Use a real address for dummy spends

crates/core/component/shielded-pool/src/spend/plan.rs

@@ -2,7 +2,7 @@ use ark_ff::UniformRand;
 use decaf377::{FieldExt, Fq, Fr};
 use decaf377_rdsa::{Signature, SpendAuth};
 use penumbra_asset::{Balance, Value, STAKING_TOKEN_ASSET_ID};
-use penumbra_keys::{Address, FullViewingKey};
+use penumbra_keys::{keys::AddressIndex, FullViewingKey};
 use penumbra_proto::{core::component::shielded_pool::v1 as pb, DomainType};
 use penumbra_sct::Nullifier;
 use penumbra_tct as tct;
@@ -42,8 +42,9 @@ impl SpendPlan {
     }
 
     /// Create a dummy [`SpendPlan`].
-    pub fn dummy<R: CryptoRng + RngCore>(rng: &mut R) -> SpendPlan {
-        let dummy_address = Address::dummy(rng);
+    pub fn dummy<R: CryptoRng + RngCore>(rng: &mut R, fvk: &FullViewingKey) -> SpendPlan {
+        // A valid address we can spend; since the note is hidden, we can just pick the default.
+        let dummy_address = fvk.payment_address(AddressIndex::default()).0;
         let rseed = Rseed::generate(rng);
         let dummy_note = Note::from_parts(
             dummy_address,