Verify that AddWatchedAddress should never add a script which already represents a key from the appropriate wallet

sign_test.go

func TestBitcoinCashWallet_verifyWatchScriptPut(t *testing.T) {
	// Verify that AddWatchedAddress should never add a script which already represents a key from the appropriate wallet
	w, err := newMockWallet()
	if err != nil {
		t.Error(err)
	}
	keys := w.km.GetKeys()

	addr, err := w.km.KeyToAddress(keys[0])
	if err != nil {
		t.Fatal(err)
	}

	err = w.AddWatchedAddress(addr)
	if err == nil {
		t.Error("Put watched scripts fails on key manager owned key")
	}
}