test: add withdraw-at-resume-timestamp regression test

tests/stream_pause_resume.rs

@@ -193,7 +193,7 @@ fn multiple_pause_resume_cycles_accumulate_correctly() {
     assert_eq!(client.withdrawable(), 350_000);
 }
 
-// ── Withdraw at same timestamp as resume ───────────────────────────────────────
+// ── Withdraw at same timestamp as resume ───────────────────────────────────
 
 #[test]
 fn withdraw_at_same_timestamp_as_resume() {
@@ -223,3 +223,31 @@ fn withdraw_at_same_timestamp_as_resume() {
     // Nothing more should be withdrawable (zero elapsed since resume)
     assert_eq!(client.withdrawable(), 0);
 }
+
+#[test]
+fn withdraw_at_same_timestamp_as_resume_yields_zero_new_tokens() {
+    let env = base_env();
+    let sender = Address::generate(&env);
+    let recipient = Address::generate(&env);
+    let (client, token_addr) = deploy_stream(&env, &sender, &recipient, 1_000, 3_600);
+    let tok = token::Client::new(&env, &token_addr);
+
+    // Stream 300s → 300_000 earned
+    advance(&env, 300);
+    client.pause(&sender);
+    // Paused for 500s (no accrual)
+    advance(&env, 500);
+    // Resume — ledger timestamp has NOT advanced yet (zero elapsed since resume)
+    client.resume(&sender);
+
+    // Withdrawable should still be 300_000 (no new tokens in zero seconds)
+    assert_eq!(client.withdrawable(), 300_000);
+
+    // Actually withdraw everything that is available
+    let withdrawn = client.withdraw(&300_000);
+    assert_eq!(withdrawn, 300_000);
+    assert_eq!(tok.balance(&recipient), 300_000);
+
+    // Nothing left
+    assert_eq!(client.withdrawable(), 0);
+}