1 /* 2 * Copyright (C) 2012 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.io; 18 19 import static org.mockito.Mockito.doThrow; 20 import static org.mockito.Mockito.mock; 21 import static org.mockito.Mockito.verify; 22 23 import java.io.Flushable; 24 import java.io.IOException; 25 import junit.framework.TestCase; 26 27 /** 28 * Unit tests for {@link Flushables}. 29 * 30 * <p>Checks proper flushing behavior, and ensures that IOExceptions on Flushable.flush() are not 31 * propagated out from the {@link Flushables#flush} method if {@code swallowException} is true. 32 * 33 * @author Michael Lancaster 34 */ 35 public class FlushablesTest extends TestCase { 36 private Flushable mockFlushable; 37 testFlush_clean()38 public void testFlush_clean() throws IOException { 39 // make sure that no exception is thrown regardless of value of 40 // 'swallowException' when the mock does not throw an exception. 41 setupFlushable(false); 42 doFlush(mockFlushable, false, false); 43 44 setupFlushable(false); 45 doFlush(mockFlushable, true, false); 46 } 47 testFlush_flushableWithEatenException()48 public void testFlush_flushableWithEatenException() throws IOException { 49 // make sure that no exception is thrown if 'swallowException' is true 50 // when the mock does throw an exception on flush. 51 setupFlushable(true); 52 doFlush(mockFlushable, true, false); 53 } 54 testFlush_flushableWithThrownException()55 public void testFlush_flushableWithThrownException() throws IOException { 56 // make sure that the exception is thrown if 'swallowException' is false 57 // when the mock does throw an exception on flush. 58 setupFlushable(true); 59 doFlush(mockFlushable, false, true); 60 } 61 testFlushQuietly_flushableWithEatenException()62 public void testFlushQuietly_flushableWithEatenException() throws IOException { 63 // make sure that no exception is thrown by flushQuietly when the mock does 64 // throw an exception on flush. 65 setupFlushable(true); 66 Flushables.flushQuietly(mockFlushable); 67 } 68 69 // Set up a flushable to expect to be flushed, and optionally to 70 // throw an exception. setupFlushable(boolean shouldThrowOnFlush)71 private void setupFlushable(boolean shouldThrowOnFlush) throws IOException { 72 mockFlushable = mock(Flushable.class); 73 if (shouldThrowOnFlush) { 74 doThrow( 75 new IOException( 76 "This should only appear in the " + "logs. It should not be rethrown.")) 77 .when(mockFlushable) 78 .flush(); 79 } 80 } 81 82 // Flush the flushable using the Flushables, passing in the swallowException 83 // parameter. expectThrown determines whether we expect an exception to 84 // be thrown by Flushables.flush; doFlush(Flushable flushable, boolean swallowException, boolean expectThrown)85 private void doFlush(Flushable flushable, boolean swallowException, boolean expectThrown) 86 throws IOException { 87 try { 88 Flushables.flush(flushable, swallowException); 89 if (expectThrown) { 90 fail("Didn't throw exception."); 91 } 92 } catch (IOException e) { 93 if (!expectThrown) { 94 fail("Threw exception"); 95 } 96 } 97 verify(flushable).flush(); 98 } 99 } 100