assertEquals(Integer.valueOf(1), map.replace("foo", 2));
    assertNull(map.replace("bar", 3));
    assertEquals(Integer.valueOf(2), map.get("foo"));
    assertFalse(map.containsKey("bar"));
  }

  public void testReplaceConditional() {
    TestMap map = new TestMap();
    map.put("foo", 1);
    assertFalse(map.replace("foo", 2, 3));
    assertFalse(map.replace("bar", 1, 2));

  },

  /**
   * The entry itself was not actually removed, but its value was replaced by the user. This can
   * result from the user invoking {@link Cache#put}, {@link LoadingCache#refresh}, {@link Map#put},
   * {@link Map#putAll}, {@link ConcurrentMap#replace(Object, Object)}, or {@link
   * ConcurrentMap#replace(Object, Object, Object)}.
   */
  REPLACED {
    @Override
    boolean wasEvicted() {
      return false;
    }
  },

    if (!condition) {
      throw new AssertionFailedError(
          template
              .replace("$RELATIONSHIP", relationshipName)
              .replace("$HASH", hashName)
              .replace("$ITEM", itemReporter.reportItem(item))
              .replace("$OTHER", itemReporter.reportItem(other)));
    }
  }

  private Item<T> getItem(int groupNumber, int itemNumber) {

  public void testReplaceEntry_supportedPresent() {
    assertTrue(getMap().replace(k0(), v0(), v3()));
    expectReplacement(entry(k0(), v3()));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testReplaceEntry_supportedPresentUnchanged() {
    assertTrue(getMap().replace(k0(), v0(), v0()));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_PUT)

    try {
      assertEquals(v0(), getMap().replace(k0(), v3()));
      expectReplacement(entry(k0(), v3()));
    } catch (ClassCastException tolerated) { // for ClassToInstanceMap
      expectUnchanged();
    }
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testReplace_supportedPresentNoChange() {
    assertEquals(v0(), getMap().replace(k0(), v0()));
    expectUnchanged();
  }

    return delegate().remove(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  public V replace(K key, V value) {
    return delegate().replace(key, value);
  }

  @CanIgnoreReturnValue
  @Override
  public boolean replace(K key, V oldValue, V newValue) {
    return delegate().replace(key, oldValue, newValue);
  }

  public void testReplaceEntry_supportedPresent() {
    assertTrue(getMap().replace(k0(), v0(), v3()));
    expectReplacement(entry(k0(), v3()));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testReplaceEntry_supportedPresentUnchanged() {
    assertTrue(getMap().replace(k0(), v0(), v0()));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_PUT)

@ElementTypesAreNonnullByDefault
public abstract class AbstractCollectionTester<E extends @Nullable Object>
    extends AbstractContainerTester<Collection<E>, E> {

  // TODO: replace this with an accessor.
  protected Collection<E> collection;

  @Override
  protected Collection<E> actualContents() {
    return collection;
  }

  // TODO: dispose of this once collection is encapsulated.

  },

  /**
   * The entry itself was not actually removed, but its value was replaced by the user. This can
   * result from the user invoking {@link Cache#put}, {@link LoadingCache#refresh}, {@link Map#put},
   * {@link Map#putAll}, {@link ConcurrentMap#replace(Object, Object)}, or {@link
   * ConcurrentMap#replace(Object, Object, Object)}.
   */
  REPLACED {
    @Override
    boolean wasEvicted() {
      return false;
    }
  },

  public void testReplace_supportedPresent() {
    assertEquals(v0(), getMap().replace(k0(), v3()));
    expectReplacement(entry(k0(), v3()));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testReplace_supportedPresentNoChange() {
    assertEquals(v0(), getMap().replace(k0(), v0()));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_PUT)