A/B Testing: Validating Multiple Variations

Can you spot the difference? Is there one?

When you have multiple variations of your app, how do you automate the process to validate each variation?

A/B testing is a technique used to compare multiple experimental variations of the same application to determine which one is more effective with users. You typically run A/B tests to get statistically valid measures of effectiveness. But, do you know why one version is better than the other? It could be that one contains a defect.