Description:
Removing the timeout from the teardown in __init.test.js speeds up test execution significantly on my machine. According to the accompanying comment this timeout is there to let detachCallbacks clean themselves up before considering the teardown complete. However, custom elements v1 uses disconnectedCallback which is (effectively) synchronous, and therefore the setTimeout should have no bearing on them.

Removing the timeout doesn't seem to have a negative impact. All tests are still green after making this change.

Changes proposed:

• Make teardown synchronous in __init.test.js speeding up tests