1 /* 2 * Copyright (C) 2008 The Guava 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 com.google.common.testing; 18 19 import java.util.logging.Level; 20 import java.util.logging.LogRecord; 21 import java.util.logging.Logger; 22 import junit.framework.TestCase; 23 24 /** 25 * Unit test for {@link TestLogHandler}. 26 * 27 * @author kevinb 28 */ 29 public class TestLogHandlerTest extends TestCase { 30 31 private TestLogHandler handler; 32 private TearDownStack stack = new TearDownStack(); 33 34 @Override setUp()35 protected void setUp() throws Exception { 36 super.setUp(); 37 38 handler = new TestLogHandler(); 39 40 // You could also apply it higher up the Logger hierarchy than this 41 ExampleClassUnderTest.logger.addHandler(handler); 42 43 ExampleClassUnderTest.logger.setUseParentHandlers(false); // optional 44 45 stack.addTearDown( 46 new TearDown() { 47 @Override 48 public void tearDown() throws Exception { 49 ExampleClassUnderTest.logger.setUseParentHandlers(true); 50 ExampleClassUnderTest.logger.removeHandler(handler); 51 } 52 }); 53 } 54 test()55 public void test() throws Exception { 56 assertTrue(handler.getStoredLogRecords().isEmpty()); 57 ExampleClassUnderTest.foo(); 58 LogRecord record = handler.getStoredLogRecords().get(0); 59 assertEquals(Level.INFO, record.getLevel()); 60 assertEquals("message", record.getMessage()); 61 assertSame(EXCEPTION, record.getThrown()); 62 } 63 testConcurrentModification()64 public void testConcurrentModification() throws Exception { 65 // Tests for the absence of a bug where logging while iterating over the 66 // stored log records causes a ConcurrentModificationException 67 assertTrue(handler.getStoredLogRecords().isEmpty()); 68 ExampleClassUnderTest.foo(); 69 ExampleClassUnderTest.foo(); 70 for (LogRecord unused : handler.getStoredLogRecords()) { 71 ExampleClassUnderTest.foo(); 72 } 73 } 74 75 @Override runBare()76 public final void runBare() throws Throwable { 77 try { 78 setUp(); 79 runTest(); 80 } finally { 81 tearDown(); 82 } 83 } 84 85 @Override tearDown()86 protected void tearDown() { 87 stack.runTearDown(); 88 } 89 90 static final Exception EXCEPTION = new Exception(); 91 92 static class ExampleClassUnderTest { 93 static final Logger logger = Logger.getLogger(ExampleClassUnderTest.class.getName()); 94 foo()95 static void foo() { 96 logger.log(Level.INFO, "message", EXCEPTION); 97 } 98 } 99 } 100