### Question:
UserApi { public User getUserByName(String username) throws IOException { HttpResponse response = getUserByNameForHttpResponse(username); TypeReference<User> typeRef = new TypeReference<User>() {}; return apiClient.getObjectMapper().readValue(response.getContent(), typeRef); } UserApi();  UserApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); void createUser(User body); void createUser(User body, Map<String, Object> params); HttpResponse createUserForHttpResponse(User body); HttpResponse createUserForHttpResponse(java.io.InputStream body, String mediaType); HttpResponse createUserForHttpResponse(User body, Map<String, Object> params); void createUsersWithArrayInput(List<User> body); void createUsersWithArrayInput(List<User> body, Map<String, Object> params); HttpResponse createUsersWithArrayInputForHttpResponse(List<User> body); HttpResponse createUsersWithArrayInputForHttpResponse(java.io.InputStream body, String mediaType); HttpResponse createUsersWithArrayInputForHttpResponse(List<User> body, Map<String, Object> params); void createUsersWithListInput(List<User> body); void createUsersWithListInput(List<User> body, Map<String, Object> params); HttpResponse createUsersWithListInputForHttpResponse(List<User> body); HttpResponse createUsersWithListInputForHttpResponse(java.io.InputStream body, String mediaType); HttpResponse createUsersWithListInputForHttpResponse(List<User> body, Map<String, Object> params); void deleteUser(String username); void deleteUser(String username, Map<String, Object> params); HttpResponse deleteUserForHttpResponse(String username); HttpResponse deleteUserForHttpResponse(String username, Map<String, Object> params); User getUserByName(String username); User getUserByName(String username, Map<String, Object> params); HttpResponse getUserByNameForHttpResponse(String username); HttpResponse getUserByNameForHttpResponse(String username, Map<String, Object> params); String loginUser(String username, String password); String loginUser(String username, String password, Map<String, Object> params); HttpResponse loginUserForHttpResponse(String username, String password); HttpResponse loginUserForHttpResponse(String username, String password, Map<String, Object> params); void logoutUser(); void logoutUser(Map<String, Object> params); HttpResponse logoutUserForHttpResponse(); HttpResponse logoutUserForHttpResponse(Map<String, Object> params); void updateUser(String username, User body); void updateUser(String username, User body, Map<String, Object> params); HttpResponse updateUserForHttpResponse(String username, User body); HttpResponse updateUserForHttpResponse(String username, java.io.InputStream body, String mediaType); HttpResponse updateUserForHttpResponse(String username, User body, Map<String, Object> params);  }### Answer:
@Test public void getUserByNameTest() throws IOException { String username = null; User response = api.getUserByName(username); }