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.stats; 18 19 import static com.google.common.truth.Truth.assertThat; 20 21 import org.junit.Rule; 22 import org.junit.Test; 23 import org.junit.rules.ExpectedException; 24 import org.junit.runner.RunWith; 25 import org.junit.runners.JUnit4; 26 27 /** Tests for {@link Stats}. */ 28 @RunWith(JUnit4.class) 29 public final class StatsTest { 30 @Rule public ExpectedException thrown = ExpectedException.none(); 31 32 @Test 33 public void loadStatsManager_UsesProvidedClassLoader() { 34 final RuntimeException toThrow = new RuntimeException("UseClassLoader"); 35 thrown.expect(RuntimeException.class); 36 thrown.expectMessage("UseClassLoader"); 37 Stats.loadStatsComponent( 38 new ClassLoader() { 39 @Override 40 public Class<?> loadClass(String name) { 41 throw toThrow; 42 } 43 }); 44 } 45 46 @Test 47 public void loadStatsManager_IgnoresMissingClasses() { 48 ClassLoader classLoader = 49 new ClassLoader() { 50 @Override 51 public Class<?> loadClass(String name) throws ClassNotFoundException { 52 throw new ClassNotFoundException(); 53 } 54 }; 55 56 assertThat(Stats.loadStatsComponent(classLoader).getClass().getName()) 57 .isEqualTo("io.opencensus.stats.NoopStats$NoopStatsComponent"); 58 } 59 60 @Test 61 public void defaultValues() { 62 assertThat(Stats.getStatsRecorder()).isEqualTo(NoopStats.getNoopStatsRecorder()); 63 assertThat(Stats.getViewManager()).isInstanceOf(NoopStats.newNoopViewManager().getClass()); 64 } 65 66 @Test 67 public void getState() { 68 assertThat(Stats.getState()).isEqualTo(StatsCollectionState.DISABLED); 69 } 70 71 @Test 72 @SuppressWarnings("deprecation") 73 public void setState_IgnoresInput() { 74 Stats.setState(StatsCollectionState.ENABLED); 75 assertThat(Stats.getState()).isEqualTo(StatsCollectionState.DISABLED); 76 } 77 78 @Test 79 @SuppressWarnings("deprecation") 80 public void setState_DisallowsNull() { 81 thrown.expect(NullPointerException.class); 82 thrown.expectMessage("state"); 83 Stats.setState(null); 84 } 85 } 86
