Oci: added test for oci module

test/util/test_oci.py

@@ -0,0 +1,53 @@
+# Vessel Diff Tool
+#
+# Copyright 2024 Carnegie Mellon University.
+#
+# NO WARRANTY. THIS CARNEGIE MELLON UNIVERSITY AND SOFTWARE ENGINEERING
+# INSTITUTE MATERIAL IS FURNISHED ON AN "AS-IS" BASIS. CARNEGIE MELLON
+# UNIVERSITY MAKES NO WARRANTIES OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
+# AS TO ANY MATTER INCLUDING, BUT NOT LIMITED TO, WARRANTY OF FITNESS
+# FOR PURPOSE OR MERCHANTABILITY, EXCLUSIVITY, OR RESULTS OBTAINED FROM
+# USE OF THE MATERIAL. CARNEGIE MELLON UNIVERSITY DOES NOT MAKE ANY
+# WARRANTY OF ANY KIND WITH RESPECT TO FREEDOM FROM PATENT, TRADEMARK,
+# OR COPYRIGHT INFRINGEMENT.
+#
+# Licensed under a MIT (SEI)-style license, please see license.txt
+# or contact [email protected] for full terms.
+#
+# [DISTRIBUTION STATEMENT A] This material has been approved for public
+# release and unlimited distribution.  Please see Copyright notice
+# for non-US Government use and distribution.
+#
+# This Software includes and/or makes use of Third-Party Software
+# each subject to its own license.
+#
+# DM24-1321
+
+"""Unit tests for the oci module."""
+
+import json
+from pathlib import Path
+
+from vessel.utils.oci import get_manifest_digest
+
+
+def create_test_manifest(manifest_path: Path, hash: str):
+    """Creates a manifest in the given file, with the given hash."""
+    data = {"manifests": [{"digest": f"sha256:{hash}"}]}
+    with open(manifest_path, "w") as file:
+        json.dump(data, file, indent=4)
+
+
+def test_get_manifest_digest(tmp_path: Path):
+    """Tests tha parsing works for common sample transport strings."""
+
+    test_hash = (
+        "f3b3b28a45160805bb16542c9531888519430e9e6d6ffc09d72261b0d26ff74f"
+    )
+    manifest_file = "index.json"
+    manifest_path = tmp_path / manifest_file
+    create_test_manifest(manifest_path, test_hash)
+
+    digest = get_manifest_digest(str(tmp_path))
+
+    assert digest == test_hash