package prometheus import ( "fmt" "net/http" "net/http/httptest" "testing" "github.com/influxdata/telegraf/testutil" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) const sampleTextFormat = `# HELP go_gc_duration_seconds A summary of the GC invocation durations. # TYPE go_gc_duration_seconds summary go_gc_duration_seconds{quantile="0"} 0.00010425500000000001 go_gc_duration_seconds{quantile="0.25"} 0.000139108 go_gc_duration_seconds{quantile="0.5"} 0.00015749400000000002 go_gc_duration_seconds{quantile="0.75"} 0.000331463 go_gc_duration_seconds{quantile="1"} 0.000667154 go_gc_duration_seconds_sum 0.0018183950000000002 go_gc_duration_seconds_count 7 # HELP go_goroutines Number of goroutines that currently exist. # TYPE go_goroutines gauge go_goroutines 15 ` func TestPrometheusGeneratesMetrics(t *testing.T) { ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, sampleTextFormat) })) defer ts.Close() p := &Prometheus{ Urls: []string{ts.URL}, } var acc testutil.Accumulator err := p.Gather(&acc) require.NoError(t, err) assert.True(t, acc.HasFloatField("go_gc_duration_seconds", "count")) assert.True(t, acc.HasFloatField("go_goroutines", "gauge")) }