fix: consolidate MockDripsContract into tests/common/mod.rs

tests/common/mod.rs

@@ -0,0 +1,12 @@
+use soroban_sdk::{contract, contractimpl, Address, Env};
+
+/// Shared mock for the Drips protocol contract.
+/// Used by both `purge_reward_stream` and `test` integration test suites
+/// so the stub only needs to be maintained in one place (issue #199).
+#[contract]
+pub struct MockDripsContract;
+
+#[contractimpl]
+impl MockDripsContract {
+    pub fn start_stream(_env: Env, _contributor: Address, _task_id: u64, _resolution_status: u32) {}
+}

tests/purge_reward_stream.rs

@@ -4,18 +4,13 @@
 // RewardStream(task_id) / AllRewardStreams entries once the task
 // referenced by that stream has been purged.
 
+mod common;
+
+use common::MockDripsContract;
 use soroban_sdk::token::StellarAssetClient;
-use soroban_sdk::{contract, contractimpl, testutils::Address as _, Address, Env};
+use soroban_sdk::{testutils::Address as _, Address, Env};
 use vero_core_contracts::{Role, VeroContractClient};
 
-#[contract]
-pub struct MockDripsContract;
-
-#[contractimpl]
-impl MockDripsContract {
-    pub fn start_stream(_env: Env, _contributor: Address, _task_id: u64, _resolution_status: u32) {}
-}
-
 const LOCK_THRESHOLD: i128 = 100;
 
 fn setup() -> (Env, Address, Address, VeroContractClient<'static>) {

tests/test.rs

@@ -1,5 +1,8 @@
 #![cfg(any())] // Disabled due to upstream breakages
 
+mod common;
+use common::MockDripsContract;
+
 use soroban_sdk::token::{Client as TokenClient, StellarAssetClient as TestTokenClient};
 use soroban_sdk::{
     testutils::{Address as _, Ledger as _},
@@ -1269,13 +1272,6 @@ fn test_simulated_migration_failure_rolls_back() {
     assert_eq!(client.get_storage_version(), 0);
 }
 
-#[contract]
-pub struct MockDripsContract;
-
-#[contractimpl]
-impl MockDripsContract {
-    pub fn start_stream(_env: Env, _contributor: Address, _task_id: u64, _resolution_status: u32) {}
-}
 #[test]
 fn test_purge_done_task_removes_storage() {
     let (env, _contract_id, admin, token, client) = setup();