userPicker.moveMouseOver().sendKeys(Keys.BACK_SPACE).waitForSuggestions().waitForSuggestionsToDisappear();
// The list of suggestions should stay open if the mouse is over it.
userPicker.sendKeys(Keys.BACK_SPACE).waitForSuggestions().getSuggestions().get(0).moveMouseOver();
try {
userPicker.waitForSuggestionsToDisappear();
Assert.fail();
} catch (Exception e) {
}
// .. and the list of suggestions should fade out when the mouse is moved out.