInputAndGetResult(squareRootOperation())
: input.Equals("PI") ? calculator.SubmitOperationInputAndGetResult(piOperation())
: input.Equals("i") ? calculator.SubmitOperationInputAndGetResult(iOperation())
: input.Equals("CompoundInterest") ? calculator.SubmitOperationInputAndGetResult(compoundInterestOperation())
: input.Equals("=") ? calculator.SubmitEqualsRequestAndGetResult()
: calculator.SubmitValueInputAndGetResult(decimal.Parse(input));
IOperation additionOperation()
=> Operation(2, new Func <IEnumerable <decimal>, Validated <decimal> >((operands)
=> new Validated <decimal>(operands.ToList()[0] + operands.ToList()[1])));
IOperation divisionOperation()
=> Operation(2, new Func <IEnumerable <decimal>, Validated <decimal> >((operands)
=> operands.ToList()[1] != 0
? new Validated <decimal>(operands.ToList()[0] / operands.ToList()[1])
: new StringError("Cannot divide by zero.")));
IOperation squareRootOperation()
=> Operation(1, new Func <IEnumerable <decimal>, Validated <decimal> >((operands)
=> operands.ToList()[0] >= 0
? new Validated <decimal>((decimal)Math.Sqrt((double)operands.ToList()[0]))
: new StringError("Cannot square root a negative.")));
IOperation piOperation()
=> Operation(0, new Func <IEnumerable <decimal>, Validated <decimal> >((operands)
=> new Validated <decimal>(3.14M)));
IOperation iOperation()
=> Operation(0, new Func <IEnumerable <decimal>, Validated <decimal> >((operands)
=> new StringError("Imaginary numbers are not valid.")));
IOperation compoundInterestOperation()
=> Operation(3, new Func <IEnumerable <decimal>, Validated <decimal> >((operands)
=> new Validated <decimal>(operands.ToList()[0] * (decimal)Math.Pow((double)(1 + operands.ToList()[1]), (double)operands.ToList()[2]))));
Validated <decimal> expectedValidatedResult()
=> expectedErrorResult == null
? new Validated <decimal>(expectedDecimalResult)
: new StringError(expectedErrorResult);
}