Added shadow option to tree for mig

tests/unit/cli/build/test_tree_shadow_folder.py

@@ -0,0 +1,66 @@
+import os
+import sys
+import json
+import tempfile
+import shutil
+import unittest
+from unittest.mock import patch
+
+# Import the script as a module (assumes the script is named tree.py)
+SCRIPT_PATH = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), "../../../../cli/build/tree.py")
+)
+
+class TestTreeShadowFolder(unittest.TestCase):
+    def setUp(self):
+        # Create temp roles dir and a dummy role
+        self.roles_dir = tempfile.mkdtemp()
+        self.role_name = "dummyrole"
+        self.role_path = os.path.join(self.roles_dir, self.role_name)
+        os.makedirs(os.path.join(self.role_path, "meta"))
+
+        # Prepare shadow dir
+        self.shadow_dir = tempfile.mkdtemp()
+
+        # Patch sys.argv for the script
+        self.orig_argv = sys.argv[:]
+        sys.argv = [
+            SCRIPT_PATH,
+            "-d", self.roles_dir,
+            "-s", self.shadow_dir,
+            "-o", "json"
+        ]
+
+    def tearDown(self):
+        sys.argv = self.orig_argv
+        shutil.rmtree(self.roles_dir)
+        shutil.rmtree(self.shadow_dir)
+
+    @patch("cli.build.tree.build_mappings")
+    @patch("cli.build.tree.output_graph")
+    def test_tree_json_written_to_shadow_folder(self, mock_output_graph, mock_build_mappings):
+        # Prepare dummy graph
+        dummy_graph = {"dummy": {"test": 42}}
+        mock_build_mappings.return_value = dummy_graph
+
+        # Run the script (as __main__)
+        import runpy
+        runpy.run_path(SCRIPT_PATH, run_name="__main__")
+
+        # Check file in shadow folder
+        expected_tree_path = os.path.join(
+            self.shadow_dir, self.role_name, "meta", "tree.json"
+        )
+        self.assertTrue(os.path.isfile(expected_tree_path), "tree.json not found in shadow folder")
+
+        # Check contents
+        with open(expected_tree_path) as f:
+            data = json.load(f)
+        self.assertEqual(data, dummy_graph, "tree.json content mismatch")
+
+        # Ensure nothing was written to original meta/
+        original_tree_path = os.path.join(self.role_path, "meta", "tree.json")
+        self.assertFalse(os.path.isfile(original_tree_path), "tree.json should NOT be in role's meta/")
+
+if __name__ == "__main__":
+    unittest.main()