content: /*
   * 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.sdk.coders;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.contains;
  import static org.hamcrest.Matchers.containsString;
  import static org.hamcrest.Matchers.equalTo;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  
  import java.util.Arrays;
  import java.util.Collections;
  import org.apache.beam.sdk.coders.Coder.Context;
  import org.apache.beam.sdk.coders.Coder.NonDeterministicException;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for constructs defined within {@link Coder}. */
  @RunWith(JUnit4.class)
  public class CoderTest {
    @Rule public ExpectedException expectedException = ExpectedException.none();
  
    @Test
    public void testContextEqualsAndHashCode() {
      assertEquals(Context.NESTED, new Context(false));
      assertEquals(Context.OUTER, new Context(true));
      assertNotEquals(Context.NESTED, Context.OUTER);
  
      assertEquals(Context.NESTED.hashCode(), new Context(false).hashCode());
      assertEquals(Context.OUTER.hashCode(), new Context(true).hashCode());
      // Even though this isn't strictly required by the hashCode contract,
      // we still want this to be true.
      assertNotEquals(Context.NESTED.hashCode(), Context.OUTER.hashCode());
    }
  
    @Test
    public void testContextToString() {
      assertEquals("Context{NESTED}", Context.NESTED.toString());
      assertEquals("Context{OUTER}", Context.OUTER.toString());
    }
  
    @Test
    public void testNonDeterministicExceptionRequiresReason() {
      expectedException.expect(IllegalArgumentException.class);
      expectedException.expectMessage("Reasons must not be empty");
      new NonDeterministicException(VoidCoder.of(), Collections.emptyList());
    }
  
    @Test
    public void testNonDeterministicException() {
      NonDeterministicException rootCause =
          new NonDeterministicException(VoidCoder.of(), "Root Cause");
      NonDeterministicException exception =
          new NonDeterministicException(StringUtf8Coder.of(), "Problem", rootCause);
      assertEquals(rootCause, exception.getCause());
      assertThat(exception.getReasons(), contains("Problem"));
      assertThat(exception.toString(), containsString("Problem"));
      assertThat(exception.toString(), containsString("is not deterministic"));
    }
  
    @Test
    public void testNonDeterministicExceptionMultipleReasons() {
      NonDeterministicException rootCause =
          new NonDeterministicException(VoidCoder.of(), "Root Cause");
      NonDeterministicException exception =
          new NonDeterministicException(
              StringUtf8Coder.of(), Arrays.asList("Problem1", "Problem2"), rootCause);
  
      String expectedMessage =
          "StringUtf8Coder is not deterministic because:\n\tProblem1\n\tProblem2";
  
      assertThat(exception.getMessage(), equalTo(expectedMessage));
    }
  
    @Test
    public void testTypeIsPreserved() throws Exception {
      assertThat(VoidCoder.of().getEncodedTypeDescriptor(), equalTo(TypeDescriptor.of(Void.class)));
    }
  }
  