When looking at stack traces, or disassembling code you end up with unreadable mangled Swift names like _T023UITestInstrumentsUITestsAAC11testExampleyyF. Xcode provides a tool to demangle these into the original type signature.

$ xcrun swift-demangle _T023UITestInstrumentUITestsAAC11testExampleyyF
$ _T023UITestInstrumentUITestsAAC11testExampleyyF ---> UITestInstrumentUITests.UITestInstrumentUITests.testExample () -> ()