59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Copyright 2014 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package prometheus
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import (
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"math"
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"testing"
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dto "github.com/prometheus/client_model/go"
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)
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func TestCounterAdd(t *testing.T) {
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counter := NewCounter(CounterOpts{
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Name: "test",
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Help: "test help",
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ConstLabels: Labels{"a": "1", "b": "2"},
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}).(*counter)
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counter.Inc()
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if expected, got := 1., math.Float64frombits(counter.valBits); expected != got {
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t.Errorf("Expected %f, got %f.", expected, got)
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}
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counter.Add(42)
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if expected, got := 43., math.Float64frombits(counter.valBits); expected != got {
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t.Errorf("Expected %f, got %f.", expected, got)
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}
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if expected, got := "counter cannot decrease in value", decreaseCounter(counter).Error(); expected != got {
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t.Errorf("Expected error %q, got %q.", expected, got)
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}
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m := &dto.Metric{}
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counter.Write(m)
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if expected, got := `label:<name:"a" value:"1" > label:<name:"b" value:"2" > counter:<value:43 > `, m.String(); expected != got {
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t.Errorf("expected %q, got %q", expected, got)
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}
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}
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func decreaseCounter(c *counter) (err error) {
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defer func() {
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if e := recover(); e != nil {
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err = e.(error)
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}
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}()
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c.Add(-1)
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return nil
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}
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