Fix flaky test #388

Job	Run time
Node Tests	1m 23s
Floating Dependencies	2m 52s
Docs	1m 23s
Tests	3m 29s
Coverage Report (default)	3m 16s
Coverage Report (plain-html)	4m 10s
ember-lts-4.4, Chrome	4m 31s
Coverage Report (bs4)	5m 2s
ember-lts-4.8, Chrome	4m 39s
Coverage Report (bs5)	4m 49s
ember-lts-4.12, Chrome	4m 30s
ember-release, Chrome	4m 33s
ember-beta, Chrome	4m 38s
ember-canary, Chrome	4m 37s
ember-lts-4.4-with-plain-html, Chrome	4m 45s
ember-lts-4.8-with-plain-html, Chrome	4m 36s
ember-lts-4.12-with-plain-html, Chrome	4m 29s
ember-beta-with-plain-html, Chrome	4m 31s
ember-lts-4.4-with-ember-bootstrap-v4, Chrome	5m 4s
ember-lts-4.8-with-ember-bootstrap-v4, Chrome	4m 48s
ember-lts-4.12-with-ember-bootstrap-v4, Chrome	4m 47s
ember-beta-with-ember-bootstrap-v4, Chrome	4m 54s
ember-lts-4.4-with-ember-bootstrap-v5, Chrome	4m 50s
ember-lts-4.8-with-ember-bootstrap-v5, Chrome	4m 47s
ember-lts-4.12-with-ember-bootstrap-v5, Chrome	5m 6s
ember-beta-with-ember-bootstrap-v5, Chrome	4m 54s
embroider-safe, Chrome	4m 19s
embroider-optimized, Chrome	4m 25s
ember-release, Firefox	4m 47s
ember-default-with-ember-bootstrap-v4, Firefox	5m 26s
ember-default-with-ember-bootstrap-v5, Firefox	5m 15s
ember-default-with-plain-html, Firefox	4m 23s
Send Coverage Report	1m 25s
	2h 21m 23s

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