void detects_anomalies_with_one_threshold_set()
{
act = () => anomalies = detector.DetectAnomalies(testData);
context["when only upper threshold is set"] = () =>
{
before = () =>
{
detector = new ThresholdDetector <double, int>(null, 5.0);
};
it["detects anomalies above the upper threshold"] = () =>
{
anomalies.Should().Match(a => a.All(p => p.DataPoint.Value > 5.0));
};
};
context["when only lower threshold is set"] = () =>
{
before = () =>
{
detector = new ThresholdDetector <double, int>(0.0, null);
};
it["detects anomalies below the lower threshold"] = () =>
{
anomalies.Should().Match(a => a.All(p => p.DataPoint.Value < 0.0));
};
};
}
void detects_no_anomalies()
{
act = () => anomalies = detector.DetectAnomalies(testData);
context["when all points are within the thresholds"] = () =>
{
before = () =>
{
detector = new ThresholdDetector <double, int>(-20, 20);
};
it["detects no anomalies"] = () =>
{
anomalies.Should().BeEmpty();
};
};
}
void detects_anomalies_in_data()
{
act = () => anomalies = detector.DetectAnomalies(testData);
context["when upper threshold is given"] = () =>
{
before = () =>
{
detector = new ThresholdDetector <double, int>(upperThreshold: 5.0);
};
it["detects anomalies above the upper threshold"] = () =>
{
anomalies.Should().HaveCount(1);
anomalies[0].DataPoint.Value.ShouldBeEquivalentTo(10.0);
};
};
context["when lower threshold is given"] = () =>
{
before = () =>
{
detector = new ThresholdDetector <double, int>(lowerThreshold: 0.0);
};
it["detects anomalies below the lower threshold"] = () =>
{
anomalies.Should().HaveCount(1);
anomalies[0].DataPoint.Value.ShouldBeEquivalentTo(-3.0);
};
};
context["when both thresholds are given"] = () =>
{
before = () =>
{
detector = new ThresholdDetector <double, int>(0.0, 5.0);
};
it["detects anomalies outside the thresholds"] = () =>
{
anomalies.Should().HaveCount(2);
};
};
}
