Once you've created and then run tests, you can view test results in two places.
From the Admin Console, you view a summary of how each submission performed on your tests by visiting the "Test Summary" page.
From the Code Console, you’ll see a new “Tests” menu above the file navigator on the left side of the window. This menu is visible to anyone who can access the submission. When clicked, you can see the results of each test (passed, failed, or error), the points associated with the test outcome, as well as any logs.