fix: FFI test uses valid bech32 address instead of fake string

test_validate_send_request_params_valid used "zs" + "1"*76 which
fails bech32 checksum validation. Replace with properly encoded
test address using bech32 crate (added as dev-dependency).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: VictorLux

Cargo.lock

@@ -22,5 +22,8 @@ hex.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 
+[dev-dependencies]
+bech32 = { workspace = true }
+
 [build-dependencies]
 uniffi = { version = "0.28", features = ["build"] }

crates/zipherx-ffi/Cargo.toml

@@ -1739,9 +1739,16 @@ mod tests {
         assert!(validate_address(addr));
     }
 
+    /// Generate a valid bech32-encoded "zs" address for testing.
+    fn test_zs_address() -> String {
+        use bech32::ToBase32;
+        let dummy_data = vec![0xAAu8; 43]; // 43 bytes = Sapling payment address
+        bech32::encode("zs", dummy_data.to_base32(), bech32::Variant::Bech32).unwrap()
+    }
+
     #[test]
     fn test_validate_send_request_params_valid() {
-        let addr = "zs".to_string() + &"1".repeat(76);
+        let addr = test_zs_address();
         let result = validate_send_request_params(addr, 50_000, 10_000, None);
         assert!(result.is_ok());
     }