Blocking tests in suites (skip the rest when a prerequisite fails)

- Test 1

- Test 2

- Test 3

---- Test 3a

---- Test 3b

---- Test 3c

- Test 4

- Test 5

Each runs sequentially. If Test 3 failed, then the children 3a-3b-3c would not bother running, and the next run would be Test 4

Playwright's nearest equivalent is test.describe.serial()