Function CollectAndCompare

prometheus/testutil/testutil.go:196–202

CollectAndCompare collects the metrics identified by `metricNames` and compares them in the Prometheus text exposition format to the data read from expected. NOTE: Be mindful of accidental discrepancies between expected and metricNames; metricNames filter both expected and collected metrics. See ht

(c prometheus.Collector, expected io.Reader, metricNames ...string)

// NOTE: Be mindful of accidental discrepancies between expected and metricNames; metricNames filter
// both expected and collected metrics. See https://github.com/prometheus/client_golang/issues/1351.
func CollectAndCompare(c prometheus.Collector, expected io.Reader, metricNames ...string) error {
	reg := prometheus.NewPedanticRegistry()
	if err := reg.Register(c); err != nil {
		return fmt.Errorf("registering collector failed: %w", err)
	}
	return GatherAndCompare(reg, expected, metricNames...)
}

// GatherAndCompare gathers all metrics from the provided Gatherer and compares
// it to an expected output read from the provided Reader in the Prometheus text