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Histogram buckets should include counts for all values under the bucket ceiling, not just those between the ceiling and the next lower ceiling. See https://prometheus.io/docs/tutorials/understanding_metric_types/\#histogram Updates tailscale/corp#24522 Signed-off-by: Percy Wegmann <percy@tailscale.com>
30 lines
632 B
Go
30 lines
632 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package prober
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import (
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"testing"
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"github.com/google/go-cmp/cmp"
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)
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func TestHistogram(t *testing.T) {
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h := newHistogram([]float64{1, 2})
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h.add(0.5)
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h.add(1)
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h.add(1.5)
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h.add(2)
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h.add(2.5)
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if diff := cmp.Diff(h.count, uint64(5)); diff != "" {
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t.Errorf("wrong count; (-got+want):%v", diff)
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}
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if diff := cmp.Diff(h.sum, 7.5); diff != "" {
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t.Errorf("wrong sum; (-got+want):%v", diff)
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}
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if diff := cmp.Diff(h.bucketedCounts, map[float64]uint64{1: 2, 2: 4}); diff != "" {
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t.Errorf("wrong bucketedCounts; (-got+want):%v", diff)
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}
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}
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