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gRPC: Integration Testing
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/*
 * Copyright 2014, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package io.grpc.testing.integration;

import com.google.protobuf.MessageLite;

import io.grpc.Metadata;
import io.grpc.protobuf.ProtoUtils;

import org.junit.Assert;

import java.util.List;

/**
 * Utility methods to support integration testing.
 */
public class Util {

  public static final Metadata.Key METADATA_KEY =
      ProtoUtils.keyForProto(Messages.SimpleContext.getDefaultInstance());

  /** Assert that two messages are equal, producing a useful message if not. */
  public static void assertEquals(MessageLite expected, MessageLite actual) {
    if (expected == null || actual == null) {
      Assert.assertEquals(expected, actual);
    } else {
      if (!expected.equals(actual)) {
        // This assertEquals should always complete.
        Assert.assertEquals(expected.toString(), actual.toString());
        // But if it doesn't, then this should.
        Assert.assertEquals(expected, actual);
        Assert.fail("Messages not equal, but assertEquals didn't throw");
      }
    }
  }

  /** Assert that two lists of messages are equal, producing a useful message if not. */
  public static void assertEquals(List expected,
      List actual) {
    if (expected == null || actual == null) {
      Assert.assertEquals(expected, actual);
    } else if (expected.size() != actual.size()) {
      Assert.assertEquals(expected, actual);
    } else {
      for (int i = 0; i < expected.size(); i++) {
        assertEquals(expected.get(i), actual.get(i));
      }
    }
  }
}