telegraf/plugins/inputs/prometheus/prometheus_test.go

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package prometheus
import (
"fmt"
"net/http"
"net/http/httptest"
"testing"
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"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) {
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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)
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assert.True(t, acc.HasFloatField("go_gc_duration_seconds", "count"))
assert.True(t, acc.HasFloatField("go_goroutines", "gauge"))
}