mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-12 10:04:29 +02:00
87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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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 global // import "go.opentelemetry.io/otel/metric/internal/global"
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import (
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"sync"
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"testing"
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"github.com/stretchr/testify/assert"
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"go.opentelemetry.io/otel/metric"
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)
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func resetGlobalMeterProvider() {
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globalMeterProvider = defaultMeterProvider()
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delegateMeterOnce = sync.Once{}
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}
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type nonComparableMeterProvider struct {
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metric.MeterProvider
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nonComparable func() //nolint:structcheck,unused // This is not called.
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}
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func TestSetMeterProvider(t *testing.T) {
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t.Cleanup(resetGlobalMeterProvider)
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t.Run("Set With default is a noop", func(t *testing.T) {
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resetGlobalMeterProvider()
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SetMeterProvider(MeterProvider())
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mp, ok := MeterProvider().(*meterProvider)
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if !ok {
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t.Fatal("Global MeterProvider should be the default meter provider")
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}
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if mp.delegate != nil {
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t.Fatal("meter provider should not delegate when setting itself")
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}
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})
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t.Run("First Set() should replace the delegate", func(t *testing.T) {
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resetGlobalMeterProvider()
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SetMeterProvider(metric.NewNoopMeterProvider())
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_, ok := MeterProvider().(*meterProvider)
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if ok {
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t.Fatal("Global MeterProvider was not changed")
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}
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})
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t.Run("Set() should delegate existing Meter Providers", func(t *testing.T) {
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resetGlobalMeterProvider()
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mp := MeterProvider()
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SetMeterProvider(metric.NewNoopMeterProvider())
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dmp := mp.(*meterProvider)
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if dmp.delegate == nil {
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t.Fatal("The delegated meter providers should have a delegate")
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}
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})
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t.Run("non-comparable types should not panic", func(t *testing.T) {
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resetGlobalMeterProvider()
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mp := nonComparableMeterProvider{}
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SetMeterProvider(mp)
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assert.NotPanics(t, func() { SetMeterProvider(mp) })
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})
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}
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