Assistant: 
User: 
    Please analyze the following code file and determine whether it belongs to any of the provided modules based on the listed module descriptions.
    Note that the provided list of modules may not be exhaustive, and some files may not belong to any of the modules. 
    If the code belongs to a module, Only output the module name, without any explanation or additional information; otherwise, return 'None' if it does not belong to any module.

    Modules : {
        "UI": "Handles the front-end user interface, consisting of HTML, CSS, and JavaScript files generated by the Angular framework. It processes user requests and interacts with the server using AJAX for data retrieval and client-side interactions."
"Test Driver": "Facilitates automated regression testing and handles transmission of test data in JSON format. It performs Java testing using TestNG and JavaScript unit-testing with Jest. It also sets up a simulated web server for servlet-level tests and automates end-to-end testing using Selenium Java."
"Logic": "Manages the business logic of TEAMMATES, including handling relationships between entities, managing transactions, input value sanitization, access control rights, and interfacing with GAE-provided or third-party APIs."
"Storage": "Performs CRUD operations on data entities, validation of data, and abstraction of GQL queries, hiding the complexities of datastore from the Logic component."
"Common": "Contains utility classes, custom exceptions, and data transfer objects used across the entire application for easy consolidation and transfer of structured data."
"E2E": "Handles end-to-end testing and load & performance testing, providing helpers, abstractions of browser pages, and test cases for E2E tests and L&P tests."
"Client": "Contains scripts for administrative tasks, such as migrating data to a new schema and calculating statistics. This module connects directly to the application back-end for administrative purposes."
    }

    Code: package teammates.logic.external; /** * SUT: {@link GoogleRecaptchaService}. */ public class GoogleRecaptchaServiceTest extends BaseTestCase { /** * Tests the overloaded {@link GoogleRecaptchaService#isVerificationSuccessful(String)} method. */ @Test public void testIsVerificationSuccessful() { ______TS("null or empty CAPTCHA response"); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful(null)); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("")); ______TS("empty CAPTCHA secret key"); assertFalse(new GoogleRecaptchaServiceStub(null).isVerificationSuccessful("empty secret key")); assertFalse(new GoogleRecaptchaServiceStub("").isVerificationSuccessful("empty secret key")); ______TS("Successful verification"); // Use RecaptchaVerifierStub to mimic success response assertTrue(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("success")); ______TS("reCAPTCHA error codes that can occur during the API request execution"); // Use RecaptchaVerifierStub to mimic error codes assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("missing recaptcha params")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("invalid recaptcha secret key")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("invalid recaptcha response")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("invalid recaptcha request")); ______TS("Exceptions that can occur during the API request execution"); // Use RecaptchaVerifierStub to mimic runtime exceptions assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("null response")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("invalid uri")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("http protocol error")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("i/o exception")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("timeout exception")); assertFalse(new GoogleRecaptchaServiceStub("testKey").isVerificationSuccessful("non 2xx http response")); } /** * A subclass to mock responses and exceptions that could result in * {@link GoogleRecaptchaService#getApiResponse(String, String)}. * Success response is also mocked to decouple from the Google server for testing purposes. This way, tests are not * affected by potential issues in the Google server (e.g. server down). * * @see <a href="https://developers.google.com/recaptcha/docs/verify#error-code-reference">reCAPTCHA API error codes</a> */ private static class GoogleRecaptchaServiceStub extends GoogleRecaptchaService { private GoogleRecaptchaServiceStub(String secretKey) { super(secretKey); } @Override @SuppressWarnings("PMD.AvoidThrowingNullPointerException") // del
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