Fix focus and blur tests for CheckBoxGroup, NativeSelect and RatioButtonGroup

Change-Id: I8454ef0895708eaee0bb2771b28c0a0db2fc76a4

uitest/src/test/java/com/vaadin/tests/components/checkboxgroup/CheckBoxGroupFocusBlurTest.java

         // click on the second checkbox doesn't fire anything
         Assert.assertFalse(logContainsText("2."));
 
-        // click in the middle between the first and the second (inside group).
-        WebElement first = checkBoxes.get(0);
-        int middle = (first.getLocation().y + first.getSize().height
-                + checkBoxes.get(1).getLocation().y) / 2;
-        new Actions(getDriver()).moveByOffset(first.getLocation().x, middle)
+        // move the cursor to the middle of the first element,
+        // offset to the middle of the two and perform click
+        new Actions(getDriver()).moveToElement(checkBoxes.get(0))
+                .moveByOffset(0,
+                        (checkBoxes.get(1).getLocation().y
+                                - checkBoxes.get(0).getLocation().y) / 2)
                 .click().build().perform();
+
         // no new events
         Assert.assertFalse(logContainsText("2."));
 

uitest/src/test/java/com/vaadin/tests/components/nativeselect/NativeSelectFocusBlurTest.java

         // Focus event is fired
         Assert.assertTrue(logContainsText("3. Focus Event"));
 
-        options.get(1).sendKeys(Keys.ARROW_UP, Keys.ENTER);
+        nativeSelect.sendKeys(Keys.ARROW_UP, Keys.ENTER);
         // No any new event
         Assert.assertFalse(logContainsText("4."));
     }

uitest/src/test/java/com/vaadin/tests/components/radiobuttongroup/RadioButtonGroupFocusBlurTest.java

         // click on the second radio button doesn't fire anything
         Assert.assertFalse(logContainsText("2."));
 
-        // click in the middle between the first and the second (inside group).
-        WebElement first = radioButtons.get(0);
-        int middle = (first.getLocation().y + first.getSize().height
-                + radioButtons.get(1).getLocation().y) / 2;
-        new Actions(getDriver()).moveByOffset(first.getLocation().x, middle)
+        // move the cursor to the middle of the first element,
+        // offset to the middle of the two and perform click
+        new Actions(getDriver()).moveToElement(radioButtons.get(0))
+                .moveByOffset(0,
+                        (radioButtons.get(1).getLocation().y
+                                - radioButtons.get(0).getLocation().y) / 2)
                 .click().build().perform();
         // no new events
         Assert.assertFalse(logContainsText("2."));