Function testMetricVec

prometheus/vec_test.go:287–342

(t *testing.T, vec *GaugeVec)

}

func testMetricVec(t *testing.T, vec *GaugeVec) {
	vec.Reset() // Actually test Reset now!

	var pair [2]string
	// Keep track of metrics.
	expected := map[[2]string]int{}

	for i := 0; i < 1000; i++ {
		pair[0], pair[1] = strconv.Itoa(i%4), strconv.Itoa(i%5) // Varying combinations multiples.
		expected[pair]++
		vec.WithLabelValues(pair[0], pair[1]).Inc()

		expected[[2]string{"v1", "v2"}]++
		vec.WithLabelValues("v1", "v2").Inc()
	}

	var total int
	for _, metrics := range vec.metrics {
		for _, metric := range metrics {
			total++
			copy(pair[:], metric.values)

			var metricOut dto.Metric
			if err := metric.metric.Write(&metricOut); err != nil {
				t.Fatal(err)
			}
			actual := *metricOut.Gauge.Value

			var actualPair [2]string
			for i, label := range metricOut.Label {
				actualPair[i] = *label.Value
			}

			// Test output pair against metric.values to ensure we've selected
			// the right one. We check this to ensure the below check means
			// anything at all.
			if actualPair != pair {
				t.Fatalf("unexpected pair association in metric map: %v != %v", actualPair, pair)
			}

			if actual != float64(expected[pair]) {
				t.Fatalf("incorrect counter value for %v: %v != %v", pair, actual, expected[pair])
			}
		}
	}

	if total != len(expected) {
		t.Fatalf("unexpected number of metrics: %v != %v", total, len(expected))
	}

	vec.Reset()

	if len(vec.metrics) > 0 {
		t.Fatalf("reset failed")
	}
}

func TestMetricVecWithConstraints(t *testing.T) {