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

guava-testlib/test/com/google/common/testing/SerializableTesterTest.java
137 строк4 KB
Kurt Alfred Kluever
Migrate parts of `javatests/com/google/common/testing/...` from JUnit3 to JUnit4, so that we can use `TestParameterInjector` in an upcoming CL.
26 июн 2026, 02:12
26 июн 2026, 02:126dc6797
/*
 * Copyright (C) 2009 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.testing.SerializableTester.reserializeAndAssert;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.fail;

import java.io.Serializable;
import junit.framework.AssertionFailedError;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;
import org.junit.Test;

/**
 * Tests for {@link SerializableTester}.
 *
 * @author Nick Kralevich
 */
@NullUnmarked
public class SerializableTesterTest {
  @Test
  public void stringAssertions() {
    String original = "hello world";
    String copy = reserializeAndAssert(original);
    assertThat(copy).isNotSameInstanceAs(original);
  }

  @Test
  public void classWhichDoesNotImplementEquals() {
    ClassWhichDoesNotImplementEquals orig = new ClassWhichDoesNotImplementEquals();
    boolean errorNotThrown = false;
    try {
      reserializeAndAssert(orig);
      errorNotThrown = true;
    } catch (AssertionFailedError error) {
      // expected
      assertContains("must be Object#equals to", error.getMessage());
    }
    assertFalse(errorNotThrown);
  }

  @Test
  public void classWhichIsAlwaysEqualButHasDifferentHashcodes() {
    ClassWhichIsAlwaysEqualButHasDifferentHashcodes orig =
        new ClassWhichIsAlwaysEqualButHasDifferentHashcodes();
    boolean errorNotThrown = false;
    try {
      reserializeAndAssert(orig);
      errorNotThrown = true;
    } catch (AssertionFailedError error) {
      // expected
      assertContains("must be equal to the Object#hashCode", error.getMessage());
    }
    assertFalse(errorNotThrown);
  }

  @Test
  public void objectWhichIsEqualButChangesClass() {
    ObjectWhichIsEqualButChangesClass orig = new ObjectWhichIsEqualButChangesClass();
    boolean errorNotThrown = false;
    try {
      reserializeAndAssert(orig);
      errorNotThrown = true;
    } catch (AssertionFailedError error) {
      // expected
      assertContains("expected:<class ", error.getMessage());
    }
    assertFalse(errorNotThrown);
  }

  private static class ClassWhichDoesNotImplementEquals implements Serializable {
    private static final long serialVersionUID = 1L;
  }

  private static class ClassWhichIsAlwaysEqualButHasDifferentHashcodes implements Serializable {
    private static final long serialVersionUID = 2L;

    @SuppressWarnings("EqualsHashCode")
    @Override
    public boolean equals(@Nullable Object other) {
      return (other instanceof ClassWhichIsAlwaysEqualButHasDifferentHashcodes);
    }
  }

  private static class ObjectWhichIsEqualButChangesClass implements Serializable {
    private static final long serialVersionUID = 1L;

    @Override
    public boolean equals(@Nullable Object other) {
      return (other instanceof ObjectWhichIsEqualButChangesClass || other instanceof OtherForm);
    }

    @Override
    public int hashCode() {
      return 1;
    }

    private Object writeReplace() {
      return new OtherForm();
    }

    private static class OtherForm implements Serializable {
      @Override
      public boolean equals(@Nullable Object other) {
        return (other instanceof ObjectWhichIsEqualButChangesClass || other instanceof OtherForm);
      }

      @Override
      public int hashCode() {
        return 1;
      }
    }
  }

  private static void assertContains(String expectedSubstring, String actual) {
    // TODO(kevinb): use a Truth assertion here
    if (!actual.contains(expectedSubstring)) {
      fail("expected <" + actual + "> to contain <" + expectedSubstring + ">");
    }
  }
}