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Java example source code file (FlushablesTest.java)

This example Java source code file (FlushablesTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

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didn't, flushablestest, ioexception, override, testcase, this, threw

The FlushablesTest.java Java example source code

/*
 * 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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