Over the years a test I've often used is asking "how does this person respond to being challenged/questioned?" A great leader tends to embrace the fact that someone is asking "why" and uses it as an opportunity to learn and potentially convert the questioning party (if they're questioning something in the first place, then you haven't nailed it 100%). A weak leader who doesn't have confidence in their abilities sees the challenge as a personal attack and reacts in a knee-jerk fashion (often, though not always, resulting in a termination). If you can't reconcile differing opinions and convert those with opposing views to you then you're doomed as a leader and odds are your company/team will experience high turnover.
Obviously there's a whole range of other traits that make great leaders, but I've found people that fail this test are almost always terrible leaders who others don't want to work for.
Obviously there's a whole range of other traits that make great leaders, but I've found people that fail this test are almost always terrible leaders who others don't want to work for.