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   * 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.
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  package org.apache.beam.sdk.extensions.kryo;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  import java.util.Collections;
  import org.apache.beam.sdk.coders.CannotProvideCoderException;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.junit.Rule;
  import org.junit.Test;
  
  /** A collections of {@link KryoCoderProvider} unit tests. */
  public class KryoCoderProviderTest {
  
    @Rule public TestPipeline pipeline = TestPipeline.create();
  
    @Test
    public void testBuilding() {
      KryoCoderProvider provider = KryoCoderProvider.of(pipeline.getOptions());
      assertNotNull(provider);
    }
  
    @Test
    public void testBuildingAndRegister() {
      KryoCoderProvider.of(pipeline.getOptions()).registerTo(pipeline);
    }
  
    @Test
    public void testItProvidesCodersToRegisteredClasses() throws CannotProvideCoderException {
      final KryoCoderProvider provider =
          KryoCoderProvider.of(
              pipeline.getOptions(),
              kryo -> {
                kryo.register(FirstTestClass.class);
                kryo.register(SecondTestClass.class);
                kryo.register(ThirdTestClass.class);
              });
      assertProviderReturnsKryoCoderForClass(provider, FirstTestClass.class);
      assertProviderReturnsKryoCoderForClass(provider, SecondTestClass.class);
      assertProviderReturnsKryoCoderForClass(provider, ThirdTestClass.class);
    }
  
    @Test(expected = CannotProvideCoderException.class)
    public void testDoNotProvideCoderForUnregisteredClasses() throws CannotProvideCoderException {
      final KryoCoderProvider provider =
          KryoCoderProvider.of(
              pipeline.getOptions(),
              kryo -> {
                kryo.register(FirstTestClass.class);
                kryo.register(SecondTestClass.class);
                kryo.register(ThirdTestClass.class);
              });
      provider.coderFor(TypeDescriptor.of(NeverRegisteredClass.class), Collections.emptyList());
    }
  
    @Test
    public void testProviderRegisteredToPipeline() throws CannotProvideCoderException {
      KryoCoderProvider.of(pipeline.getOptions(), kryo -> kryo.register(FirstTestClass.class))
          .registerTo(pipeline);
      final Coder<FirstTestClass> coderToAssert =
          pipeline.getCoderRegistry().getCoder(FirstTestClass.class);
      assertNotNull(coderToAssert);
      assertTrue(coderToAssert instanceof KryoCoder);
      final KryoCoder<FirstTestClass> casted = (KryoCoder<FirstTestClass>) coderToAssert;
      assertEquals(1, casted.getRegistrars().size());
    }
  
    @Test(expected = CannotProvideCoderException.class)
    public void testPrimitiveClass() throws CannotProvideCoderException {
      final KryoCoderProvider provider = KryoCoderProvider.of(pipeline.getOptions());
      provider.coderFor(TypeDescriptors.strings(), Collections.emptyList());
    }
  
    private static <T> void assertProviderReturnsKryoCoderForClass(
        KryoCoderProvider provider, Class<T> type) throws CannotProvideCoderException {
      assertTrue(provider.getCoder().getRegistrars().size() > 0);
      final Coder<T> coderToAssert =
          provider.coderFor(TypeDescriptor.of(type), Collections.emptyList());
      assertNotNull(coderToAssert);
      assertTrue(coderToAssert instanceof KryoCoder);
      final KryoCoder<T> casted = (KryoCoder<T>) coderToAssert;
      assertEquals(provider.getCoder().getInstanceId(), casted.getInstanceId());
    }
  
    private static class FirstTestClass {}
  
    private static class SecondTestClass {}
  
    private static class ThirdTestClass {}
  
    private static class NeverRegisteredClass {}
  }
  