runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/DataflowMatchers.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 org.apache.beam.runners.dataflow.worker;

import java.io.Serializable;
import org.apache.beam.vendor.grpc.v1p13p1.com.google.protobuf.ByteString;
import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;

/** Matchers that are useful when writing Dataflow tests. */
public class DataflowMatchers {
  /** Matcher for {@link ByteString} that prints the strings in UTF8. */
  public static class ByteStringMatcher extends TypeSafeMatcher<ByteString>
      implements Serializable {
    private ByteString expected;

    private ByteStringMatcher(ByteString expected) {
      this.expected = expected;
    }

    public static ByteStringMatcher byteStringEq(ByteString expected) {
      return new ByteStringMatcher(expected);
    }

    @Override
    public void describeTo(Description description) {
      description.appendText("ByteString(").appendText(expected.toStringUtf8()).appendText(")");
    }

    @Override
    public void describeMismatchSafely(ByteString actual, Description description) {
      description.appendText("was ByteString(").appendText(actual.toStringUtf8()).appendText(")");
    }

    @Override
    protected boolean matchesSafely(ByteString actual) {
      return actual.equals(expected);
    }
  }
}