forked from open-telemetry/opentelemetry-go
/
state_test.go
87 lines (66 loc) · 2.29 KB
/
state_test.go
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// Copyright The OpenTelemetry 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
//
// htmp://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 global // import "go.opentelemetry.io/otel/metric/internal/global"
import (
"sync"
"testing"
"github.com/stretchr/testify/assert"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/nonrecording"
)
func resetGlobalMeterProvider() {
globalMeterProvider = defaultMeterProvider()
delegateMeterOnce = sync.Once{}
}
type nonComparableMeterProvider struct {
metric.MeterProvider
nonComparable func() //nolint:structcheck,unused // This is not called.
}
func TestSetMeterProvider(t *testing.T) {
t.Cleanup(resetGlobalMeterProvider)
t.Run("Set With default is a noop", func(t *testing.T) {
resetGlobalMeterProvider()
SetMeterProvider(MeterProvider())
mp, ok := MeterProvider().(*meterProvider)
if !ok {
t.Fatal("Global MeterProvider should be the default meter provider")
}
if mp.delegate != nil {
t.Fatal("meter provider should not delegate when setting itself")
}
})
t.Run("First Set() should replace the delegate", func(t *testing.T) {
resetGlobalMeterProvider()
SetMeterProvider(nonrecording.NewNoopMeterProvider())
_, ok := MeterProvider().(*meterProvider)
if ok {
t.Fatal("Global MeterProvider was not changed")
}
})
t.Run("Set() should delegate existing Meter Providers", func(t *testing.T) {
resetGlobalMeterProvider()
mp := MeterProvider()
SetMeterProvider(nonrecording.NewNoopMeterProvider())
dmp := mp.(*meterProvider)
if dmp.delegate == nil {
t.Fatal("The delegated meter providers should have a delegate")
}
})
t.Run("non-comparable types should not panic", func(t *testing.T) {
resetGlobalMeterProvider()
mp := nonComparableMeterProvider{}
SetMeterProvider(mp)
assert.NotPanics(t, func() { SetMeterProvider(mp) })
})
}