assertEquals("childuser", testConfig.getDefaultUsername()); // Overridden
        assertEquals("parentdomain", testConfig.getDefaultDomain()); // Inherited
    }

    @Test
    @DisplayName("Should validate configuration consistency")
    void testConfigurationValidation() throws CIFSException {
        // Given
        Properties props = new Properties();
        props.setProperty("jcifs.smb.client.minVersion", "SMB311");

			if errCode != testCase.expected {
				t.Errorf("(%d) expected to get success, instead got %s", i, niceError(errCode))
			}
		}
	}
}

// TestValidateV2AuthHeader - Tests validate the logic of V2 Authorization header validator.
func TestValidateV2AuthHeader(t *testing.T) {
	ctx, cancel := context.WithCancel(t.Context())
	defer cancel()

	obj, fsDir, err := prepareFS(ctx)
	if err != nil {

import org.junit.jupiter.api.Timeout;
import org.mockito.Mockito;

import jcifs.CIFSContext;
import jcifs.Configuration;
import jcifs.Credentials;

/**
 * Simple memory management tests to validate basic resource cleanup functionality
 */
public class SimpleMemoryManagementTest {

    private CIFSContext mockContext;
    private SmbTransportImpl mockTransport;
    private Configuration mockConfig;

import jcifs.SmbTree;
import jcifs.internal.CommonServerMessageBlockResponse;
import jcifs.internal.Request;

/**
 * Tests for SmbTreeInternal interface behavior via mocks.
 * Since this is an interface, we validate its public API contract
 * through interaction testing and generic type usage.
 */
@ExtendWith(MockitoExtension.class)
class SmbTreeInternalTest {

    @Mock
    private SmbTreeInternal tree;

    @Mock

        Address address = nameServiceClient.getByName("localhost", false);

        // Then
        assertNotNull(address, "Should return address for localhost");
    }

    @Test
    @DisplayName("Should validate context configuration access")
    void testContextAccess() {
        // When
        NameServiceClientImpl client = new NameServiceClientImpl(mockContext);

        // Then

```

</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 }

        // Act & Assert: attempting to call any method on null should throw NPE
        Assertions.assertThrows(NullPointerException.class, () -> {
            // Intentionally dereference null to validate exception behavior
            // This checks that callers must handle null references defensively
            info.getSize();
        });
    }

	// Adds 'crossdomain.xml' policy middleware to serve legacy flash clients.
	setCrossDomainPolicyMiddleware,
	// Limits all body and header sizes to a maximum fixed limit
	setRequestLimitMiddleware,
	// Validate all the incoming requests.
	setRequestValidityMiddleware,
	// Add upload forwarding middleware for site replication
	setUploadForwardingMiddleware,
	// Add bucket forwarding middleware
	setBucketForwardingMiddleware,

	// request and proceed further. This is a work-around to address
	// an important problem for ListBuckets() getting signed with
	// different regions.
	if region == "" {
		region = sRegion
	}
	// Should validate region, only if region is set.
	if !isValidRegion(sRegion, region) {
		return ch, ErrAuthorizationHeaderMalformed
	}
	if credElements[2] != string(stype) {
		if stype == serviceSTS {

	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}
	region := globalSite.Region()
	config.SetRegion(region)
	if err = config.Validate(region, globalEventNotifier.targetList); err != nil {
		arnErr, ok := err.(*event.ErrARNNotFound)
		if ok {
			for i, queue := range config.QueueList {
				// Remove ARN not found queues, because we previously allowed