diff --git a/program/rust/src/processor/upd_price.rs b/program/rust/src/processor/upd_price.rs
index f3a3378c..278673b4 100644
--- a/program/rust/src/processor/upd_price.rs
+++ b/program/rust/src/processor/upd_price.rs
@@ -303,6 +303,8 @@ fn find_publisher_index(comps: &[PriceComponent], key: &Pubkey) -> Option<usize>
         let mut right = comps.len();
         while left < right {
             let mid = left + (right - left) / 2;
+            // sol_memcmp is much faster than rust default comparison of Pubkey. It costs
+            // 10CU whereas rust default comparison costs a few times more.
             match sol_memcmp(comps[mid].pub_.as_ref(), key.as_ref(), 32) {
                 i if i < 0 => {
                     left = mid + 1;
@@ -362,7 +364,12 @@ mod test {
             assert_eq!(find_publisher_index(&comps, &comp.pub_), Some(idx));
         });
 
-        assert_eq!(find_publisher_index(&comps, &Pubkey::new_unique()), None);
+        let mut key_not_in_list = Pubkey::new_unique();
+        while comps.iter().any(|comp| comp.pub_ == key_not_in_list) {
+            key_not_in_list = Pubkey::new_unique();
+        }
+
+        assert_eq!(find_publisher_index(&comps, &key_not_in_list), None);
     }
 
     /// Test the find_publisher_index method works with a sorted list of components.
@@ -374,6 +381,11 @@ mod test {
             assert_eq!(find_publisher_index(&comps, &comp.pub_), Some(idx));
         });
 
-        assert_eq!(find_publisher_index(&comps, &Pubkey::new_unique()), None);
+        let mut key_not_in_list = Pubkey::new_unique();
+        while comps.iter().any(|comp| comp.pub_ == key_not_in_list) {
+            key_not_in_list = Pubkey::new_unique();
+        }
+
+        assert_eq!(find_publisher_index(&comps, &key_not_in_list), None);
     }
 }
diff --git a/program/rust/src/tests/test_add_publisher.rs b/program/rust/src/tests/test_add_publisher.rs
index 6511acdf..45d6172c 100644
--- a/program/rust/src/tests/test_add_publisher.rs
+++ b/program/rust/src/tests/test_add_publisher.rs
@@ -199,7 +199,7 @@ fn test_add_publisher() {
     // Make sure that publishers get sorted after adding the default publisher
     {
         let price_data = load_checked::<PriceAccount>(&price_account, PC_VERSION).unwrap();
-        println!("{:?}", price_data.comp_.map(|x| x.pub_));
+        assert!(price_data.num_ == PC_NUM_COMP);
         for i in 1..PC_NUM_COMP {
             assert!(price_data.comp_[i as usize].pub_ > price_data.comp_[(i - 1) as usize].pub_);
         }