assertFalse(r1.hashCode() == r3.hashCode());

        assertTrue(r1.equals(r2), "Expected " + r1 + " to equal " + r2);
        assertTrue(r2.equals(r1), "Expected " + r2 + " to equal " + r1);

        assertFalse(r1.equals(r3), "Expected " + r1 + " to not equal " + r3);
        assertFalse(r3.equals(r1), "Expected " + r3 + " to not equal " + r1);
    }

        "Two Maps should not be equal if exactly one of them contains a null value.",
        getMap().equals(other));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)
  public void testEquals_smallerMap() {
    Collection<Entry<K, V>> fewerEntries = getSampleEntries(getNumEntries() - 1);
    assertFalse(
        "Maps of different sizes should not be equal.", getMap().equals(newHashMap(fewerEntries)));
  }

}

func TestEqual(t *testing.T) {
	for i, test := range equalTests {
		A, err := Parse(test.A)
		if err != nil {
			t.Fatalf("Test %d: %v", i, err)
		}
		B, err := Parse(test.B)
		if err != nil {
			t.Fatalf("Test %d: %v", i, err)
		}
		if equal := Equal(A, B); equal != test.Equal {
			t.Fatalf("Test %d: got %v - want %v", i, equal, test.Equal)
		}
	}
}

	switch op {
	case opLt:
		return left.Before(right)
	case opLte:
		return left.Before(right) || left.Equal(right)
	case opGt:
		return left.After(right)
	case opGte:
		return left.After(right) || left.Equal(right)
	case opEq:
		return left.Equal(right)
	case opIneq:
		return !left.Equal(right)
	}
	// This case does not happen
	return false

    assertTrue("An Object should be equal to itself.", collection.equals(collection));
  }

  // Comparisons to null *are* defined.
  @SuppressWarnings("UndefinedEquals")
  public void testEquals_null() {
    // noinspection ObjectEqualsNull
    assertFalse("An object should not be equal to null.", collection.equals(null));
  }

  // A collection should essentially never be equal to a non-collection.

     * Implementations must ensure that if two requests are equal according to
     * {@link #equals(Object)}, they have the same hashcode.
     *
     * @return a hash code value for this request
     */
    @Override
    int hashCode();

    /**
     * Returns {@code true} if the specified object is equal to this request.
     * Two requests are considered equal if they have the same type and all
     * significant fields are equal.

      assertTrue(item + " must not be Object#equals to null", !item.equals(null));
      assertTrue(
          item + " must not be Object#equals to an arbitrary object of another class",
          !item.equals(NotAnInstance.EQUAL_TO_NOTHING));
      assertTrue(item + " must be Object#equals to itself", item.equals(item));
      assertEquals(

	if err != nil {
		t.Fatalf("expected nil err, got %v", err)
	}

	if !t1.Equal(t2) {
		t.Fatalf("expected time to be equal: %s != %s", t1, t2)
	}

	time.Sleep(3 * time.Second)

	t3, err := cache.GetWithCtx(ctx)
	if err != nil {
		t.Fatalf("expected nil err, got %v", err)
	}

	if t1.Equal(t3) {
		t.Fatalf("expected time to be un-equal: %s == %s", t1, t3)
	}
}

func TestCache(t *testing.T) {

    assertTrue(Objects.equal(1, 1));
    assertTrue(Objects.equal(null, null));

    // test distinct string objects
    String s1 = "foobar";
    String s2 = new String(s1);
    assertTrue(Objects.equal(s1, s2));

    assertFalse(Objects.equal(s1, null));
    assertFalse(Objects.equal(null, s1));
    assertFalse(Objects.equal("foo", "bar"));
    assertFalse(Objects.equal("1", 1));
  }

   * the same structural relationships as those in this graph.
   *
   * <p>Thus, two value graphs A and B are equal if <b>all</b> of the following are true:
   *
   * <ul>
   *   <li>A and B have equal {@link #isDirected() directedness}.
   *   <li>A and B have equal {@link #nodes() node sets}.
   *   <li>A and B have equal {@link #edges() edge sets}.
   *   <li>The {@link #edgeValue(N, N) value} of a given edge is the same in both A and B.