sdks/java/core/src/test/java/org/apache/beam/sdk/values/TupleTagTest.java

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 * 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
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 * Unless required by applicable law or agreed to in writing, software
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package org.apache.beam.sdk.values;

import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.startsWith;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertThat;

import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Splitter;
import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Iterables;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link TupleTag}. */
@RunWith(JUnit4.class)
public class TupleTagTest {

  private static TupleTag<Object> staticTag = new TupleTag<>();
  private static TupleTag<Object> staticBlockTag;
  private static TupleTag<Object> staticMethodTag = createTag();
  private static TupleTag<Object> instanceMethodTag = new AnotherClass().createAnotherTag();

  static {
    staticBlockTag = new TupleTag<>();
  }

  private static TupleTag<Object> createTag() {
    return new TupleTag<>();
  }

  private static class AnotherClass {
    private static TupleTag<Object> anotherTag = new TupleTag<>();

    private TupleTag<Object> createAnotherTag() {
      return new TupleTag<>();
    }
  }

  @Test
  public void testStaticTupleTag() {
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#0", staticTag.getId());
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#3", staticBlockTag.getId());
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#1", staticMethodTag.getId());
    assertEquals("org.apache.beam.sdk.values.TupleTagTest#2", instanceMethodTag.getId());
    assertEquals(
        "org.apache.beam.sdk.values.TupleTagTest$AnotherClass#0", AnotherClass.anotherTag.getId());
  }

  private TupleTag<Object> createNonstaticTupleTag() {
    return new TupleTag<>();
  }

  @Test
  public void testNonstaticTupleTag() {
    assertNotEquals(new TupleTag<>().getId(), new TupleTag<>().getId());
    assertNotEquals(createNonstaticTupleTag(), createNonstaticTupleTag());

    TupleTag<Object> tag = createNonstaticTupleTag();

    // Check that the name is derived from the method it is created in.
    assertThat(
        Iterables.get(Splitter.on('#').split(tag.getId()), 0),
        startsWith("org.apache.beam.sdk.values.TupleTagTest.createNonstaticTupleTag"));

    // Check that after the name there is a ':' followed by a line number, and just make
    // sure the line number is big enough to be reasonable, so superficial changes don't break
    // the test.
    assertThat(
        Integer.parseInt(
            Iterables.get(
                Splitter.on(':').split(Iterables.get(Splitter.on('#').split(tag.getId()), 0)), 1)),
        greaterThan(15));
  }
}