Step one: open second tab:
Step two: run test:
In a successful test the test status will immediately change to "test successful". (If you switch to the child tab yourself and that makes the test claim to be successful, that's actually an invalid test because you're letting the child tab become the active tab).
Test status: {{testStatus}}
After the test has run successfully you can close the child tab.
This is the child.
Switch back to the first tab and run the test.