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/repository_simulator.py

@@ -184,6 +184,8 @@ def fetch(self, url: str) -> Iterator[bytes]:
             path = spliturl.path[len("/targets/") :]
             dir_parts, sep , prefixed_filename = path.rpartition("/")
             prefix, _, filename = prefixed_filename.partition(".")
+            if prefix == "":
+                raise ValueError("File name must have hash prefix")
             target_path = f"{dir_parts}{sep}{filename}"
 
             yield self._fetch_target(target_path, prefix)

tests/test_updater_with_simulator.py

@@ -113,6 +113,9 @@ def test_targets(self, test_case_data: Tuple[str, str]):
             [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(