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Added comment explaining the new unit test

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This commit is contained in:
Mike Spreitzer 2021-01-18 00:57:09 -05:00
parent 194c22fed5
commit 42f8d4e28f
1 changed files with 10 additions and 0 deletions
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10
staging/src/k8s.io/apiserver/pkg/util/flowcontrol/metrics/sample_and_watermark_test.go
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@ -35,6 +35,15 @@ const (
numIterations = 100
)
/* TestSampler does a rough behavioral test of SampleAndWatermarkHistograms.
The test creates one and exercises it, checking that the count in the
sampling histogram is correct at each step. A fake clock is used, and
the exercise consists of changing that fake clock by an amount of time
chosen uniformly at random from a range that goes from a little negative
to somewhat more than two sampling periods. The negative changes are
included because negative changes have been observed in real monotonic
clock readings.
*/
func TestSampler(t *testing.T) {
t0 := time.Now()
clk := clock.NewFakePassiveClock(t0)
@ -74,6 +83,7 @@ func TestSampler(t *testing.T) {
}
}
/* getHistogramCount returns the count of the named histogram */
func getHistogramCount(regs Registerables, metricName string) (int64, error) {
considered := []string{}
mfs, err := legacyregistry.DefaultGatherer.Gather()