### Question:
UserApi { public void updateUser(String username, User user) throws ApiException { updateUserWithHttpInfo(username, user); } UserApi();  UserApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); void createUser(User user); ApiResponse<Void> createUserWithHttpInfo(User user); void createUsersWithArrayInput(List<User> user); ApiResponse<Void> createUsersWithArrayInputWithHttpInfo(List<User> user); void createUsersWithListInput(List<User> user); ApiResponse<Void> createUsersWithListInputWithHttpInfo(List<User> user); void deleteUser(String username); ApiResponse<Void> deleteUserWithHttpInfo(String username); User getUserByName(String username); ApiResponse<User> getUserByNameWithHttpInfo(String username); String loginUser(String username, String password); ApiResponse<String> loginUserWithHttpInfo(String username, String password); void logoutUser(); ApiResponse<Void> logoutUserWithHttpInfo(); void updateUser(String username, User user); ApiResponse<Void> updateUserWithHttpInfo(String username, User user);  }### Answer:
@Test public void updateUserTest() throws ApiException { }