Restore default implementations of code in Go unit tests

gistfile1.txt

If you replace a default function in a package for unit testing purposes, make sure you 
restore it so the next test does not mistakenly inherit the reassignment:

 func TestEndpointNoScopes(t *testing.T) {
         saveAuth := auth
         defer func() {
                 auth = saveAuth
         }()

         auth = func(*http.Request, []string) (bool, error) {
                 return false, fmt.Errorf("some error")
         }
...

 }