statsd_exporter/exporter_test.go

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// Copyright 2013 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 main
import (
"testing"
"time"
)
// TestNegativeCounter validates when we send a negative
// number to a counter that we no longer panic the Exporter Listener.
func TestNegativeCounter(t *testing.T) {
defer func() {
if e := recover(); e != nil {
err := e.(error)
if err.Error() == "counter cannot decrease in value" {
t.Fatalf("Counter was negative and causes a panic.")
} else {
t.Fatalf("Unknown panic and error: %q", err.Error())
}
}
}()
events := make(chan Events, 1)
c := Events{
&CounterEvent{
metricName: "foo",
value: -1,
},
}
events <- c
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ex := NewExporter(&metricMapper{}, true)
// Close channel to signify we are done with the listener after a short period.
go func() {
time.Sleep(time.Millisecond * 100)
close(events)
}()
ex.Listen(events)
}