| PASS length and item | |
| PASS insertRule before imports | |
| PASS insertRule after imports | |
| PASS insert other rules to pre-import layer statements fails | |
| PASS insert other rules before the first layer statement without imports | |
| PASS deleteRule before imports | |
| PASS deleteRule after imports | |
| FAIL replaceSync clears stale layer statements promise_test: Unhandled rejection with value: object "TypeError: Illegal constructor" | |