### Question:
PositionsApi { public Object positionsChangeMargin(String symbol, String margin) throws ApiException { ApiResponse<Object> resp = positionsChangeMarginWithHttpInfo(symbol, margin); return resp.getData(); } PositionsApi();  PositionsApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); com.squareup.okhttp.Call positionsChangeMarginCall(String symbol, String margin, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Object positionsChangeMargin(String symbol, String margin); ApiResponse<Object> positionsChangeMarginWithHttpInfo(String symbol, String margin); com.squareup.okhttp.Call positionsChangeMarginAsync(String symbol, String margin, final ApiCallback<Object> callback); com.squareup.okhttp.Call positionsMyPositionCall(final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Object positionsMyPosition(); ApiResponse<Object> positionsMyPositionWithHttpInfo(); com.squareup.okhttp.Call positionsMyPositionAsync(final ApiCallback<Object> callback); com.squareup.okhttp.Call positionsMyPositionV2Call(String symbol, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Object positionsMyPositionV2(String symbol); ApiResponse<Object> positionsMyPositionV2WithHttpInfo(String symbol); com.squareup.okhttp.Call positionsMyPositionV2Async(String symbol, final ApiCallback<Object> callback); com.squareup.okhttp.Call positionsSaveLeverageCall(String symbol, String leverage, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Object positionsSaveLeverage(String symbol, String leverage); ApiResponse<Object> positionsSaveLeverageWithHttpInfo(String symbol, String leverage); com.squareup.okhttp.Call positionsSaveLeverageAsync(String symbol, String leverage, final ApiCallback<Object> callback); com.squareup.okhttp.Call positionsTradingStopCall(String symbol, String takeProfit, String stopLoss, String trailingStop, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Object positionsTradingStop(String symbol, String takeProfit, String stopLoss, String trailingStop); ApiResponse<Object> positionsTradingStopWithHttpInfo(String symbol, String takeProfit, String stopLoss, String trailingStop); com.squareup.okhttp.Call positionsTradingStopAsync(String symbol, String takeProfit, String stopLoss, String trailingStop, final ApiCallback<Object> callback); com.squareup.okhttp.Call positionsUserLeverageCall(final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Object positionsUserLeverage(); ApiResponse<Object> positionsUserLeverageWithHttpInfo(); com.squareup.okhttp.Call positionsUserLeverageAsync(final ApiCallback<Object> callback);  }### Answer:
@Test public void positionsChangeMarginTest() throws ApiException { String symbol = null; String margin = null; Object response = api.positionsChangeMargin(symbol, margin); }