1 files changed, 5 insertions, 5 deletions
diff --git a/std/io/util_test.ts b/std/io/util_test.ts
index 17f11b945..68a398bd1 100644
--- a/std/io/util_test.ts
+++ b/std/io/util_test.ts
@@ -9,31 +9,31 @@ test("[io/tuil] copyBytes", function (): void {
 
   dst.fill(0);
   let src = Uint8Array.of(1, 2);
-  let len = copyBytes(dst, src, 0);
+  let len = copyBytes(src, dst, 0);
   assert(len === 2);
   assertEquals(dst, Uint8Array.of(1, 2, 0, 0));
 
   dst.fill(0);
   src = Uint8Array.of(1, 2);
-  len = copyBytes(dst, src, 1);
+  len = copyBytes(src, dst, 1);
   assert(len === 2);
   assertEquals(dst, Uint8Array.of(0, 1, 2, 0));
 
   dst.fill(0);
   src = Uint8Array.of(1, 2, 3, 4, 5);
-  len = copyBytes(dst, src);
+  len = copyBytes(src, dst);
   assert(len === 4);
   assertEquals(dst, Uint8Array.of(1, 2, 3, 4));
 
   dst.fill(0);
   src = Uint8Array.of(1, 2);
-  len = copyBytes(dst, src, 100);
+  len = copyBytes(src, dst, 100);
   assert(len === 0);
   assertEquals(dst, Uint8Array.of(0, 0, 0, 0));
 
   dst.fill(0);
   src = Uint8Array.of(3, 4);
-  len = copyBytes(dst, src, -2);
+  len = copyBytes(src, dst, -2);
   assert(len === 2);
   assertEquals(dst, Uint8Array.of(3, 4, 0, 0));
 });