return &timeoutHandler{
		handler:     handler,
		testContext: ctx,
		// (no body)
	}
}

func ResetCachedEnvironment() {
	resetProxyConfig()
}

func (t *Transport) NumPendingRequestsForTesting() int {
	t.reqMu.Lock()
	defer t.reqMu.Unlock()
	return len(t.reqCanceler)
}

func (t *Transport) IdleConnKeysForTesting() (keys []string) {
	keys = make([]string, 0)
	t.idleMu.Lock()

	}

	// Verify no outstanding requests after readLoop/writeLoop
	// goroutines shut down.
	waitCondition(t, 10*time.Millisecond, func(d time.Duration) bool {
		n := tr.NumPendingRequestsForTesting()
		if n > 0 {
			if d > 0 {
				t.Logf("pending requests = %d after %v (want 0)", n, d)
			}
			return false
		}
		return true
	})
}