### Question:
OAuth2HandlerModule extends AbstractModule { @Provides @Singleton public static List<ClientAuthenticationHandler> provideClientAuthenticationHandlers( final BasicAuthenticationHandler basicAuthenticationHandler, final StandardAuthenticationHandler standardAuthenticationHandler) { return ImmutableList.of(basicAuthenticationHandler, standardAuthenticationHandler); }  @Provides @Singleton static List<AuthorizationEndpointResponseHandler> provideAuthorizationEndpointResponseHandlers(
          final CodeAuthorizationResponseHandler codeAuthorizationResponseHandler); @Provides @Singleton static List<ClientAuthenticationHandler> provideClientAuthenticationHandlers(
          final BasicAuthenticationHandler basicAuthenticationHandler,
          final StandardAuthenticationHandler standardAuthenticationHandler); @Provides @Singleton static List<GrantRequestHandler> provideGrantRequestHandlers(
          final ClientCredentialsGrantTypeHandler clientCredentialsGrantTypeHandler,
          final CodeGrantTypeHandler codeGrantTypeHandler); @Provides @Singleton static List<TokenEndpointResponseHandler> provideTokenEndpointResponseHandlers(
          final TokenAuthorizationResponseHandler tokenAuthorizationResponseHandler); @Provides @Singleton static List<ResourceRequestHandler> provideTokenHandlers(
          final BearerTokenHandler bearerTokenHandler, final MacTokenHandler macTokenHandler);  }### Answer:
@SuppressWarnings("unused") @Test public void testProvideClientAuthenticationHandlers_1() throws Exception { final OAuth2HandlerModule fixture = new OAuth2HandlerModule(); final BasicAuthenticationHandler basicAuthenticationHandler = new BasicAuthenticationHandler(); final StandardAuthenticationHandler standardAuthenticationHandler = new StandardAuthenticationHandler(); final List<ClientAuthenticationHandler> result = OAuth2HandlerModule .provideClientAuthenticationHandlers(basicAuthenticationHandler, standardAuthenticationHandler); Assert.assertNotNull(result); Assert.assertEquals(2, result.size()); }