84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// Copyright 2019 Prometheus Team
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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 config
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import (
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"errors"
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"testing"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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)
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type fakeRegisterer struct {
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registeredCollectors []prometheus.Collector
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}
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func (r *fakeRegisterer) Register(prometheus.Collector) error {
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return nil
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}
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func (r *fakeRegisterer) MustRegister(c ...prometheus.Collector) {
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r.registeredCollectors = append(r.registeredCollectors, c...)
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}
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func (r *fakeRegisterer) Unregister(prometheus.Collector) bool {
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return false
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}
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func TestCoordinatorRegistersMetrics(t *testing.T) {
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fr := fakeRegisterer{}
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NewCoordinator("testdata/conf.good.yml", &fr, log.NewNopLogger())
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if len(fr.registeredCollectors) == 0 {
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t.Error("expected NewCoordinator to register metrics on the given registerer")
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}
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}
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func TestCoordinatorNotifiesSubscribers(t *testing.T) {
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callBackCalled := false
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c := NewCoordinator("testdata/conf.good.yml", prometheus.NewRegistry(), log.NewNopLogger())
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c.Subscribe(func(*Config) error {
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callBackCalled = true
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return nil
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})
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err := c.Reload()
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if err != nil {
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t.Fatal(err)
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}
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if !callBackCalled {
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t.Fatal("expected coordinator.Reload() to call subscribers")
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}
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}
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func TestCoordinatorFailReloadWhenSubscriberFails(t *testing.T) {
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errMessage := "something happened"
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c := NewCoordinator("testdata/conf.good.yml", prometheus.NewRegistry(), log.NewNopLogger())
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c.Subscribe(func(*Config) error {
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return errors.New(errMessage)
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})
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err := c.Reload()
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if err == nil {
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t.Fatal("expected reload to throw an error")
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}
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if err.Error() != errMessage {
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t.Fatalf("expected error message %q but got %q", errMessage, err)
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}
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}
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