Better isolating `Extract` command test.
Better isolating `Extract` command test.

This prevents the test to fail or hang when the g11n bootstrap is
loaded.

davidpersson/lithium,graphis/lithium,wbeater/lithium,datachand/lithium,graphis/lithium,jails/lithium,muyehub/lithium,datachand/lithium,UnionOfRAD/lithium,muyehub/lithium,davidpersson/lithium,jails/lithium,SensCritique/lithium,UnionOfRAD/lithium,SensCritique/lithium,qoqa/lithium,wbeater/lithium,qoqa/lithium,mehlah/lithium,whowgames/lithium,whowgames/lithium,mehlah/lithium,pixelcog/lithium,m4rcsch/lithium-core-library,pixelcog/lithium,m4rcsch/lithium-core-library