112 lines
2.0 KiB
Go
112 lines
2.0 KiB
Go
package prometheus
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import (
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"runtime/debug"
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"testing"
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"time"
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dto "github.com/prometheus/client_model/go"
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)
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func TestGoCollector(t *testing.T) {
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var (
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c = NewGoCollector()
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ch = make(chan Metric)
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waitc = make(chan struct{})
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closec = make(chan struct{})
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old = -1
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)
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defer close(closec)
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go func() {
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c.Collect(ch)
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go func(c <-chan struct{}) {
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<-c
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}(closec)
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<-waitc
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c.Collect(ch)
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}()
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for {
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select {
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case metric := <-ch:
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switch m := metric.(type) {
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// Attention, this also catches Counter...
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case Gauge:
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pb := &dto.Metric{}
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m.Write(pb)
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if pb.GetGauge() == nil {
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continue
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}
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if old == -1 {
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old = int(pb.GetGauge().GetValue())
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close(waitc)
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continue
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}
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if diff := int(pb.GetGauge().GetValue()) - old; diff != 1 {
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// TODO: This is flaky in highly concurrent situations.
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t.Errorf("want 1 new goroutine, got %d", diff)
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}
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return
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}
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case <-time.After(1 * time.Second):
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t.Fatalf("expected collect timed out")
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}
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}
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}
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func TestGCCollector(t *testing.T) {
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var (
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c = NewGoCollector()
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ch = make(chan Metric)
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waitc = make(chan struct{})
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closec = make(chan struct{})
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oldGC uint64
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oldPause float64
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)
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defer close(closec)
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go func() {
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c.Collect(ch)
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// force GC
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debug.FreeOSMemory()
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<-waitc
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c.Collect(ch)
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}()
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first := true
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for {
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select {
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case metric := <-ch:
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switch m := metric.(type) {
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case *constSummary, *value:
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pb := &dto.Metric{}
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m.Write(pb)
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if pb.GetSummary() == nil {
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continue
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}
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if first {
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first = false
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oldGC = *pb.GetSummary().SampleCount
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oldPause = *pb.GetSummary().SampleSum
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close(waitc)
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continue
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}
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if diff := *pb.GetSummary().SampleCount - oldGC; diff != 1 {
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t.Errorf("want 1 new garbage collection run, got %d", diff)
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}
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if diff := *pb.GetSummary().SampleSum - oldPause; diff <= 0 {
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t.Errorf("want moar pause, got %f", diff)
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}
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return
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}
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case <-time.After(1 * time.Second):
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t.Fatalf("expected collect timed out")
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}
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}
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}
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