prometheus/pkg/labels/labels_test.go

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// Copyright 2019 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 labels
import (
"testing"
)
func TestLabels_MatchLabels(t *testing.T) {
labels := Labels{
{
Name: "__name__",
Value: "ALERTS",
},
{
Name: "alertname",
Value: "HTTPRequestRateLow",
},
{
Name: "alertstate",
Value: "pending",
},
{
Name: "instance",
Value: "0",
},
{
Name: "job",
Value: "app-server",
},
{
Name: "severity",
Value: "critical",
},
}
providedNames := []string{
"__name__",
"alertname",
"alertstate",
"instance",
}
got := labels.MatchLabels(true, providedNames...)
expected := Labels{
{
Name: "__name__",
Value: "ALERTS",
},
{
Name: "alertname",
Value: "HTTPRequestRateLow",
},
{
Name: "alertstate",
Value: "pending",
},
{
Name: "instance",
Value: "0",
},
}
assertSlice(t, got, expected)
// Now try with 'on' set to false.
got = labels.MatchLabels(false, providedNames...)
expected = Labels{
{
Name: "job",
Value: "app-server",
},
{
Name: "severity",
Value: "critical",
},
}
assertSlice(t, got, expected)
}
func assertSlice(t *testing.T, got, expected Labels) {
if len(expected) != len(got) {
t.Errorf("expected the length of matched label names to be %d, but got %d", len(expected), len(got))
}
for i, expectedLabel := range expected {
if expectedLabel.Name != got[i].Name {
t.Errorf("expected to get Label with name %s, but got %s instead", expectedLabel.Name, got[i].Name)
}
}
}