SsoAuthenticator[] authenticators = ssoManager.getAuthenticators();
        assertEquals(3, authenticators.length);
        assertEquals(authenticator1, authenticators[0]);
        assertEquals(authenticator2, authenticators[1]);
        assertEquals(authenticator3, authenticators[2]);
    }

    public void test_getAuthenticators_withNoRegisteredAuthenticators() {
        SsoAuthenticator[] authenticators = ssoManager.getAuthenticators();

    /**
     * Gets all registered SSO authenticators.
     *
     * @return Array of all registered SSO authenticators
     */
    public SsoAuthenticator[] getAuthenticators() {
        return authenticatorList.toArray(new SsoAuthenticator[authenticatorList.size()]);
    }

    /**
     * Registers an SSO authenticator with this manager.
     *
     * @param authenticator The SSO authenticator to register
     */

 */
public class NtlmPasswordAuthenticatorSecurityTest {

    private NtlmPasswordAuthenticator authenticator;

    @BeforeEach
    public void setUp() {
        authenticator = null;
    }

    @AfterEach
    public void tearDown() throws Exception {
        if (authenticator != null) {
            authenticator.close();
        }
    }

    @Test
    @DisplayName("Test password stored as char array")

        char[] diffAtMiddle = "supersecretpXssword123456789".toCharArray();
        char[] diffAtEnd = "supersecretpassword12345678X".toCharArray();

        // Create authenticators
        NtlmPasswordAuthenticator baseAuth = new NtlmPasswordAuthenticator("domain", "user", new String(basePassword));

    /**
     * Resolves login credentials using various authentication methods.
     * This method handles local user authentication, LDAP authentication,
     * and SSO authentication through configured authenticators.
     *
     * @param resolver the credential resolver to use
     */
    @Override
    protected void resolveCredential(final CredentialResolver resolver) {

    }

    /**
     * Test that closed authenticator prevents all sensitive operations
     */
    @Test
    @DisplayName("Test closed authenticator blocks all sensitive operations")
    public void testClosedAuthenticatorBlocking() throws Exception {
        NtlmPasswordAuthenticator auth = new NtlmPasswordAuthenticator("DOMAIN", "user", "BlockedPass123!");

        // Close the authenticator
        auth.close();

_2018-11-16_

 *  **OkHttp now supports TLS 1.3.** This requires either Conscrypt or Java 11+.

 *  **Proxy authenticators are now asked for preemptive authentication.** OkHttp will now request
    authentication credentials before creating TLS tunnels through HTTP proxies (HTTP `CONNECT`).
    Authenticators should identify preemptive authentications by the presence of a challenge whose
    scheme is "OkHttp-Preemptive".

- Structured Authentication Configuration now supports configuring multiple JWT authenticators. The maximum allowed JWT authenticators in the authentication configuration is 64. ([#123431](https://github.com/kubernetes/kubernetes/pull/123431), [@aramase](https://github.com/aramase))

  companion object {
    /** An authenticator that knows no credentials and makes no attempt to authenticate. */
    @JvmField
    val NONE: Authenticator = AuthenticatorNone()

    private class AuthenticatorNone : Authenticator {
      override fun authenticate(
        route: Route?,
        response: Response,
      ): Request? = null
    }

- Introduced a new metric `kubelet_admission_rejections_total` to track the number of pods rejected during admission. ([#128556](https://github.com/kubernetes/kubernetes/pull/128556), [@AnishShah](https://github.com/AnishShah))