Fix test property lifecycle scope by @Evangelink in #10080 (backport to rel/4.3) - #10110

Fix test property lifecycle scope by @Evangelink in #10080 (backport to rel/4.3)#10110

Amaury Levé (Evangelink) merged 2 commits into

microsoft:rel/4.3microsoft/testfx:rel/4.3from

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