}

        /**
         * Verifies that isStale returns true for a stale handle.
         */
        @Test
        public void testIsStale_ReturnsTrueWhenStale() {
            when(smbPipeHandle.isStale()).thenReturn(true);
            assertTrue(smbPipeHandle.isStale(), "isStale() should return true for a stale handle.");
        }

        innerBuilder.add(new TermQuery(new Term("content", "inner")), BooleanClause.Occur.SHOULD);

        BooleanQuery.Builder outerBuilder = new BooleanQuery.Builder();
        outerBuilder.add(innerBuilder.build(), BooleanClause.Occur.SHOULD);
        outerBuilder.add(new TermQuery(new Term("content", "outer")), BooleanClause.Occur.SHOULD);
        BooleanQuery nestedQuery = outerBuilder.build();

    assertFalse(
        "Two Sets should not be equal if exactly one of them contains null.",
        getSet().equals(other));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)
  public void testEquals_smallerSet() {
    Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
    assertFalse(
        "Sets of different sizes should not be equal.",

    assertFalse(
        "A List should not equal another List containing different elements.",
        getList().equals(other));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)
  public void testEquals_otherListContainingNull() {
    List<E> other = new ArrayList<>(getSampleElements());
    other.set(other.size() / 2, null);
    assertFalse(

    assertFalse(
        "Two Sets should not be equal if exactly one of them contains null.",
        getSet().equals(other));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)
  public void testEquals_smallerSet() {
    Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
    assertFalse(
        "Sets of different sizes should not be equal.",

            assertNotNull(description, "Description should not be null");
            assertFalse(description.trim().isEmpty(), "Description should not be empty");
            assertTrue(
                    description.toLowerCase().contains("compatibility")
                            || description.toLowerCase().contains("fix"),
                    "Description should mention compatibility or fix");
        }
    }

	if len(pets) != 1 {
		t.Fatalf("should only find one pets, but got %v", len(pets))
	}

	CheckPet(t, pets[0], *user.Pets[0])

	if count := DB.Model(&user).Where("name = ?", user.Pets[1].Name).Association("Pets").Count(); count != 1 {
		t.Fatalf("should only find one pets, but got %v", count)
	}

    /**
     * Test for the writeParameterWordsWireFormat method.
     * It should always return 0.
     */
    @Test
    void testWriteParameterWordsWireFormat() {
        assertEquals(0, response.writeParameterWordsWireFormat(buffer, 0), "writeParameterWordsWireFormat should return 0");
    }

    /**
     * Test for the writeBytesWireFormat method.
     * It should always return 0.
     */
    @Test

In this case, you could want to document how that external API *should* look like. What *path operation* it should have, what body it should expect, what response it should return, etc.

## An app with callbacks { #an-app-with-callbacks }

Let's see all this with an example.

Imagine you develop an app that allows creating invoices.

    class ConstructorTests {

        @Test
        @DisplayName("Should create response with configuration")
        void testConstructor() {
            Smb2EchoResponse response = new Smb2EchoResponse(mockConfig);
            assertNotNull(response);
            assertEquals(mockConfig, response.getConfig());
        }

        @Test
        @DisplayName("Should extend ServerMessageBlock2Response")
        void testInheritance() {