diff --git a/cts.json b/cts.json
index 2ff049c..72734cc 100644
--- a/cts.json
+++ b/cts.json
@@ -3951,5 +3951,48 @@
       1
     ],
     "since": "2.2.0"
+  },
+
+  {
+    "name": "pfadd command",
+    "command": [
+      "pfadd hll a b c d e",
+      "pfcount hll"
+    ],
+    "result": [
+      1,
+      5
+    ],
+    "since": "2.8.9"
+  },
+
+  {
+    "name": "pfcount command",
+    "command": [
+      "pfadd hll a b c d e",
+      "pfcount hll"
+    ],
+    "result": [
+      1,
+      5
+    ],
+    "since": "2.8.9"
+  },
+
+  {
+    "name": "pfmerge command",
+    "command": [
+      "pfadd hll1 0 1",
+      "pfadd hll2 2 3",
+      "pfmerge hll0 hll1 hll2",
+      "pfcount hll0"
+    ],
+    "result": [
+      1,
+      1,
+      "OK",
+      4
+    ],
+    "since": "2.8.9"
   }
 ]
diff --git a/redis_compatibility_test.py b/redis_compatibility_test.py
index b83d982..3556cc5 100644
--- a/redis_compatibility_test.py
+++ b/redis_compatibility_test.py
@@ -49,7 +49,7 @@ def report_result():
               f"rate: {repr(passed / total * 100)}%")
         if args.show_failed and len(failed) != 0:
             print(f"This is failed tests for {args.specific_version}:")
-            print(failed)
+            print('\n'.join(str(fail) for fail in failed))
             exit(-1)
     else:
         for v, t in sorted(g_results.items()):
@@ -57,7 +57,7 @@ def report_result():
                   f"rate: {repr(t.passed / t.total * 100)}%")
             if args.show_failed and len(t.failed) != 0:
                 print(f"This is failed tests for {v}:")
-                print(t.failed)
+                print('\n'.join(str(fail) for fail in t.failed))
                 exit(-1)