diff --git a/test/notebook_test_runner/test_notebooks_in_dss_docker_image.py b/test/notebook_test_runner/test_notebooks_in_dss_docker_image.py
index fb9f3e99..8d16fb74 100644
--- a/test/notebook_test_runner/test_notebooks_in_dss_docker_image.py
+++ b/test/notebook_test_runner/test_notebooks_in_dss_docker_image.py
@@ -64,7 +64,7 @@ def notebook_test_container_with_log(notebook_test_container):
     print(socket.stat())
     print()
     logs = notebook_test_container.logs().decode("utf-8").strip()
-    print("Container Logs: {logs or '(empty)'}", flush=True)
+    print(f"Container Logs: {logs or '(empty)'}", flush=True)
     yield notebook_test_container
 
 
diff --git a/test/unit/entrypoint/test_file_permissions.py b/test/unit/entrypoint/test_file_permissions.py
new file mode 100644
index 00000000..0b7b812c
--- /dev/null
+++ b/test/unit/entrypoint/test_file_permissions.py
@@ -0,0 +1,58 @@
+import pytest
+import os
+import re
+import stat
+
+from exasol.ds.sandbox.runtime.ansible.roles.entrypoint.files import entrypoint
+
+# def stat_result(
+#         st_mode=0,
+#         st_ino=0,
+#         st_dev=0,
+#         st_nlink=0,
+#         st_uid=0,
+#         st_gid=0,
+#         st_size=0,
+#         st_atime=0,
+#         st_mtime=0,
+#         st_ctime=0,
+# ):
+#     return os.stat_result((
+#         st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid, st_size,
+#         st_atime, st_mtime, st_ctime,
+#     ))
+
+
+def test_file_inspector_non_existing_file(mocker):
+    mocker.patch("os.stat")
+    # need to mock os.path.exists as os.path.exists seems to call os.stat :)
+    mocker.patch("os.path.exists", return_value=False)
+    testee = entrypoint.FileInspector("/non/existing/file")
+    actual = testee.is_group_accessible()
+    assert actual == False
+    assert not os.stat.called
+
+
+@pytest.fixture
+def accessible_file(tmp_path):
+    mode = os.stat(tmp_path).st_mode | stat.S_IRGRP | stat.S_IWGRP
+    os.chmod(tmp_path, mode)
+    return tmp_path
+
+
+@pytest.fixture
+def non_accessible_file(tmp_path):
+    mode = stat.S_IRUSR | stat.S_IWUSR
+    os.chmod(tmp_path, mode)
+    return tmp_path
+
+
+def test_file_inspector_group_accessible(accessible_file):
+    testee = entrypoint.FileInspector(accessible_file)
+    assert testee.is_group_accessible()
+
+
+def test_file_inspector_not_group_accessible(non_accessible_file, caplog):
+    testee = entrypoint.FileInspector(non_accessible_file)
+    assert not testee.is_group_accessible()
+    assert re.match(r"ERROR .* No rw permissions for group", caplog.text)