Fix `FlowShellTest` #2156

Job	Run time
Build apps (Foss, Debug, app)	5m 30s
Lint vitals (Foss, Beta, app)	5m 46s
Build apps (Gplay, Debug, app)	5m 43s
Unit tests (Debug, test)	3m 21s
Lint vitals (Foss, Release, app)	6m 13s
Unit tests (Debug, testFoss)	6m 6s
Lint vitals (Gplay, Beta, app)	5m 57s
Unit tests (Debug, testGplay)	5m 55s
Unit tests (Beta, test)	3m 33s
Lint vitals (Gplay, Release, app)	5m 58s
Unit tests (Beta, testFoss)	5m 45s
Unit tests (Beta, testGplay)	5m 41s
Unit tests (Release, test)	3m 46s
Unit tests (Release, testFoss)	6m 3s
Unit tests (Release, testGplay)	5m 38s
	1h 20m 55s

Provide feedback