Function TestRegisterUnregisterCollector

prometheus/registry_test.go:879–890

TestRegisterUnregisterCollector ensures registering and unregistering a collector doesn't leave any dangling metrics. We use NewGoCollector as a nice concrete example of a collector with multiple metrics.

(t *testing.T)

// We use NewGoCollector as a nice concrete example of a collector with
// multiple metrics.
func TestRegisterUnregisterCollector(t *testing.T) {
	col := prometheus.NewGoCollector()

	reg := prometheus.NewRegistry()
	reg.MustRegister(col)
	reg.Unregister(col)
	if metrics, err := reg.Gather(); err != nil {
		t.Error("error gathering sample metric")
	} else if len(metrics) != 0 {
		t.Error("should have unregistered metric")
	}
}

// TestHistogramVecRegisterGatherConcurrency is an end-to-end test that
// concurrently calls Observe on random elements of a HistogramVec while the