//                                                                           =========
    private static final FileConfigDbm _instance = new FileConfigDbm();

    private FileConfigDbm() {
    }

    public static FileConfigDbm getInstance() {
        return _instance;
    }

    // ===================================================================================

 * AbstractMapBasedMultimap} calls {@link #createCollection()} to create the collection of values
 * for that key. The subclass should not call {@link #createCollection()} directly, and a new
 * instance should be created every time the method is called.
 *
 * <p>For example, the subclass could pass a {@link java.util.TreeMap} during construction, and

    @DisplayName("TestLocking can be instantiated")
    void testInstantiation() {
        TestLocking t = new TestLocking();
        assertNotNull(t, "TestLocking instance should not be null");
    }

    @Test
    @DisplayName("Field values are independent across instances")
    void testIndependentInstances() {
        TestLocking t1 = new TestLocking();
        TestLocking t2 = new TestLocking();

            return updateEntity(source, result);
        } catch (InstantiationException | IllegalAccessException e) {
            final String msg = "Cannot create a new instance: " + entityType.getName();
            throw new IllegalBehaviorStateException(msg, e);
        }
    }

    protected <RESULT extends ScheduledJob> RESULT updateEntity(Map<String, Object> source, RESULT result) {

Por ejemplo, como en el modelo `Image` tenemos un campo `url`, podemos declararlo como una instance de `HttpUrl` de Pydantic en lugar de un `str`:

{* ../../docs_src/body_nested_models/tutorial005_py310.py hl[2,8] *}

El string será verificado para ser una URL válida, y documentado en JSON Schema / OpenAPI como tal.

            "No mapping between account names and security IDs was done.", "The security ID structure is invalid.",
            "The file system is full.", "All pipe instances are busy.", "All pipe instances are busy.", "The pipe state is invalid.",
            "All pipe instances are busy.", "No process is on the other end of the pipe.", "The pipe is being closed.",

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

        // Verify getMessageCode returns the same instance
        final VaMessenger<FessMessages> retrievedCode1 = exception.getMessageCode();
        final VaMessenger<FessMessages> retrievedCode2 = exception.getMessageCode();

        assertNotNull(retrievedCode1);

        // Test that the SimpleImpl class can be instantiated
        FessEnv.SimpleImpl newInstance = new FessEnv.SimpleImpl();
        assertNotNull(newInstance);

        // Verify default values work for new instance
        assertEquals("warm", newInstance.getLastaDiSmartDeployMode());
    }

    // Test edge cases for mail configuration
    public void xtest_mailConfiguration_edgeCases() {

    private Map<String, DfsReferralDataInternal> map;
    private String key;
    private String domain;

    private boolean intermediate;

    /**
     * Constructs a new DfsReferralDataImpl instance
     */
    public DfsReferralDataImpl() {
        this.next = this;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.DfsReferralData#unwrap(java.lang.Class)
     */

        if (log.isTraceEnabled()) {
            log.trace("macSigningKey:");
            log.trace(Hexdump.toHexString(macSigningKey, 0, macSigningKey.length));
        }
    }

    /**
     * This constructor used to instance a SigningDigest object for
     * signing/verifying SMB using kerberos session key.
     * The MAC Key = concat(Session Key, Digest of Challenge);
     * Because of Kerberos Authentication don't have challenge,