Update TestApp

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 9.75610% with 74 lines in your changes missing coverage. Please review.

Project coverage is 21.12%. Comparing base (04d021a) to head (c968838).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenSwiftUICore/Test/TestApp.swift	15.00%	34 Missing ⚠️
Sources/OpenSwiftUI/Test/TestApp.swift	0.00%	15 Missing ⚠️
...urces/OpenSwiftUICore/Util/EnvironmentHelper.swift	0.00%	8 Missing ⚠️
Sources/OpenSwiftUICore/Test/Benchmark.swift	0.00%	7 Missing ⚠️
Sources/OpenSwiftUICore/Test/Test.swift	22.22%	7 Missing ⚠️
Sources/OpenSwiftUICore/Test/TestHost.swift	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
- Coverage   21.16%   21.12%   -0.05%     
==========================================
  Files         309      310       +1     
  Lines       13256    13321      +65     
==========================================
+ Hits         2806     2814       +8     
- Misses      10450    10507      +57     

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