// Copyright 2019, 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 // // 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 global_test import ( "testing" "go.opentelemetry.io/otel/api/global" "go.opentelemetry.io/otel/api/metric" "go.opentelemetry.io/otel/api/trace" ) type ( testTraceProvider struct{} testMeterProvider struct{} ) var ( _ trace.Provider = &testTraceProvider{} _ metric.Provider = &testMeterProvider{} ) func (*testTraceProvider) Tracer(_ string) trace.Tracer { return &trace.NoopTracer{} } func (*testMeterProvider) Meter(_ string) metric.Meter { return &metric.NoopMeter{} } func TestMulitpleGlobalTracerProvider(t *testing.T) { p1 := testTraceProvider{} p2 := trace.NoopProvider{} global.SetTraceProvider(&p1) global.SetTraceProvider(&p2) got := global.TraceProvider() want := &p2 if got != want { t.Fatalf("Provider: got %p, want %p\n", got, want) } } func TestMulitpleGlobalMeterProvider(t *testing.T) { p1 := testMeterProvider{} p2 := metric.NoopProvider{} global.SetMeterProvider(&p1) global.SetMeterProvider(&p2) got := global.MeterProvider() want := &p2 if got != want { t.Fatalf("Provider: got %p, want %p\n", got, want) } }