diff --git a/testcases/misc/test_permissions.py b/testcases/misc/test_permissions.py
new file mode 100644
index 0000000..241d1a8
--- /dev/null
+++ b/testcases/misc/test_permissions.py
@@ -0,0 +1,93 @@
+import testhelper
+import os
+import pytest
+import pwd
+import grp
+import shutil
+from pathlib import Path
+
+test_info_file = os.getenv("TEST_INFO_FILE")
+test_info = testhelper.read_yaml(test_info_file)
+test_string = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+
+# test_supplementary_group:
+# This test is to check writes to a folder owned by a supplementary group.
+#
+# Requirements:
+# 1. username in share["user"] exists
+# 2. username is part of supplementary group provided in
+#    user["extra"]["supplementary_group"]
+# 3. share["backend"]["path"] should be set
+#
+# Steps:
+# 1. Create folder test_subdir/ on direct path with
+#    group set to sgroup and mode 0770
+# 2. Upload file to test_subdir/test-cp
+#
+# Expected:
+# Copy passes
+
+
+# function to check if requirements are met
+def check_reqs_supplementary_group(share: dict, sgroup: str) -> bool:
+    if share["backend"]["path"] is None:
+        return False
+
+    username = list(share["users"].keys())[0]
+    try:
+        pwd.getpwnam(username)
+        if username not in grp.getgrnam(sgroup).gr_mem:
+            return False
+    except KeyError:
+        return False
+    return True
+
+
+def gen_supplementary_group_param(test_info: dict) -> list:
+    if not test_info:
+        return []
+    sgroup = testhelper.get_extra_configuration(
+        test_info, "supplementary_group"
+    )
+    if sgroup is None:
+        return []
+
+    arr = []
+    for s in testhelper.get_shares(test_info).values():
+        if check_reqs_supplementary_group(s, sgroup):
+            arr.append((s["server"], s["name"]))
+    return arr
+
+
+@pytest.mark.privileged
+@pytest.mark.parametrize(
+    "ipaddr,share_name", gen_supplementary_group_param(test_info)
+)
+def test_supplementary_group(ipaddr: str, share_name: str) -> None:
+    share = testhelper.get_share(test_info, share_name)
+    fs_path = Path(share["backend"]["path"])
+    sgroup = testhelper.get_extra_configuration(
+        test_info, "supplementary_group"
+    )
+    test_subdir = Path("supplementary_group")
+    mount_params = testhelper.get_mount_parameters(test_info, share_name)
+
+    # setup local testdir
+    testdir = fs_path / test_subdir
+    testdir.mkdir(exist_ok=True)
+    shutil.chown(testdir, group=sgroup)
+    testdir.chmod(0o770)
+
+    smbclient = testhelper.SMBClient(
+        ipaddr,
+        mount_params["share"],
+        mount_params["username"],
+        mount_params["password"],
+    )
+
+    try:
+        remote_test_file = str(Path("/") / test_subdir / Path("test-cp"))
+        smbclient.write_text(remote_test_file, test_string)
+    finally:
+        smbclient.disconnect()
+        shutil.rmtree(testdir)