fix: Add test to verify PDF support

Author: tmathern

tests/fixtures/files-for-reading-tests/C_with_CAWG_data.jpg

@@ -248,6 +248,30 @@ def test_read_cawg_data_file(self):
             assert active_manifest is not None, "Active manifest should not be null"
             assert len(active_manifest) > 0, "Active manifest should not be empty"
 
+    def test_read_known_pdf_file(self):
+        """Test reading C2PA metadata from adobe-20240110-single_manifest_store.pdf file."""
+        file_path = os.path.join(self.data_dir, "known-files", "adobe-20240110-single_manifest_store.pdf")
+
+        with open(file_path, "rb") as file:
+            reader = Reader("pdf", file)
+            json_data = reader.json()
+            self.assertIsInstance(json_data, str)
+
+            # Parse the JSON and verify specific fields
+            manifest_data = json.loads(json_data)
+
+            # Verify basic manifest structure
+            self.assertIn("manifests", manifest_data)
+            self.assertIn("active_manifest", manifest_data)
+
+            # Get the active manifest
+            active_manifest_id = manifest_data["active_manifest"]
+            active_manifest = manifest_data["manifests"][active_manifest_id]
+
+            # Verify manifest is not null or empty
+            assert active_manifest is not None, "Active manifest should not be null"
+            assert len(active_manifest) > 0, "Active manifest should not be empty"
+
 
 class TestBuilder(unittest.TestCase):
     def setUp(self):