Selenium moveByOffset doesn't do anything

Question

I'm running latest selenium 2.41 with Firefox 28.0 on Linux Xubuntu 13.10

I'm trying to get FirefoxDriver to move the mouse over the page (in my test, I've used the wired webpage, that has a lot of hover-activated menus), but the moveByOffset is not doing anything noticeable to the mouse, at all:

package org.openqa.mytest;

import java.util.List;
import java.io.File;
import java.lang.*;

import org.openqa.selenium.By;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.*;
import org.openqa.selenium.firefox.*;
import org.openqa.selenium.firefox.FirefoxDriver;

import org.openqa.selenium.interactions.*;

import org.apache.commons.io.FileUtils;

public class Example {
    public static void main(String[] args) throws Exception {
        // The Firefox driver supports javascript 
    FirefoxProfile profile = new FirefoxProfile();
    profile.setEnableNativeEvents(true);
        WebDriver driver = new FirefoxDriver(profile);

        // Go to the Google Suggest home page
        driver.get("http://www.wired.com");

    File scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
        // now save the screenshto to a file some place
        FileUtils.copyFile(scrFile, new File("./screenshot.png"));


    Actions builder = new Actions(driver);
    Action moveM = builder.moveByOffset(40, 40).build();
    moveM.perform();

    Action click = builder.click().build();
    click.perform();
    //click.release();

    Action moveM2 = builder.moveByOffset(50, 50).build();
    moveM2.perform();

    Action click2 = builder.click().build();
    click2.perform();
    //click2.release();

    Action moveM3 = builder.moveByOffset(150, 540).build();
    moveM3.perform();

    for( int i=0; i < 1000; i++)
    {
        moveM = builder.moveByOffset(200, 200).build();
        moveM.perform();
        Thread.sleep(500);
        moveM = builder.moveByOffset(-200, -200).build();
        moveM.perform();
        Thread.sleep(500);
    }
    //Action click3 = builder.click().build();
    //click3.perform();
    //click3.release();

    scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
        // now save the screenshto to a file some place
        FileUtils.copyFile(scrFile, new File("./screenshot2.png"));

        driver.quit();
    }
}

I'm expecting the mouse the move over the different elements and trigger all the hover actions, but nothing is happening

Answer 1

The method moveByOffset of class Actions is or has been broken. See Selenium WebDriver Bug 3578

(The error is described some lines more down in this bug document).

A project member (barancev) claims that this error should have been fixed with Selenium version 2.42.

Nevertheless I found the same error in version 2.44 running on openSUSE 12.3 with Firefox 33.0. moveToElement works, moveToOffset doesn't.