public void Emitting_Should_invoke_logger_for_error_When_exception_is_thrown()
{
var thrown = new Exception("I FAILED!");
UnitUnderTest.Subscribe(msg => throw thrown);
UnitUnderTest.Emit(Mock.Of <Data>());
FakeLogger.Verify(f => f.Error(It.Is <string>(m => m.Contains("Error in observer while emitting value.")), thrown), Times.Once);
}
public void TestAlerting()
{
var fakeLogger = new FakeLogger();
var reportGenerator = new TenSecondTwoMinuteReportGenerator(fakeLogger);
var now = DateTime.UtcNow;
// Add 1 event at T-3 minutes and N-2 events in the past 5 seconds.
reportGenerator.twoMinQueue.Enqueue(now.Subtract(TimeSpan.FromMinutes(3)));
for (int i = 0; i < TenSecondTwoMinuteReportGenerator.ALERT_NUMBER - 2; i++)
{
reportGenerator.twoMinQueue.Enqueue(now.Subtract(TimeSpan.FromSeconds(5)));
}
// Generate the report for [T-5,T] minutes, should not trigger an alert as there are
// N-1 elements in the queue.
reportGenerator.GenerateAlertReport(
now.Subtract(TimeSpan.FromMinutes(5)),
now
);
Assert.IsTrue(!fakeLogger.Logs.Any(x => x.Contains("alert")));
// Then add the N-th event
reportGenerator.twoMinQueue.Enqueue(now.Subtract(TimeSpan.FromSeconds(5)));
// Generate the report, should trigger an alert.
reportGenerator.GenerateAlertReport(
now.Subtract(TimeSpan.FromMinutes(5)),
now
);
Assert.IsTrue(fakeLogger.Logs.Any(x => x.Contains("alert")));
// Clear the queue and run the report again for [T-2,T] minutes,
// should display "...recovered" as the T-3 minutes element was removed.
fakeLogger.Logs.Clear();
// Generate the report, should not trigger an alert.
reportGenerator.GenerateAlertReport(
now.Subtract(TimeSpan.FromMinutes(2)),
now
);
Assert.IsTrue(fakeLogger.Logs.Any(x => x.Contains("recovered")));
}
public FakeLoggerFactory()
{
Logger = new FakeLogger();
}