Each test you run is logged in your history and accessible at any time. Simply click the activity icon on any test to access the history for this test then click View Report on the date and time you want to view.
Your test report will indicate if the test passed or failed, along with the time it was run and the time taken to execute.
You can also view the test log which contains the result of each metric in your test. If there was any output in the browser console, it will also be available here.