// It should not be seen by the user.
var errRequestDone = errors.New("net/http: request completed")

func nop() {}

// testHooks. Always non-nil.
var (
	testHookEnterRoundTrip   = nop
	testHookWaitResLoop      = nop
	testHookRoundTripRetried = nop
	testHookPrePendingDial   = nop
	testHookPostPendingDial  = nop

	testHookMu                     sync.Locker = fakeLocker{} // guards following