1 /* 2 * Copyright 2016-17, OpenCensus Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.opencensus.trace; 18 19 import static com.google.common.truth.Truth.assertThat; 20 21 import io.opencensus.trace.config.TraceConfig; 22 import io.opencensus.trace.export.ExportComponent; 23 import io.opencensus.trace.propagation.PropagationComponent; 24 import org.junit.Rule; 25 import org.junit.Test; 26 import org.junit.rules.ExpectedException; 27 import org.junit.runner.RunWith; 28 import org.junit.runners.JUnit4; 29 30 /** Unit tests for {@link Tracing}. */ 31 @RunWith(JUnit4.class) 32 public class TracingTest { 33 @Rule public ExpectedException thrown = ExpectedException.none(); 34 35 @Test loadTraceComponent_UsesProvidedClassLoader()36 public void loadTraceComponent_UsesProvidedClassLoader() { 37 final RuntimeException toThrow = new RuntimeException("UseClassLoader"); 38 thrown.expect(RuntimeException.class); 39 thrown.expectMessage("UseClassLoader"); 40 Tracing.loadTraceComponent( 41 new ClassLoader() { 42 @Override 43 public Class<?> loadClass(String name) { 44 throw toThrow; 45 } 46 }); 47 } 48 49 @Test loadTraceComponent_IgnoresMissingClasses()50 public void loadTraceComponent_IgnoresMissingClasses() { 51 ClassLoader classLoader = 52 new ClassLoader() { 53 @Override 54 public Class<?> loadClass(String name) throws ClassNotFoundException { 55 throw new ClassNotFoundException(); 56 } 57 }; 58 assertThat(Tracing.loadTraceComponent(classLoader).getClass().getName()) 59 .isEqualTo("io.opencensus.trace.TraceComponent$NoopTraceComponent"); 60 } 61 62 @Test defaultTracer()63 public void defaultTracer() { 64 assertThat(Tracing.getTracer()).isSameAs(Tracer.getNoopTracer()); 65 } 66 67 @Test defaultBinaryPropagationHandler()68 public void defaultBinaryPropagationHandler() { 69 assertThat(Tracing.getPropagationComponent()) 70 .isSameAs(PropagationComponent.getNoopPropagationComponent()); 71 } 72 73 @Test defaultTraceExporter()74 public void defaultTraceExporter() { 75 assertThat(Tracing.getExportComponent()) 76 .isInstanceOf(ExportComponent.newNoopExportComponent().getClass()); 77 } 78 79 @Test defaultTraceConfig()80 public void defaultTraceConfig() { 81 assertThat(Tracing.getTraceConfig()).isSameAs(TraceConfig.getNoopTraceConfig()); 82 } 83 } 84