diff --git a/selftest/test-info1.yml b/selftest/test-info1.yml
index f1a689c..2ad9435 100644
--- a/selftest/test-info1.yml
+++ b/selftest/test-info1.yml
@@ -9,6 +9,13 @@ users:
 # Backend filesystem of the exported shares
 backend: glusterfs
 
+# Additional information which may be used by tests here
+# some tests may be skipped if the required config option is not set
+extra:
+  # The supplementary group to be used by test_permissions
+  supplementary_group: test_sg
+
+
 # shares: List of dict of exported shares
 shares:
   # share export1
@@ -19,6 +26,8 @@ shares:
     backend:
       # If present override default backend filesystem
       name: cephfs.vfs
+      # if present, provide access to backend filesystem
+      path: /mnt/backend/export1
     # If present, use these credentials to perform the
     # tests for this share
     users:
diff --git a/selftest/test_testhelper.py b/selftest/test_testhelper.py
index b157f95..6dd45e6 100644
--- a/selftest/test_testhelper.py
+++ b/selftest/test_testhelper.py
@@ -9,6 +9,7 @@ def test_read_yaml1():
     assert export1["server"] == "hostname1"
     assert export1["path"] == "/mnt/share/export1-cephfs-vfs"
     assert export1["backend"]["name"] == "cephfs.vfs"
+    assert export1["backend"]["path"] == "/mnt/backend/export1"
     assert "user1" not in export1["users"]
     assert "test2" in export1["users"]
     assert export1["users"]["test2"] == "x"
@@ -17,6 +18,7 @@ def test_read_yaml1():
     assert export2["server"] == "server_name"
     assert "path" not in export2
     assert export2["backend"]["name"] == "glusterfs"
+    assert export2["backend"]["path"] is None
     assert "test2" not in export2["users"]
     assert "user2" in export2["users"]
     assert export2["users"]["user2"] == "user2password"
@@ -60,3 +62,16 @@ def test_generate_exported_shares():
         arr.append((share["server"], share["name"]))
     assert len(arr) == 1
     assert ("server_name", "export2") in arr
+
+
+def test_get_extra_configuration():
+    testinfo = testhelper.read_yaml("test-info1.yml")
+    sg = testhelper.get_extra_configuration(testinfo, "supplementary_group")
+    assert sg == "test_sg", "Could not read extra configuration"
+    other = testhelper.get_extra_configuration(testinfo, "other")
+    assert other is None, "Incorrectly read other from extra configuration"
+
+    # test-info2.yml does not have extra section
+    testinfo = testhelper.read_yaml("test-info2.yml")
+    sg = testhelper.get_extra_configuration(testinfo, "supplementary_group")
+    assert sg is None, "Could not read extra configuration"
diff --git a/test-info.yml.example b/test-info.yml.example
index f1a689c..371b0a0 100644
--- a/test-info.yml.example
+++ b/test-info.yml.example
@@ -9,6 +9,12 @@ users:
 # Backend filesystem of the exported shares
 backend: glusterfs
 
+# Additional information which may be used by tests here
+# some tests may be skipped if the required config option is not set
+extra:
+  # The supplementary group to be used by test_supplementary_group
+  supplementary_group: sg
+
 # shares: List of dict of exported shares
 shares:
   # share export1
@@ -19,6 +25,8 @@ shares:
     backend:
       # If present override default backend filesystem
       name: cephfs.vfs
+      # If present, provide access to backend filesystem
+      path: /mnt/backend/export1
     # If present, use these credentials to perform the
     # tests for this share
     users:
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)
diff --git a/testhelper/testhelper.py b/testhelper/testhelper.py
index 457ca9f..06daecc 100644
--- a/testhelper/testhelper.py
+++ b/testhelper/testhelper.py
@@ -54,10 +54,11 @@ def read_yaml(test_info_file):
             shares[sharename] = {"name": sharename}
         share = shares[sharename]
         share.setdefault("name", sharename)
-        share.setdefault("backend", {})
         share.setdefault("server", default_server)
         share.setdefault("users", default_users)
+        share.setdefault("backend", {})
         share["backend"].setdefault("name", default_backend)
+        share["backend"].setdefault("path", None)
 
     test_info["shares"] = shares
 
@@ -191,3 +192,18 @@ def get_exported_shares(test_info: dict) -> typing.List[str]:
         if not is_premounted_share(share):
             arr.append(share["name"])
     return arr
+
+
+def get_extra_configuration(test_info: dict, extra_var: str) -> typing.Any:
+    """Return value of config set in extra section
+
+    Parameters:
+    test_info: Dict containing the parsed yaml file
+    extra_var: string containing extra config value required
+    Returns:
+    value set for the extra_var in the extra section
+    """
+    extra = test_info.get("extra")
+    if extra is None:
+        return None
+    return extra.get(extra_var)
diff --git a/tox.ini b/tox.ini
index 4f91051..9cac483 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,6 +39,7 @@ commands = pytest -vrfEsxXpP testcases/consistency
 deps =
     pytest
     pyyaml
+    pysmb
 changedir = {toxinidir}/selftest
 commands = pytest -vrfEsxXpP .