public void SamplerInvokesTransformerTransformMethod()
{
var collectedSamples = new List <Dictionary <GCSampleType, float> >();
var mockListener = Mock.Create <ISampledEventListener <Dictionary <GCSampleType, float> > >();
Mock.Arrange(() => mockListener.Sample())
.Returns(() => new Dictionary <GCSampleType, float>());
Func <ISampledEventListener <Dictionary <GCSampleType, float> > > mockListenerFactory = () =>
{
return(mockListener);
};
var mockTransfomer = Mock.Create <IGcSampleTransformer>();
Mock.Arrange(() => mockTransfomer.Transform(Arg.IsAny <Dictionary <GCSampleType, float> >()))
.DoInstead <Dictionary <GCSampleType, float> >((sampleValues) => { collectedSamples.Add(sampleValues); });
var sampler = new GCSamplerNetCore(_mockScheduler, mockListenerFactory, mockTransfomer, _fxSamplerValidForFrameworkOverride);
sampler.Start();
sampler.Sample();
Assert.AreEqual(1, collectedSamples.Count, $"Transform should have only been called once, it was called {collectedSamples.Count} time(s).");
}
public void SamplerTransformsValuesFromExpectedGCSampleTypes()
{
var collectedSamples = new List <Dictionary <GCSampleType, float> >();
var mockListener = Mock.Create <ISampledEventListener <Dictionary <GCSampleType, float> > >();
Mock.Arrange(() => mockListener.Sample())
.Returns(() => ExpectedSampleTypes.ToDictionary(x => x, x => 0f));
Func <ISampledEventListener <Dictionary <GCSampleType, float> > > mockListenerFactory = () =>
{
return(mockListener);
};
var mockTransfomer = Mock.Create <IGcSampleTransformer>();
Mock.Arrange(() => mockTransfomer.Transform(Arg.IsAny <Dictionary <GCSampleType, float> >()))
.DoInstead <Dictionary <GCSampleType, float> >((sampleValues) => { collectedSamples.Add(sampleValues); });
var sampler = new GCSamplerNetCore(_mockScheduler, mockListenerFactory, mockTransfomer, _fxSamplerValidForFrameworkOverride);
sampler.Start();
sampler.Sample();
Assert.AreEqual(1, collectedSamples.Count, "Only one sample should have been taken");
Assert.That(collectedSamples[0].Keys.ToArray(), Is.EquivalentTo(ExpectedSampleTypes), $"Mismatch between the GSampleTypes returned from Sample to the expectedList");
}
public void SamplerDisposesEventListenerOnException()
{
var samplerWasStopped = false;
var listenerWasDisposed = false;
var mockListener = Mock.Create <ISampledEventListener <Dictionary <GCSampleType, float> > >();
Mock.Arrange(() => mockListener.Dispose())
.DoInstead(() => { listenerWasDisposed = true; });
//This is our mechanism for shutting down the sampler. If a config change is used, it starts/stops 3x which makes
//it difficult to determine current state. Instead, throw an exception in the eventListener's sample method.
Mock.Arrange(() => mockListener.Sample())
.DoInstead(() => throw new Exception());
Func <ISampledEventListener <Dictionary <GCSampleType, float> > > mockListenerFactory = () =>
{
return(mockListener);
};
var mockScheduler = Mock.Create <IScheduler>();
//Prevents the scheduler from actually running
Mock.Arrange(() => _mockScheduler.ExecuteEvery(Arg.IsAny <Action>(), Arg.IsAny <TimeSpan>(), Arg.IsAny <TimeSpan?>()))
.DoNothing();
//Tracks the stop executing for the scheduler which indicates that the sampler
//has requested it to stop;
Mock.Arrange(() => mockScheduler.StopExecuting(Arg.IsAny <Action>(), Arg.IsAny <TimeSpan?>()))
.DoInstead <Action, TimeSpan?>((a, t) => { samplerWasStopped = true; });
var sampler = new GCSamplerNetCore(mockScheduler, mockListenerFactory, _mockTransformer, _fxSamplerValidForFrameworkOverride);
//Act
sampler.Start();
//Cause error which will shut down the sampler
sampler.Sample();
//Assert
Assert.IsTrue(samplerWasStopped);
Assert.IsTrue(listenerWasDisposed);
}
public void FailureToCollectSampleShutsDownSampler()
{
var samplerWasStopped = false;
var sampleAttempted = false;
var mockListener = Mock.Create <ISampledEventListener <Dictionary <GCSampleType, float> > >();
Mock.Arrange(() => mockListener.Sample())
.DoInstead(() =>
{
sampleAttempted = true;
throw new Exception();
});
Func <ISampledEventListener <Dictionary <GCSampleType, float> > > mockListenerFactory = () =>
{
return(mockListener);
};
var mockScheduler = Mock.Create <IScheduler>();
//Prevents the scheduler from actually running
Mock.Arrange(() => _mockScheduler.ExecuteEvery(Arg.IsAny <Action>(), Arg.IsAny <TimeSpan>(), Arg.IsAny <TimeSpan?>()))
.DoNothing();
//Tracks the stop executing for the scheduler which indicates that the sampler
//has requested it to stop;
Mock.Arrange(() => mockScheduler.StopExecuting(Arg.IsAny <Action>(), Arg.IsAny <TimeSpan?>()))
.DoInstead <Action, TimeSpan?>((a, t) => { samplerWasStopped = true; });
//Act
var sampler = new GCSamplerNetCore(mockScheduler, mockListenerFactory, _mockTransformer, _fxSamplerValidForFrameworkOverride);
sampler.Start();
sampler.Sample();
Assert.IsTrue(sampleAttempted);
Assert.IsTrue(samplerWasStopped);
}
