android/guava-testlib/test/com/google/common/testing/TearDownStackTest.java - master - githubmirror/guava

android/guava-testlib/test/com/google/common/testing/TearDownStackTest.java
167 строк4 KB
cpovirk
Use yet more `assertThrows` (and a tiny bit more Truth).
27 июн 2026, 01:53
27 июн 2026, 01:53d160300
/*
 * Copyright (C) 2010 The Guava Authors
 *
 * Licensed 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 com.google.common.testing;

import static com.google.common.collect.Iterables.getOnlyElement;
import static com.google.common.truth.Truth.assertThat;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertThrows;

import com.google.common.annotations.GwtCompatible;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * @author Luiz-Otavio "Z" Zorzella
 */
@GwtCompatible
@NullUnmarked
public class TearDownStackTest extends TestCase {

  private final TearDownStack tearDownStack = new TearDownStack();

  public void testSingleTearDown() {
    TearDownStack stack = buildTearDownStack();

    SimpleTearDown tearDown = new SimpleTearDown();
    stack.addTearDown(tearDown);

    assertEquals(false, tearDown.ran);

    stack.runTearDown();

    assertEquals("tearDown should have run", true, tearDown.ran);
  }

  public void testMultipleTearDownsHappenInOrder() {
    TearDownStack stack = buildTearDownStack();

    SimpleTearDown tearDownOne = new SimpleTearDown();
    stack.addTearDown(tearDownOne);

    Callback callback =
        new Callback() {
          @Override
          public void run() {
            assertEquals(
                "tearDownTwo should have been run before tearDownOne", false, tearDownOne.ran);
          }
        };

    SimpleTearDown tearDownTwo = new SimpleTearDown(callback);
    stack.addTearDown(tearDownTwo);

    assertEquals(false, tearDownOne.ran);
    assertEquals(false, tearDownTwo.ran);

    stack.runTearDown();

    assertEquals("tearDownOne should have run", true, tearDownOne.ran);
    assertEquals("tearDownTwo should have run", true, tearDownTwo.ran);
  }

  public void testThrowingTearDown() {
    TearDownStack stack = buildTearDownStack();

    ThrowingTearDown tearDownOne = new ThrowingTearDown("one");
    stack.addTearDown(tearDownOne);

    ThrowingTearDown tearDownTwo = new ThrowingTearDown("two");
    stack.addTearDown(tearDownTwo);

    assertEquals(false, tearDownOne.ran);
    assertEquals(false, tearDownTwo.ran);

    RuntimeException expected = assertThrows(RuntimeException.class, () -> stack.runTearDown());
    assertThat(expected).hasMessageThat().isEqualTo("two");
    assertThat(getOnlyElement(asList(expected.getSuppressed()))).hasMessageThat().isEqualTo("one");

    assertEquals(true, tearDownOne.ran);
    assertEquals(true, tearDownTwo.ran);
  }

  @Override
  public final void runBare() throws Throwable {
    try {
      setUp();
      runTest();
    } finally {
      tearDown();
    }
  }

  @Override
  protected void tearDown() {
    tearDownStack.runTearDown();
  }

  /** Builds a {@link TearDownStack} that makes sure it's clear by the end of this test. */
  private TearDownStack buildTearDownStack() {
    TearDownStack result = new TearDownStack();
    tearDownStack.addTearDown(
        () -> {
          synchronized (result.lock) {
            assertEquals(
                "The test should have cleared the stack (say, by virtue of running runTearDown)",
                0,
                result.stack.size());
          }
        });
    return result;
  }

  private static final class ThrowingTearDown implements TearDown {

    private final String id;
    boolean ran = false;

    ThrowingTearDown(String id) {
      this.id = id;
    }

    @Override
    public void tearDown() {
      ran = true;
      throw new RuntimeException(id);
    }
  }

  private static final class SimpleTearDown implements TearDown {

    boolean ran = false;
    @Nullable Callback callback = null;

    SimpleTearDown() {}

    SimpleTearDown(Callback callback) {
      this.callback = callback;
    }

    @Override
    public void tearDown() {
      if (callback != null) {
        callback.run();
      }
      ran = true;
    }
  }

  private interface Callback {
    void run();
  }
}