func TestPrometheusCounter(t *testing.T) {
c := prometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "test",
Subsystem: "prometheus_counter",
Name: "foobar",
Help: "Lorem ipsum.",
}, []string{})
c.Add(1)
c.Add(2)
if want, have := strings.Join([]string{
`# HELP test_prometheus_counter_foobar Lorem ipsum.`,
`# TYPE test_prometheus_counter_foobar counter`,
`test_prometheus_counter_foobar 3`,
}, "\n"), teststat.ScrapePrometheus(t); !strings.Contains(have, want) {
t.Errorf("metric stanza not found or incorrect\n%s", have)
}
c.Add(3)
c.Add(4)
if want, have := strings.Join([]string{
`# HELP test_prometheus_counter_foobar Lorem ipsum.`,
`# TYPE test_prometheus_counter_foobar counter`,
`test_prometheus_counter_foobar 10`,
}, "\n"), teststat.ScrapePrometheus(t); !strings.Contains(have, want) {
t.Errorf("metric stanza not found or incorrect\n%s", have)
}
}
func TestPrometheusGauge(t *testing.T) {
c := prometheus.NewGauge(stdprometheus.GaugeOpts{
Namespace: "test",
Subsystem: "prometheus_gauge",
Name: "foobar",
Help: "Dolor sit.",
}, []string{})
c.Set(42)
if want, have := strings.Join([]string{
`# HELP test_prometheus_gauge_foobar Dolor sit.`,
`# TYPE test_prometheus_gauge_foobar gauge`,
`test_prometheus_gauge_foobar 42`,
}, "\n"), teststat.ScrapePrometheus(t); !strings.Contains(have, want) {
t.Errorf("metric stanza not found or incorrect\n%s", have)
}
c.Add(-43)
if want, have := strings.Join([]string{
`# HELP test_prometheus_gauge_foobar Dolor sit.`,
`# TYPE test_prometheus_gauge_foobar gauge`,
`test_prometheus_gauge_foobar -1`,
}, "\n"), teststat.ScrapePrometheus(t); !strings.Contains(have, want) {
t.Errorf("metric stanza not found or incorrect\n%s", have)
}
}
func TestPrometheusCallbackGauge(t *testing.T) {
value := 123.456
cb := func() float64 { return value }
prometheus.RegisterCallbackGauge(stdprometheus.GaugeOpts{
Namespace: "test",
Subsystem: "prometheus_gauge",
Name: "bazbaz",
Help: "Help string.",
}, cb)
if want, have := strings.Join([]string{
`# HELP test_prometheus_gauge_bazbaz Help string.`,
`# TYPE test_prometheus_gauge_bazbaz gauge`,
`test_prometheus_gauge_bazbaz 123.456`,
}, "\n"), teststat.ScrapePrometheus(t); !strings.Contains(have, want) {
t.Errorf("metric stanza not found or incorrect\n%s", have)
}
}
func TestPrometheusLabelBehavior(t *testing.T) {
c := prometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "test",
Subsystem: "prometheus_label_behavior",
Name: "foobar",
Help: "Abc def.",
}, []string{"used_key", "unused_key"})
c.With(metrics.Field{Key: "used_key", Value: "declared"}).Add(1)
c.Add(1)
if want, have := strings.Join([]string{
`# HELP test_prometheus_label_behavior_foobar Abc def.`,
`# TYPE test_prometheus_label_behavior_foobar counter`,
`test_prometheus_label_behavior_foobar{unused_key="unknown",used_key="declared"} 1`,
`test_prometheus_label_behavior_foobar{unused_key="unknown",used_key="unknown"} 1`,
}, "\n"), teststat.ScrapePrometheus(t); !strings.Contains(have, want) {
t.Errorf("metric stanza not found or incorrect\n%s", have)
}
}