CopyHelperTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 gobblin.fork;

import java.io.ByteArrayInputStream;
import java.util.Random;

import org.testng.Assert;
import org.testng.annotations.Test;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

@Test
public class CopyHelperTest {

  private static final Random RANDOM = new Random();

  @Test
  public void testCopyable()
      throws CopyNotSupportedException {

    Copyable c = mock(Copyable.class);
    Assert.assertTrue(CopyHelper.isCopyable(c));

    Object copy = new Object();
    when(c.copy()).thenReturn(copy);
    Assert.assertEquals(CopyHelper.copy(c, 0), copy);
    Assert.assertEquals(CopyHelper.copy(c, 1), copy);

  }

  @Test
  public void testByteArray()
      throws CopyNotSupportedException {

    int length = RANDOM.nextInt(200);
    byte[] bytes = new byte[length];
    RANDOM.nextBytes(bytes);

    Assert.assertTrue(CopyHelper.isCopyable(bytes));

    byte[] copiedBytes = (byte[]) CopyHelper.copy(bytes, 0);
    Assert.assertTrue(copiedBytes == bytes, "Copied bytes reference should be same for the first copy");

    copiedBytes = (byte[]) CopyHelper.copy(bytes, 1);
    Assert.assertTrue(copiedBytes != bytes, "Copied bytes reference should be different for every copy after that");
    Assert.assertEquals(copiedBytes, bytes, "Copied bytes value should be the same");
  }

  @Test
  public void testImmutables()
      throws CopyNotSupportedException {

    Object nullObject = null;

    Integer integer = RANDOM.nextInt(200);

    byte[] bytes = new byte[integer];
    RANDOM.nextBytes(bytes);

    String string = new String(bytes);

    Long longNum = RANDOM.nextLong();

    Object[] immutables = new Object[]{nullObject, integer, string, longNum};

    for (Object immutable : immutables) {
      Assert.assertTrue(CopyHelper.isCopyable(immutable));
      for (int i=0; i < 2; ++i) {
        Object copiedObject = CopyHelper.copy(immutable, i);
        Assert.assertEquals(copiedObject, immutable);
      }
    }
  }

  @Test
  public void testUnsupportedTypes()
      throws CopyNotSupportedException {
    Object foobar = mock(ByteArrayInputStream.class);
    try {
      CopyHelper.copy(foobar, 0);
    } catch (CopyNotSupportedException cnse) {
      Assert.fail("Should not throw exception");
    }
    try {
      CopyHelper.copy(foobar, 1);
      Assert.fail("Should throw exception");
    } catch (CopyNotSupportedException cnse) {
    } catch (Exception e) {
      Assert.fail("Should not throw any exception other than CopyNotSupportedException. ", e);
    }
  }

}