func (d *dataUsageCache) deserialize(r io.Reader) error {
	var b [1]byte
	n, _ := r.Read(b[:])
	if n != 1 {
		return io.ErrUnexpectedEOF
	}
	ver := int(b[0])
	switch ver {
	case dataUsageCacheVerV1:
		return errors.New("cache version deprecated (will autoupdate)")
	case dataUsageCacheVerV2:
		// Zstd compressed.

  private static final class BelowAll extends Cut<Comparable<?>> {
    private static final BelowAll INSTANCE = new BelowAll();

    private BelowAll() {
      /*
       * No code ever sees this bogus value for `endpoint`: This class overrides both methods that
       * use the `endpoint` field, compareTo() and endpoint(). Additionally, the main implementation

        @CsvSource({ "0, 0", "1, User", "2, Domain group", "3, Domain", "4, Local group", "5, Builtin group", "6, Deleted", "7, Invalid",
                "8, Unknown" })
        @DisplayName("getType and getTypeText cover all types")
        void testGetTypeAndText(int type, String text) {
            byte[] ident = new byte[] { 0, 0, 0, 0, 0, 5 };
            SID sid = new SID(buildSidT((byte) 1, ident, 42), type, "DOM", "acct", false);

{* ../../docs_src/app_testing/test_main.py hl[3] *}

...y tener el código para las pruebas tal como antes.

## Pruebas: ejemplo extendido

Ahora extiende este ejemplo y añade más detalles para ver cómo escribir pruebas para diferentes partes.

### Archivo de aplicación **FastAPI** extendido

Continuemos con la misma estructura de archivos que antes:

```
.
├── app
│   ├── __init__.py

Você pode:

* <a href="https://github.com/tiangolo" class="external-link" target="_blank">Me siga no **GitHub**</a>.
    * Ver também outros projetos Open Source criados por mim que podem te ajudar.
    * Me seguir para saber quando um novo projeto Open Source for criado.

Validações específicas para textos:

* `min_length`
* `max_length`
* `regex`

Nesses exemplos você viu como declarar validações em valores do tipo `str`.

 * therefore every method of the listener will be called at most once. N.B. The {@link State#FAILED}
 * and {@link State#TERMINATED} states are terminal states, once a service enters either of these
 * states it cannot ever leave them.
 *
 * <p>Implementors of this interface are strongly encouraged to extend one of the abstract classes
 * in this package which implement this interface and make the threading and state management
 * easier.
 *

 * {@link DeadEvent} and reposted.
 *
 * <p>If a subscriber for a supertype of all events (such as Object) is registered, no event will
 * ever be considered dead, and no DeadEvents will be generated. Accordingly, while DeadEvent
 * extends {@link Object}, a subscriber registered to receive any Object will never receive a
 * DeadEvent.
 *

//tensorflow/python/kernel_tests/signal
//tensorflow/examples
//tensorflow/tools/android
//tensorflow/python/eager/benchmarks
EOF

  # grep patterns for files and targets which don't need to be in the pip
  # package, ever.
  cat > $BATS_TEST_TMPDIR/ignore_these_deps <<EOF
benchmark
_test$
_test.py$
_test_cpu$
_test_cpu.py$
_test_gpu$
_test_gpu.py$
_test_lib$
//tensorflow/cc/saved_model:saved_model_test_files

software used on network servers, this result may fail to come about.
The GNU General Public License permits making a modified version and
letting the public access it on a server without ever releasing its
source code to the public.

  The GNU Affero General Public License is designed specifically to
ensure that, in such cases, the modified source code becomes available