Suppress deprecated-declarations warning when calling uniqueIndentifier, e.g. for TestFlight API

snippet.m

#ifdef TESTING
    /*
     Disable deprecated-declarations warning.
     See http://clang.llvm.org/docs/UsersManual.html#diagnostics_pragmas
     
     Basic workflow:
     
        1. push current warnings onto stack
        2. ignore warning we know will get thrown
        3. do dodgy thing that causes warning
        4. pop warnings - go back to what we had before we started fiddling with them
     
     */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    [TestFlight setDeviceIdentifier:[[UIDevice currentDevice] uniqueIdentifier]];
#pragma clang diagnostic pop
#endif