<rdar://problem/24814424> Add unit tests for the error handling support in the XCTest swift overlay
<rdar://problem/24814424> Add unit tests for the error handling support in the XCTest swift overlay

khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift