test: run history-independent identity checks before the history lookup

tests/unit/test_les_flow_runner.py

@@ -48,8 +48,11 @@ class GuardTests(unittest.TestCase):
     def test_current_corrected_pins(self):
         with TemporaryDirectory() as directory:
             root = historical_tree(A135, directory)
-            with patch("run_uniform_les_flow.subprocess.check_output", return_value=A135 + "\n"):
-                self.assertEqual(source_guard(root, "corrected", "a135252")["base_commit"], A135)
+            with patch("run_uniform_les_flow.subprocess.check_output", return_value="historical-tree\n"):
+                identity = source_guard(root, "corrected", "a135252")
+            # base_commit comes from the pins file; the mock only feeds checkout_commit.
+            self.assertEqual(identity["base_commit"], A135)
+            self.assertEqual(identity["checkout_commit"], "historical-tree")
 
     def test_corrected_and_tamper_guard(self):
         pins = json.loads((HERE / "data/les_flow/source_pins_a135252.json").read_text())