client_golang/prometheus/testutil/testutil_test.go

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// Copyright 2018 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 testutil
import (
"strings"
"testing"
"github.com/prometheus/client_golang/prometheus"
)
func TestCollectAndCompare(t *testing.T) {
const metadata = `
# HELP some_total A value that represents a counter.
# TYPE some_total counter
`
c := prometheus.NewCounter(prometheus.CounterOpts{
Name: "some_total",
Help: "A value that represents a counter.",
ConstLabels: prometheus.Labels{
"label1": "value1",
},
})
c.Inc()
expected := `
some_total{ label1 = "value1" } 1
`
if err := CollectAndCompare(c, strings.NewReader(metadata+expected), "some_total"); err != nil {
t.Errorf("unexpected collecting result:\n%s", err)
}
}
func TestNoMetricFilter(t *testing.T) {
const metadata = `
# HELP some_total A value that represents a counter.
# TYPE some_total counter
`
c := prometheus.NewCounter(prometheus.CounterOpts{
Name: "some_total",
Help: "A value that represents a counter.",
ConstLabels: prometheus.Labels{
"label1": "value1",
},
})
c.Inc()
expected := `
some_total{label1="value1"} 1
`
if err := CollectAndCompare(c, strings.NewReader(metadata+expected)); err != nil {
t.Errorf("unexpected collecting result:\n%s", err)
}
}
func TestMetricNotFound(t *testing.T) {
const metadata = `
# HELP some_other_metric A value that represents a counter.
# TYPE some_other_metric counter
`
c := prometheus.NewCounter(prometheus.CounterOpts{
Name: "some_total",
Help: "A value that represents a counter.",
ConstLabels: prometheus.Labels{
"label1": "value1",
},
})
c.Inc()
expected := `
some_other_metric{label1="value1"} 1
`
expectedError := `
metric output does not match expectation; want:
# HELP some_other_metric A value that represents a counter.
# TYPE some_other_metric counter
some_other_metric{label1="value1"} 1
got:
# HELP some_total A value that represents a counter.
# TYPE some_total counter
some_total{label1="value1"} 1
`
err := CollectAndCompare(c, strings.NewReader(metadata+expected))
if err == nil {
t.Error("Expected error, got no error.")
}
if err.Error() != expectedError {
t.Errorf("Expected\n%#+v\nGot:\n%#+v\n", expectedError, err.Error())
}
}