public RequestSpecBuilder addParam(String parameterName, Collection<?> parameterValues) {
        spec.param(parameterName, parameterValues);
        return this;
    }
public RequestSpecBuilder addParam(String parameterName, Collection<?> parameterValues) {
        spec.param(parameterName, parameterValues);
        return this;
    }
public RequestSpecBuilder addParam ( String parameterName , Collection < ? > parameterValues ) { spec . param ( parameterName , parameterValues ) ; return this ; }
Add a multi-value parameter to be sent with the request.

@param parameterName   The parameter key
@param parameterValues The parameter values
@return The request specification builder
Add a multi - value parameter to be sent with the request .