public void WithEventEmitter_WhenExceptionRaised_ExceptionIsCaughtAndLogged()
{
const string exceptionMessage = "Listener1 exception";
bool handled1 = false;
bool handled2 = false;
// test logger, logs to memory and set the MessageSeen property if
// the message passed to the constructor is logged;
var logger = new TestLogger(messageToTest: exceptionMessage);
var em = new TestEventEmitter(logger);
List <int> callOrder = new List <int>();
void Listener1(TestEventEmitterArgs args)
{
handled1 = true;
callOrder.Add(1);
throw new Exception(exceptionMessage);
}
void Listener2(TestEventEmitterArgs args)
{
handled2 = true;
callOrder.Add(2);
}
em.On(1, Listener1);
em.On(1, Listener2);
em.DoDummyEmit(1, string.Empty);
handled1.Should().BeTrue();
handled2.Should().BeTrue();
logger.MessageSeen.Should().BeTrue();
callOrder.Count.Should().Be(2);
callOrder[0].Should().Be(1);
callOrder[1].Should().Be(2);
handled1 = handled2 = false;
logger.Reset();
callOrder = new List <int>();
em.Once(1, Listener1);
em.Once(1, Listener2);
em.DoDummyEmit(1, string.Empty);
handled1.Should().BeTrue();
handled2.Should().BeTrue();
callOrder.Count.Should().Be(4);
// On is handled
callOrder[0].Should().Be(1);
callOrder[1].Should().Be(2);
// then Once
callOrder[2].Should().Be(1);
callOrder[3].Should().Be(2);
logger.MessageSeen.Should().BeTrue();
}
public void WithEventEmitter_WhenOnce_ListenerRegistersForOneEvent()
{
var em = new TestEventEmitter(DefaultLogger.LoggerInstance);
bool t = false;
bool tt = false;
string message = string.Empty;
int counter = 0;
void Reset()
{
t = false;
tt = false;
}
void Handler1(TestEventEmitterArgs args)
{
counter++;
message = args.Message;
t = true;
}
void Handler2(TestEventEmitterArgs args)
{
counter++;
message = args.Message;
tt = true;
}
// no event/state argument, catch all
em.Once(Handler1);
em.Once(Handler1);
em.DoDummyEmit(1, "once");
t.Should().BeTrue();
message.Should().Be("once");
counter.Should().Be(2);
Reset();
// only catch 1 events
em.Once(1, Handler2);
em.DoDummyEmit(2, "on");
// no events should be handled, t & tt should be false here
t.Should().BeFalse();
tt.Should().BeFalse();
// there are 2 listeners and the first is catch all
// but the first should have already handled an event and de-registered
// so the count remains the same
counter.Should().Be(2);
Reset();
em.DoDummyEmit(1, "on");
// t should not have been set, tt should complete for the first time
t.Should().BeFalse();
tt.Should().BeTrue();
// still 2 listeners and we sent a 1 event which second should handle
counter.Should().Be(3);
Reset();
em.DoDummyEmit(1, "on");
// t & tt should both be false
t.Should().BeFalse();
tt.Should().BeFalse();
// handlers should be de-registered so the count should remain at 2
counter.Should().Be(3);
}