Fix unit tests for Swift 4/Xcode 9 #41
Description
- Don't call
XCTFailin class levelsetupandteardown - Rework tests that use
symlinkInExecutableFolderas the code may not have the permissions to modify that folder
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XCTFail in class level setup and teardownsymlinkInExecutableFolder as the code may not have the permissions to modify that folder