```

</div>

Then go to the `/docs` UI, you will see that **FastAPI** is using these **models** to **document** the API, and it will use them to **serialize** and **validate** the data too.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Update the App with Multiple Models { #update-the-app-with-multiple-models }

        @Test
        @DisplayName("Should throw exception for buffer underrun")
        void testReadBytesWireFormatWithBufferUnderrun() {
            // Given
            byte[] buffer = new byte[59]; // One byte too small
            SMBUtil.writeInt2(60, buffer, 0);

            // When & Then
            assertThrows(ArrayIndexOutOfBoundsException.class, () -> {
                response.readBytesWireFormat(buffer, 0);

		HTTPStatusCode: http.StatusPreconditionFailed,
	},
	ErrRequestTimeTooSkewed: {
		Code:           "RequestTimeTooSkewed",
		Description:    "The difference between the request time and the server's time is too large.",
		HTTPStatusCode: http.StatusForbidden,
	},
	ErrSignatureDoesNotMatch: {
		Code:           "SignatureDoesNotMatch",

     * on what they know about the particular Joiner instances the calls are performed on.
     *
     * (In addition to useForNull, we also offer skipNulls. It, too, tolerates null inputs, but its
     * tolerance is implemented differently: Its implementation avoids calling this toString(Object)
     * method in the first place.)
     */
    requireNonNull(part);

 * }
 *
 * <h3>Comparison to alternatives</h3>
 *
 * <p><b>Note:</b> In some cases the differences explained below can be subtle. When it's unclear
 * which approach to use, <b>don't worry</b> too much about it; just pick something that seems
 * reasonable and it will be fine.
 *
 * <ul>
 *   <li>If checking whether the <i>caller</i> has violated your method or constructor's contract

            throws XmlPullParserException, IOException {
        // strictXmlAttributes = true for model: if strict == true, not only elements are checked but attributes too
        if (strict) {
            throw new XmlPullParserException(
                    "Unknown attribute '" + attribute + "' for tag '" + tagName + "'", parser, null);
        }

                service_unavailable: 'The AI service is temporarily unavailable. Please try again later.',
                timeout: 'The request timed out. Please try again.',
                context_length_exceeded: 'The message is too long to process. Please shorten it and try again.',
                model_not_found: 'The AI model was not found. Please contact the administrator.',

      try {
        val parsed = s.toLong()
        return if (parsed <= 0L) Long.MIN_VALUE else parsed
      } catch (e: NumberFormatException) {
        // Check if the value is an integer (positive or negative) that's too big for a long.
        if (s.matches("-?\\d+".toRegex())) {
          return if (s.startsWith("-")) Long.MIN_VALUE else Long.MAX_VALUE
        }
        throw e
      }
    }

    /**

			objectName:     "foxdir/fooobject/foo.txt",
			objectModTime:  time.Now().UTC().Add(-10 * 24 * time.Hour), // Created 10 days ago
			expectedAction: DeleteAction,
		},
		// Too early to remove (test Days)
		{
			inputConfig:    `<LifecycleConfiguration><Rule><Filter><Prefix>foodir/</Prefix></Filter><Status>Enabled</Status><Expiration><Days>5</Days></Expiration></Rule></LifecycleConfiguration>`,

import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/** Unit tests for CacheBuilder. */
@GwtCompatible
// We are intentionally testing the TimeUnit overloads, too.
@SuppressWarnings("LongTimeUnit_ExpireAfterWrite_Seconds")
@NullUnmarked
public class CacheBuilderTest extends TestCase {

  public void testNewBuilder() {
    CacheLoader<Object, Integer> loader = constantLoader(1);