currCmd = cmd
	}
	return currCmd
}

// Tests that the CancelRequest function is propogated to the wrapped Delegate
// RoundTripper; but only if the Delegate implements the CancelRequest function.
func TestCancelRequest(t *testing.T) {
	tests := map[string]struct {
		delegate  http.RoundTripper
		cancelled bool
	}{
		"CancelRequest propagated to delegate": {
			delegate:  &cancellableRoundTripper{},
			cancelled: true,