@Test
    @DisplayName("Calling a method on null reference throws NPE")
    void nullReference_throwsNPE() {
        // Arrange
        FileEntry e = null;
        // Act & Assert: demonstrate invalid usage results in NPE
        assertThrows(NullPointerException.class, () -> e.getName());
    }

    @Nested
    @DisplayName("Mockito stubbing for edge cases")
    class MockitoEdgeCases {
        @Test

{* ../../docs_src/body/tutorial001_py310.py hl[16] *}

... und deklarieren Sie dessen Typ als das Modell, welches Sie erstellt haben, `Item`.

## Resultate { #results }

Mit nur dieser Python-Typdeklaration wird **FastAPI**:

* Den Requestbody als JSON lesen.
* Die entsprechenden Typen konvertieren (falls nötig).
* Diese Daten validieren.

    @TaskAction
    fun action() {
        val results = mutableListOf<Pair<String, String>>()

        for (packageInfoFile in packageInfoFiles.files) {
            val packageLine = packageInfoFile.useLines { lines -> lines.first { it.startsWith("package") } }
            val packageName = packageLineRegex.find(packageLine)!!.groupValues[1]
            results.add(packageName to packageInfoFile.relativeTo(baseDir).path)
        }

            },
            {
                "name": "Baz",
                "price": "thirty five point four",
            },
        ],
    ),
):
    results = {"item_id": item_id, "item": item}

                {
                    "name": "Baz",
                    "price": "thirty five point four",
                },
            ],
        ),
    ],
):
    results = {"item_id": item_id, "item": item}

{* ../../docs_src/body/tutorial001_py310.py hl[16] *}

...y declara su tipo como el modelo que creaste, `Item`.

## Resultados { #results }

Con solo esa declaración de tipo en Python, **FastAPI** hará lo siguiente:

* Leer el body del request como JSON.
* Convertir los tipos correspondientes (si es necesario).
* Validar los datos.

        final Path result1 = indexExportJob.buildFilePath("/export", "not valid %%%", new HtmlIndexExportFormatter());
        final Path result2 = indexExportJob.buildFilePath("/export", "not valid %%%", new HtmlIndexExportFormatter());
        assertEquals(result1, result2);
    }

    @Test
    public void test_buildFilePath_differentHashForDifferentUrls() {

                "value": {
                    "name": "Baz",
                    "price": "thirty five point four",
                },
            },
        },
    ),
):
    results = {"item_id": item_id, "item": item}

   *       (<i>symmetric</i> property)
   *   <li>If {@code equivalent(x, y)} and {@code equivalent(y, z)} are both true, then {@code
   *       equivalent(x, z)} is also true (<i>transitive</i> property)
   * </ul>
   *
   * <p>Note that all calls to {@code equivalent(x, y)} are expected to return the same result as
   * long as neither {@code x} nor {@code y} is modified.
   */

        List<String> result = options.getDataConfigIdList();
        assertNotNull(result);
        assertEquals(4, result.size());
        assertTrue(result.contains("data1"));
        assertTrue(result.contains("data2"));
        assertTrue(result.contains("data3"));
        assertTrue(result.contains("data4"));
    }

    @Test
    public void test_Options_toString() {