### Question:
AuthenticationHttpBasicApi { public PostAuthenticationResponse authenticate(String username, String password) throws ApiException { ApiResponse<PostAuthenticationResponse> resp = authenticateWithHttpInfo(username, password); return resp.getData(); } AuthenticationHttpBasicApi();  AuthenticationHttpBasicApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); com.squareup.okhttp.Call authenticateCall(String username, String password, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); PostAuthenticationResponse authenticate(String username, String password); ApiResponse<PostAuthenticationResponse> authenticateWithHttpInfo(String username, String password); com.squareup.okhttp.Call authenticateAsync(String username, String password, final ApiCallback<PostAuthenticationResponse> callback);  }### Answer:
@Test public void authenticateTest() throws ApiException { String username = null; String password = null; PostAuthenticationResponse response = api.authenticate(username, password); }