public async Task CanAddNewCalculator()
{
var api = new Mock<ICalculatorApi>();
var calculator = new Calculator(api.Object);
var sut = new CalculatorPool(() => calculator, Mock.Of<ILog>());
await sut.Receive(CalculationRequest.Initial);
api.Verify(x => x.Send(It.IsAny<CalculationRequest>()));
}
public async Task LogsNextReceivedRequest()
{
var api = new Mock<ICalculatorApi>();
var calculator = new Calculator(api.Object);
var log = new Mock<ILog>();
var sut = new CalculatorPool(() => calculator, log.Object);
var request = CalculationRequest.Initial;
await sut.Receive(request);
log.Verify(x => x.Info($"Calculating next value for {request.Value}"));
}
public async Task CanAddNewCalculatorParallely()
{
var api = new Mock<ICalculatorApi>();
api.Setup(x => x.Send(It.IsAny<CalculationRequest>())).Returns(Task.CompletedTask);
var sut = new CalculatorPool(() => new Calculator(api.Object), Mock.Of<ILog>());
const int InstanceCount = 42;
var tasks = Enumerable.Range(0, InstanceCount).Select(_ => sut.Receive(CalculationRequest.Initial)).ToArray();
await Task.WhenAll(tasks);
api.Verify(x => x.Send(It.IsAny<CalculationRequest>()), Times.Exactly(InstanceCount));
}
public async Task UsesExistingCalculatorOnNextMessage()
{
var api = new Mock<ICalculatorApi>();
api.Setup(x => x.Send(It.IsAny<CalculationRequest>())).Returns(Task.CompletedTask);
var sut = new CalculatorPool(() => new Calculator(api.Object), Mock.Of<ILog>());
var calculationRequest = CalculationRequest.Initial;
await sut.Receive(calculationRequest);
var nextRequest = calculationRequest.WithValue(42);
await sut.Receive(nextRequest);
api.Verify(x => x.Send(It.Is<CalculationRequest>(r => r.CorrelationId == calculationRequest.CorrelationId &&
r.Value == calculationRequest.Value + nextRequest.Value)));
}