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collector_test.go
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package prometheus
import (
"os"
"testing"
"time"
"github.com/ethereum/go-ethereum/metrics"
)
func TestMain(m *testing.M) {
metrics.Enabled = true
os.Exit(m.Run())
}
func TestCollector(t *testing.T) {
c := newCollector()
counter := metrics.NewCounter()
counter.Inc(12345)
c.addCounter("test/counter", counter)
gauge := metrics.NewGauge()
gauge.Update(23456)
c.addGauge("test/gauge", gauge)
gaugeFloat64 := metrics.NewGaugeFloat64()
gaugeFloat64.Update(34567.89)
c.addGaugeFloat64("test/gauge_float64", gaugeFloat64)
histogram := metrics.NewHistogram(&metrics.NilSample{})
c.addHistogram("test/histogram", histogram)
meter := metrics.NewMeter()
defer meter.Stop()
meter.Mark(9999999)
c.addMeter("test/meter", meter)
timer := metrics.NewTimer()
defer timer.Stop()
timer.Update(20 * time.Millisecond)
timer.Update(21 * time.Millisecond)
timer.Update(22 * time.Millisecond)
timer.Update(120 * time.Millisecond)
timer.Update(23 * time.Millisecond)
timer.Update(24 * time.Millisecond)
c.addTimer("test/timer", timer)
resettingTimer := metrics.NewResettingTimer()
resettingTimer.Update(10 * time.Millisecond)
resettingTimer.Update(11 * time.Millisecond)
resettingTimer.Update(12 * time.Millisecond)
resettingTimer.Update(120 * time.Millisecond)
resettingTimer.Update(13 * time.Millisecond)
resettingTimer.Update(14 * time.Millisecond)
c.addResettingTimer("test/resetting_timer", resettingTimer.Snapshot())
emptyResettingTimer := metrics.NewResettingTimer().Snapshot()
c.addResettingTimer("test/empty_resetting_timer", emptyResettingTimer)
const expectedOutput = `# TYPE test_counter gauge
test_counter 12345
# TYPE test_gauge gauge
test_gauge 23456
# TYPE test_gauge_float64 gauge
test_gauge_float64 34567.89
# TYPE test_histogram_count counter
test_histogram_count 0
# TYPE test_histogram summary
test_histogram {quantile="0.5"} 0
test_histogram {quantile="0.75"} 0
test_histogram {quantile="0.95"} 0
test_histogram {quantile="0.99"} 0
test_histogram {quantile="0.999"} 0
test_histogram {quantile="0.9999"} 0
# TYPE test_meter gauge
test_meter 9999999
# TYPE test_timer_count counter
test_timer_count 6
# TYPE test_timer summary
test_timer {quantile="0.5"} 2.25e+07
test_timer {quantile="0.75"} 4.8e+07
test_timer {quantile="0.95"} 1.2e+08
test_timer {quantile="0.99"} 1.2e+08
test_timer {quantile="0.999"} 1.2e+08
test_timer {quantile="0.9999"} 1.2e+08
# TYPE test_resetting_timer_count counter
test_resetting_timer_count 6
# TYPE test_resetting_timer summary
test_resetting_timer {quantile="0.50"} 12000000
test_resetting_timer {quantile="0.95"} 120000000
test_resetting_timer {quantile="0.99"} 120000000
`
exp := c.buff.String()
if exp != expectedOutput {
t.Log("Expected Output:\n", expectedOutput)
t.Log("Actual Output:\n", exp)
t.Fatal("unexpected collector output")
}
}