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/*
* Copyright (C) 2012 The Guava 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 com.google.common.io;
import static org.easymock.EasyMock.createStrictMock;
import static org.easymock.EasyMock.expectLastCall;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.reset;
import static org.easymock.EasyMock.verify;
import junit.framework.TestCase;
import java.io.Flushable;
import java.io.IOException;
/**
* Unit tests for {@link Flushables}.
*
* <p>Checks proper flushing behavior, and ensures that
* IOExceptions on Flushable.flush() are not
* propagated out from the {@link Flushables#flush} method if {@code
* swallowException} is true.
*
* @author Michael Lancaster
*/
public class FlushablesTest extends TestCase {
private Flushable mockFlushable;
public void testFlush_clean() throws IOException {
// make sure that no exception is thrown regardless of value of
// 'swallowException' when the mock does not throw an exception.
setupFlushable(false);
doFlush(mockFlushable, false, false);
setupFlushable(false);
doFlush(mockFlushable, true, false);
}
public void testFlush_flushableWithEatenException() throws IOException {
// make sure that no exception is thrown if 'swallowException' is true
// when the mock does throw an exception on flush.
setupFlushable(true);
doFlush(mockFlushable, true, false);
}
public void testFlush_flushableWithThrownException() throws IOException {
// make sure that the exception is thrown if 'swallowException' is false
// when the mock does throw an exception on flush.
setupFlushable(true);
doFlush(mockFlushable, false, true);
}
public void testFlushQuietly_flushableWithEatenException()
throws IOException {
// make sure that no exception is thrown by flushQuietly when the mock does
// throw an exception on flush.
setupFlushable(true);
Flushables.flushQuietly(mockFlushable);
}
@Override protected void setUp() throws Exception {
mockFlushable = createStrictMock(Flushable.class);
}
private void expectThrown() {
expectLastCall().andThrow(new IOException("This should only appear in the "
+ "logs. It should not be rethrown."));
}
// Set up a flushable to expect to be flushed, and optionally to
// throw an exception.
private void setupFlushable(boolean shouldThrowOnFlush) throws IOException {
reset(mockFlushable);
mockFlushable.flush();
if (shouldThrowOnFlush) {
expectThrown();
}
replay(mockFlushable);
}
// Flush the flushable using the Flushables, passing in the swallowException
// parameter. expectThrown determines whether we expect an exception to
// be thrown by Flushables.flush;
private void doFlush(Flushable flushable, boolean swallowException,
boolean expectThrown) {
try {
Flushables.flush(flushable, swallowException);
if (expectThrown) {
fail("Didn't throw exception.");
}
} catch (IOException e) {
if (!expectThrown) {
fail("Threw exception");
}
}
verify(flushable);
}
}
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