Fix test that sometimes returned the swapped object instead of encoding

tests/unit/type/hash.tcl

@@ -15,8 +15,8 @@ start_server {tags {"hash"}} {
     } {8}
 
     test {Is the small hash encoded with a zipmap?} {
-        r debug object smallhash
-    } {*zipmap*}
+        assert_encoding zipmap smallhash
+    }
 
     test {HSET/HLEN - Big hash creation} {
         array set bighash {}