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