chris constantinescu 8c968941f9 UBT TestMode that allows building a test executable for an associated target. ...

- Each module can now have a Tests folder at its root containing low level tests written with Catch2
- Used like this: UnrealBuildTool.exe -Mode=Test TargetName Platform Configuration
- It creates a test executable that's associated with the specified build Target and it includes all the tests for the Target AND all its dependencies as well
- When building without -Mode=Test it will omit the Tests folder contents from compilation: in theory we never allowed folders named Tests at the root of modules, but there might be isolated exceptions where we didn't validate folder names - in this case we will need to move that Tests folder one level up for example
- Code paths for test and non-test builds are entirely separated

#jira UE-135280
#rb Jerome.Delattre
#preflight 61e839d5276892ce10759205

[CL 18663474 by chris constantinescu in ue5-main branch]

2022-01-19 15:00:37 -05:00

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