Tests: assert that test_targets use hash prefixes

Make sure that hash prefixes are added when downloading a target
through the repository simulator.

Signed-off-by: Martin Vrachev <mvrachev@vmware.com>

tests/test_updater_with_simulator.py

@@ -113,6 +113,9 @@ def test_targets(self, test_case_data: TargetData):
             [file_info]
         )
 
+        # Assert consistent_snapshot is True and downloaded targets have prefix.
+        self.assertTrue(self.sim.root.consistent_snapshot)
+        self.assertTrue(updater.config.prefix_targets_with_hash)
         # download target, assert it is in cache and content is correct
         local_path = updater.download_target(file_info, self.targets_dir)
         self.assertEqual(