Thanks! Yep tests are versioned - if you click on the 'History' button when viewing a test you'll see all the executions within your retention period. We don't show a diff view of historical changes, however we do show a diff view when a text change causes your test to fail. So say if your 'Log In' button changed to 'Sign In', we would show you a diff of that text change and give you an option to make 'Sign In' the new baseline used when running future tests.