t.Fatalf("loaded should be false")
	}

	if loaded = loadOrStoreVisitMap(&vm, reflect.ValueOf(&t1)); !loaded {
		t.Fatalf("loaded should be true")
	}

	// t1 already exist but t2 not
	if loaded = loadOrStoreVisitMap(&vm, reflect.ValueOf([]*testM{&t1, &t2, &t3})); loaded {
		t.Fatalf("loaded should be false")
	}

	if loaded = loadOrStoreVisitMap(&vm, reflect.ValueOf([]*testM{&t2, &t3})); !loaded {

  Entry<K, V> belowSamplesLesser();

  /**
   * Returns an entry with a key less than the keys of the {@link #samples()} but greater than the
   * key of {@link #belowSamplesLesser()}.
   */
  Entry<K, V> belowSamplesGreater();

  /**
   * Returns an entry with a key greater than the keys of the {@link #samples()} but less than the
   * key of {@link #aboveSamplesGreater()}.
   */
  Entry<K, V> aboveSamplesLesser();

  /**

              <!-- FeatureUtilTest.*ExampleDerivedInterfaceTester, com.google.common.io.*Tester, incidentally FeatureSpecificTestSuiteBuilderTest.MyAbstractTester (but we don't care either way because it's not meant to run on its own but works OK if it does)... but not NullPointerTesterTest, etc. -->
              <exclude>%regex[.*Tester.class]</exclude>
              <!-- Anonymous TestCase subclasses in GeneratedMonitorTest -->

     *
     * @throws IOException if an I/O error occurs
     */
    @Test
    void testConstructorWithMissingApplicationTag() throws IOException {
        // Create inner content with OID and magic bytes but wrong tag after
        ByteArrayOutputStream innerContent = new ByteArrayOutputStream();
        ASN1ObjectIdentifier kerberosOid = new ASN1ObjectIdentifier(KerberosConstants.KERBEROS_OID);

# Using Dataclasses { #using-dataclasses }

FastAPI is built on top of **Pydantic**, and I have been showing you how to use Pydantic models to declare requests and responses.

But FastAPI also supports using <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> the same way:

{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}

    assertSame(e, urlFormParameterEscaper());
    assertBasicUrlEscaper(e);

    /*
     * Specified as safe by RFC 2396 but not by java.net.URLEncoder. These tests will start failing
     * when the escaper is made compliant with RFC 2396, but that's a good thing (just change them
     * to assertUnescaped).
     */
    assertEscaping(e, "%21", '!');
    assertEscaping(e, "%28", '(');

    Path topDirectory();

    /**
     * Returns the root directory of the Maven invocation, if found. This is determined by the presence of a
     * {@code .mvn} directory or a POM with the root="true" property but is not always applicable (ie invocation
     * from outside a checkout).
     *
     * @return the root directory path, if present
     */
    @Nonnull
    Optional<Path> rootDirectory();

    /**

		closeBitrotWriters(writers)
		if err != nil && !test.shouldFail {
			t.Errorf("Test %d: should pass but failed with: %v", i, err)
		}
		if err == nil && test.shouldFail {
			t.Errorf("Test %d: should fail but it passed", i)
		}
		for i, w := range writers {
			if w == nil {
				disks[i] = OfflineDisk
			}
		}
		if err == nil {

 *       typically because the type forbids nullable type arguments: For example, {@code
 *       ImmutableList.get} returns {@code E}, but that value is never {@code null}. (Accordingly,
 *       {@code ImmutableList} is declared to forbid {@code ImmutableList<@Nullable String>}.)
 *   <li>methods whose return type is a type variable but which can return {@code null} regardless

 *       typically because the type forbids nullable type arguments: For example, {@code
 *       ImmutableList.get} returns {@code E}, but that value is never {@code null}. (Accordingly,
 *       {@code ImmutableList} is declared to forbid {@code ImmutableList<@Nullable String>}.)
 *   <li>methods whose return type is a type variable but which can return {@code null} regardless