diff --git a/packages/codec/tests/bytes-like.test.ts b/packages/codec/tests/bytes-like.test.ts
index a32ca0ba5..549fcb301 100644
--- a/packages/codec/tests/bytes-like.test.ts
+++ b/packages/codec/tests/bytes-like.test.ts
@@ -60,14 +60,19 @@ test("compare BytesLike", (t) => {
 });
 
 test("indexOf BytesLike", (t) => {
-  t.is(2, indexOf([1, 2, 3, 4, 5], [3, 4]));
-  t.is(3, indexOf([1, 2, 3, 4, 5], [4, 5]));
-  t.is(-1, indexOf([1, 2, 3, 4, 5], [6, 7]));
-  t.is(0, indexOf([1, 2, 3, 4, 5], []));
-  t.is(-1, indexOf([], [1, 2]));
-  t.is(0, indexOf([1, 2, 1, 2, 1, 2], [1, 2]));
-  t.is(1, indexOf([1, 2, 1, 2, 1, 2], [2, 1]));
-  t.is(0, indexOf([1, 2, 1, 2, 1, 2], [1, 2, 1]));
-  t.is(1, indexOf([1, 2, 1, 2, 1, 2], [2, 1, 2]));
-  t.is(2, indexOf([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [3, 4, 5, 6]));
+  t.is(indexOf([1, 2, 3, 4, 5], [3, 4]), 2);
+  t.is(indexOf([1, 2, 3, 4, 5], []), 0);
+  t.is(indexOf([1, 2, 3], [1, 2, 3, 4]), -1);
+  t.is(indexOf([1, 2, 3, 4, 5], [6, 7]), -1);
+  t.is(indexOf([1, 2, 3, 4, 5], [1, 2]), 0);
+  t.is(indexOf([1, 2, 3, 4, 5], [4, 5]), 3);
+  t.is(indexOf([1, 2, 3], [1, 2, 3]), 0);
+  t.is(indexOf([1, 2, 3, 4, 5], [3]), 2);
+  t.is(indexOf([1, 2, 1, 2, 3], [1, 2, 3]), 2);
+  t.is(indexOf([1, 2, 3, 1, 2, 3, 4], [1, 2, 3, 4]), 3);
+
+  t.is(indexOf([1, 2, 1, 2, 3], [1, 2, 3]), 2);
+  t.is(indexOf([1, 2, 1, 2, 1, 3, 4], [1, 2, 3]), -1);
+
+  t.is(indexOf([1, 1, 2, 3, 5, 8], [1, 1, 2, 3]), 0);
 });