│   ├── __init__.py
│   ├── main.py
│   └── test_main.py
```

Let's say that now the file `main.py` with your **FastAPI** app has some other **path operations**.

It has a `GET` operation that could return an error.

It has a `POST` operation that could return several errors.

Both *path operations* require an `X-Token` header.

{* ../../docs_src/app_testing/app_b_an_py310/main.py *}

    @UriType(protocolType = ProtocolType.FILE)
    private String testFieldFile;

    // Test field with custom message
    @UriType(protocolType = ProtocolType.WEB, message = "Custom URI validation error")
    private String testFieldWithMessage;

    // Test field with groups
    @UriType(protocolType = ProtocolType.WEB, groups = { TestGroup.class })
    private String testFieldWithGroups;

      val partSource = PartSource()
      currentPart = partSource
      return Part(headers, partSource.buffer())
    }

    /** A single part in the stream. It is an error to read this after calling [nextPart]. */
    private inner class PartSource : Source {
      private val timeout = Timeout()

      override fun close() {
        if (currentPart == this) {

 *   <li>comparing each pair of objects from different equality groups returns false
 *   <li>the hash codes of any two equal objects are equal
 * </ul>
 *
 * <p>When a test fails, the error message labels the objects involved in the failed comparison as
 * follows:
 *
 * <ul>
 *   <li>"{@code [group }<i>i</i>{@code , item }<i>j</i>{@code ]}" refers to the

     *
     * @return an {@link Optional} containing the boolean flag, or empty if not set
     */
    @Nonnull
    Optional<Boolean> verbose();

    /**
     * Indicates whether to show error stack traces.
     *
     * @return an {@link Optional} containing the boolean flag, or empty if not set
     */
    @Nonnull
    Optional<Boolean> showErrors();

    /**

Ainsi, en utilisant `secrets.compare_digest()` dans le code de votre application, votre application sera protégée contre toute cette gamme d'attaques de sécurité.

### Renvoyer l'erreur { #return-the-error }

			mw := msgp.NewWriter(w)
			n, err := mw.Write(data[:])
			if err != nil {
				w.CloseWithError(err)
				return
			}
			if n != len(data) {
				w.CloseWithError(io.ErrShortWrite)
				return
			}
			for item := range m.opCh {
				err = item.EncodeMsg(mw)
				if err != nil {
					break
				}
			}
			mw.Flush()
			w.CloseWithError(err)
		}()
		return r
	}

        }
    }

    @Test
    public void test_patternCompilationIsValid() {
        // Ensure all patterns compile without error
        assertNotNull(Pattern.compile(WEB_FILE_RULE_PATTERN));
        assertNotNull(Pattern.compile(FS_FILE_RULE_PATTERN));
        assertNotNull(Pattern.compile(WEB_HTML_RULE_PATTERN));
    }

    }

    @Test
    public void test_specialCharactersInMessage() {
        // Test with special characters in message
        String messageWithSpecialChars = "Error: offset > 1000 && offset < 2000 | \"quotes\" 'single' \n\t tab";
        ResultOffsetExceededException exception = new ResultOffsetExceededException(messageWithSpecialChars);

   * result.
   *
   * @return the next element if there was one. If {@code endOfData} was called during execution,
   *     the return value will be ignored.
   * @throws RuntimeException if any unrecoverable error happens. This exception will propagate
   *     outward to the {@code hasNext()}, {@code next()}, or {@code peek()} invocation that invoked
   *     this method. Any further attempts to use the iterator will result in an {@link