Run test cases on hns

tosfs/tests/test_tosfs.py

@@ -857,11 +857,20 @@ def test_big_file_append(
         f.write(content)
 
     append_content = "a" * 1024 * 1024
-    with pytest.raises(TosServerError):
+    if tosfs._is_fns_bucket(bucket):
+        with pytest.raises(TosServerError):
+            with tosfs.open(f"{bucket}/{temporary_workspace}/{file_name}", "a") as f:
+                f.write(append_content)
+    else:
         with tosfs.open(f"{bucket}/{temporary_workspace}/{file_name}", "a") as f:
             f.write(append_content)
 
+        with tosfs.open(f"{bucket}/{temporary_workspace}/{file_name}", "r") as f:
+            assert f.read() == content + append_content
+
     another_file = random_str()
+    if tosfs._is_hns_bucket(bucket):
+        tosfs.touch(f"{bucket}/{temporary_workspace}/{another_file}")
     with tosfs.open(f"{bucket}/{temporary_workspace}/{another_file}", "a") as f:
         f.write(content)