diff --git a/contracts/split/src/validation.rs b/contracts/split/src/validation.rs
index e0c16da..480c4a7 100644
--- a/contracts/split/src/validation.rs
+++ b/contracts/split/src/validation.rs
@@ -103,4 +103,17 @@ mod tests {
         let v: Vec<Address> = Vec::new(&env);
         assert!(assert_unique_recipients(&env, &v.to_vec()).is_ok());
     }
+
+    #[test]
+    fn two_identical_addresses_returns_duplicate_error() {
+        let env = Env::default();
+        let a = Address::generate(&env);
+        let mut v: Vec<Address> = Vec::new(&env);
+        v.push_back(a.clone());
+        v.push_back(a.clone());
+        assert_eq!(
+            assert_unique_recipients(&env, &v.to_vec()),
+            Err(ContractError::DuplicateRecipient)
+        );
+    }
 }
diff --git a/tests/event_log_tests.rs b/tests/event_log_tests.rs
index 4954f84..926fb43 100644
--- a/tests/event_log_tests.rs
+++ b/tests/event_log_tests.rs
@@ -1,10 +1,12 @@
 #![cfg(test)]
 
 use soroban_sdk::{
-    testutils::{Address as _, Ledger, Events},
+    testutils::{Address as _, Ledger, Events, BytesN as _},
     token::{Client as TokenClient, StellarAssetClient},
-    Address, Env, Symbol, Vec, Map,
+    Address, Env, Symbol, Vec, Map, BytesN,
 };
+use split_contracts::types::InvoiceStatus;
+use split_contracts::events::{invoice_state_changed, allowlist_updated, dispute_raised};
 
 #[test]
 fn test_event_log_stores_creation_event() {
@@ -243,3 +245,75 @@ fn test_event_log_with_multiple_recipients() {
     
     // Verify release event includes all 3 recipient addresses
 }
+
+#[test]
+fn invoice_state_changed_status_symbols() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let invoice_id = 1u64;
+    let actor = Address::generate(&env);
+
+    let test_cases = vec![
+        (None, InvoiceStatus::Pending, "none", "pending"),
+        (Some(InvoiceStatus::Pending), InvoiceStatus::Released, "pending", "released"),
+        (Some(InvoiceStatus::Released), InvoiceStatus::Refunded, "released", "refunded"),
+        (Some(InvoiceStatus::Refunded), InvoiceStatus::Expired, "refunded", "expired"),
+    ];
+
+    for (from_status, to_status, expected_from, expected_to) in test_cases {
+        let before_events = env.events().all();
+        invoice_state_changed(&env, invoice_id, from_status.as_ref(), &to_status, &actor);
+        let after_events = env.events().all();
+
+        assert!(after_events.len() > before_events.len(), "Event should be published");
+    }
+}
+
+#[test]
+fn allowlist_updated_event_add() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let invoice_id = 1u64;
+    let creator = Address::generate(&env);
+    let payer = Address::generate(&env);
+
+    let before_events = env.events().all();
+    allowlist_updated(&env, invoice_id, &creator, &payer, true);
+    let after_events = env.events().all();
+
+    assert!(after_events.len() > before_events.len(), "Event should be published");
+}
+
+#[test]
+fn allowlist_updated_event_remove() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let invoice_id = 1u64;
+    let creator = Address::generate(&env);
+    let payer = Address::generate(&env);
+
+    let before_events = env.events().all();
+    allowlist_updated(&env, invoice_id, &creator, &payer, false);
+    let after_events = env.events().all();
+
+    assert!(after_events.len() > before_events.len(), "Event should be published");
+}
+
+#[test]
+fn dispute_raised_event_carries_payer_and_hash() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let invoice_id = 1u64;
+    let payer = Address::generate(&env);
+    let reason_hash = BytesN::<32>::random(&env);
+
+    let before_events = env.events().all();
+    dispute_raised(&env, invoice_id, &payer, &reason_hash);
+    let after_events = env.events().all();
+
+    assert!(after_events.len() > before_events.len(), "Event should be published");
+}