metric_test.go

Documentation: go.opentelemetry.io/otel

     1  // Copyright The OpenTelemetry Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package otel // import "go.opentelemetry.io/otel"
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/stretchr/testify/assert"
    21  
    22  	"go.opentelemetry.io/otel/metric"
    23  	"go.opentelemetry.io/otel/metric/embedded"
    24  	"go.opentelemetry.io/otel/metric/noop"
    25  )
    26  
    27  type testMeterProvider struct{ embedded.MeterProvider }
    28  
    29  var _ metric.MeterProvider = &testMeterProvider{}
    30  
    31  func (*testMeterProvider) Meter(_ string, _ ...metric.MeterOption) metric.Meter {
    32  	return noop.NewMeterProvider().Meter("")
    33  }
    34  
    35  func TestMultipleGlobalMeterProvider(t *testing.T) {
    36  	p1 := testMeterProvider{}
    37  	p2 := noop.NewMeterProvider()
    38  	SetMeterProvider(&p1)
    39  	SetMeterProvider(p2)
    40  
    41  	got := GetMeterProvider()
    42  	assert.Equal(t, p2, got)
    43  }
    44
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