conf-mode: T4845: add smoketest to detect cycles

1 files changed, 54 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_dependency_graph.py b/smoketest/scripts/cli/test_dependency_graph.py
new file mode 100755
index 000000000..45a40acc4
--- /dev/null
+++ b/smoketest/scripts/cli/test_dependency_graph.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import json
+import unittest
+from graphlib import TopologicalSorter, CycleError
+
+DEP_FILE = '/usr/share/vyos/config-mode-dependencies.json'
+
+def graph_from_dict(d):
+    g = {}
+    for k in list(d):
+        g[k] = set()
+        # add the dependencies for every sub-case; should there be cases
+        # that are mutally exclusive in the future, the graphs will be
+        # distinguished
+        for el in list(d[k]):
+            g[k] |= set(d[k][el])
+    return g
+
+class TestDependencyGraph(unittest.TestCase):
+    def setUp(self):
+        with open(DEP_FILE) as f:
+            dd = json.load(f)
+            self.dependency_graph = graph_from_dict(dd)
+
+    def test_cycles(self):
+        ts = TopologicalSorter(self.dependency_graph)
+        out = None
+        try:
+            # get node iterator
+            order = ts.static_order()
+            # try iteration
+            _ = [*order]
+        except CycleError as e:
+            out = e.args
+
+        self.assertIsNone(out)
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)