[PackageBuilderTester] Pass #file and #line to XCTest Assert methods
[PackageBuilderTester] Pass #file and #line to XCTest Assert methods

This will show correct line and while where the test failed.

abertelrud/swift-package-manager,sschiau/swift-package-manager,haskellswift/swift-package-manager,vmanot/swift-package-manager,haskellswift/swift-package-manager,abertelrud/swift-package-manager,JGiola/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,JGiola/swift-package-manager,vmanot/swift-package-manager,vmanot/swift-package-manager,haskellswift/swift-package-manager,haskellswift/swift-package-manager,mxcl/swift-package-manager,mxcl/swift-package-manager,sschiau/swift-package-manager,mxcl/swift-package-manager,JGiola/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,sschiau/swift-package-manager,apple/swift-package-manager,sschiau/swift-package-manager,JGiola/swift-package-manager,vmanot/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,apple/swift-package-manager,JGiola/swift-package-manager,sschiau/swift-package-manager,mxcl/swift-package-manager