// newDummyCredit creates a new credit with the given hash and outpointIdx,
// locked to the votingpool address identified by the given
// series/index/branch.
func newDummyCredit(t *testing.T, pool *Pool, series uint32, index Index, branch Branch,
	txSha []byte, outpointIdx uint32) credit {
	var hash wire.ShaHash
	if err := hash.SetBytes(txSha); err != nil {
		t.Fatal(err)
	}
	// Ensure the address defined by the given series/branch/index is present on
	// the set of used addresses as that's a requirement of WithdrawalAddress.
	TstEnsureUsedAddr(t, pool, series, branch, index)
	addr := TstNewWithdrawalAddress(t, pool, series, branch, index)
	c := wtxmgr.Credit{
		OutPoint: wire.OutPoint{
			Hash:  hash,
			Index: outpointIdx,
		},
	}
	return newCredit(c, *addr)
}