Java example source code file (ByteSinkTester.java)

This example Java source code file (ByteSinkTester.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.

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Java - Java tags/keywords

androidincompatible, bytearrayinputstream, bytesinkfactory, bytesinktester, charsinkfactory, immutablelist, ioexception, method, outputstream, override, reflection, sourcesinktester, string, testsuite, util

The ByteSinkTester.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 com.google.common.io.SourceSinkFactory.ByteSinkFactory;
import static com.google.common.io.SourceSinkFactory.CharSinkFactory;
import static org.junit.Assert.assertArrayEquals;

import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;

import junit.framework.TestSuite;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.Map;

/**
 * A generator of {@code TestSuite} instances for testing {@code ByteSink} implementations.
 * Generates tests of a all methods on a {@code ByteSink} given various inputs written to it as well
 * as sub-suites for testing the {@code CharSink} view in the same way.
 *
 * @author Colin Decker
 */
@AndroidIncompatible // Android doesn't understand tests that lack default constructors.
public class ByteSinkTester extends SourceSinkTester<ByteSink, byte[], ByteSinkFactory> {

  private static final ImmutableList<Method> testMethods
      = getTestMethods(ByteSinkTester.class);

  static TestSuite tests(String name, ByteSinkFactory factory) {
    TestSuite suite = new TestSuite(name);
    for (Map.Entry<String, String> entry : TEST_STRINGS.entrySet()) {
      String desc = entry.getKey();
      TestSuite stringSuite = suiteForString(name, factory, entry.getValue(), desc);
      suite.addTest(stringSuite);
    }
    return suite;
  }

  private static TestSuite suiteForString(String name, ByteSinkFactory factory,
      String string, String desc) {
    byte[] bytes = string.getBytes(Charsets.UTF_8);
    TestSuite suite = suiteForBytes(name, factory, desc, bytes);
    CharSinkFactory charSinkFactory = SourceSinkFactories.asCharSinkFactory(factory);
    suite.addTest(CharSinkTester.suiteForString(name + ".asCharSink[Charset]", charSinkFactory,
        string, desc));
    return suite;
  }

  private static TestSuite suiteForBytes(String name, ByteSinkFactory factory,
      String desc, byte[] bytes) {
    TestSuite suite = new TestSuite(name + " [" + desc + "]");
    for (final Method method : testMethods) {
      suite.addTest(new ByteSinkTester(factory, bytes, name, desc, method));
    }
    return suite;
  }

  private ByteSink sink;

  ByteSinkTester(ByteSinkFactory factory, byte[] data, String suiteName,
      String caseDesc, Method method) {
    super(factory, data, suiteName, caseDesc, method);
  }

  @Override
  protected void setUp() throws Exception {
    sink = factory.createSink();
  }

  public void testOpenStream() throws IOException {
    OutputStream out = sink.openStream();
    try {
      ByteStreams.copy(new ByteArrayInputStream(data), out);
    } finally {
      out.close();
    }

    assertContainsExpectedBytes();
  }

  public void testOpenBufferedStream() throws IOException {
    OutputStream out = sink.openBufferedStream();
    try {
      ByteStreams.copy(new ByteArrayInputStream(data), out);
    } finally {
      out.close();
    }

    assertContainsExpectedBytes();
  }

  public void testWrite() throws IOException {
    sink.write(data);

    assertContainsExpectedBytes();
  }

  public void testWriteFrom_inputStream() throws IOException {
    sink.writeFrom(new ByteArrayInputStream(data));

    assertContainsExpectedBytes();
  }

  private void assertContainsExpectedBytes() throws IOException {
    assertArrayEquals(expected, factory.getSinkContents());
  }
}