// Mock successful but empty response
        when(treeHandle.send(any(), any(), (RequestParam[]) any())).thenAnswer(invocation -> {
            // The response is the second argument
            Object response = invocation.getArgument(1);
            // Return it unchanged (which will have default values = empty results)
            return response;
        });

   * by the argument according to three criteria:
   *
   * <ol>
   *   <li>The type of the argument is the wildcard or equal to the type of this instance.
   *   <li>The subtype of the argument is the wildcard or equal to the subtype of this instance.
   *   <li>All of the parameters present in the argument are present in this instance.
   * </ol>
   *
   * <p>For example:

        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);
        final Exception cause = new IllegalArgumentException("Invalid query argument");

        // Execute
        final InvalidQueryException exception = new InvalidQueryException(messageCode, message, cause);

        // Verify stack trace is captured

///

The only new thing is the `callbacks=invoices_callback_router.routes` as an argument to the *path operation decorator*. We'll see what that is next.

## Documenting the callback { #documenting-the-callback }

The actual callback code will depend heavily on your own API app.

     */
    public static String url(final String input) {
        if (input == null) {
            final String msg = "The argument 'input' should not be null.";
            throw new IllegalArgumentException(msg);
        }
        if (!input.startsWith("/")) {
            final String msg = "The argument 'input' should start with slash '/': " + input;
            throw new IllegalArgumentException(msg);
        }

    return (graph instanceof ImmutableValueGraph)
        ? (ImmutableValueGraph<N, V>) graph
        : new ImmutableValueGraph<N, V>(graph);
  }

  /**
   * Simply returns its argument.
   *
   * @deprecated no need to use this
   */
  @InlineMe(
      replacement = "checkNotNull(graph)",
      staticImports = "com.google.common.base.Preconditions.checkNotNull")
  @Deprecated

	for _, collectorPath := range h.metricsData.collectorPaths {
		if collectorPath.isDescendantOf(path) {
			gatherer := h.metricsData.mgGatherers[collectorPath]

			// For Bucket metrics we need to set the buckets argument inside the
			// metric group, so that it will affect collection. If no buckets
			// are provided, we will not return bucket metrics.
			if bmg, ok := h.metricsData.bucketMGMap[collectorPath]; ok {

        assertArgumentNotNull("field", field);

        set(field, null, value);
    }

    /**
     * Sets the value of the given {@link Field} representing the specified object argument's field to the specified new value.
     *
     * @param field the field (must not be {@literal null})
     * @param target the object whose field is to be modified; {@literal null} if the field is static

            labels.testAssertPropertyNotNull(null);
            fail("Should throw IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            assertEquals("The argument 'property' for message should not be null.", e.getMessage());
        }
    }

    /**
     * Test that assertPropertyNotNull does not throw exception for non-null input
     */

# Parameter Path

"parameter" atau "variabel" path didefinisikan dengan sintaksis Python format string:

{* ../../docs_src/path_params/tutorial001.py hl[6:7] *}

Nilai parameter path `item_id` akan dikirim ke fungsi sebagai argument `item_id`:

Jika anda menjalankan contoh berikut dan kunjungi <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, anda akan melihat respon:

```JSON