Provide tests for the registry object

Specifically here a new placeholder for registry entry object tests and
tests for handling ruleset/marker output.

Author: ross-spencer

src/jsonid/registry_class.py

@@ -93,8 +93,8 @@ def json(self):
                 replace_me = helpers.substitute_type_text(replace_me)
                 marker["ISTYPE"] = replace_me
                 new_markers.append(marker)
-            except KeyError:
-                pass
+            except (KeyError, AttributeError):
+                new_markers.append(marker)
         if not new_markers:
             return obj.__dict__
         obj.markers = new_markers

tests/test_registry_class.py

@@ -0,0 +1,93 @@
+"""Tests for the registry class object."""
+
+import pytest
+
+from src.jsonid import registry_class
+
+registry_marker_tests = [
+    (
+        [
+            {"KEY": "$id", "STARTSWITH": "http://www.parcore.org/schema/"},
+            {"KEY": "$schema", "EXISTS": None},
+            {"KEY": "definitions", "ISTYPE": dict},
+        ],
+        {
+            "identifier": "",
+            "name": [],
+            "version": None,
+            "description": [],
+            "pronom": "",
+            "wikidata": "",
+            "loc": "",
+            "archive_team": "",
+            "rfc": "",
+            "mime": [],
+            "markers": [
+                {"KEY": "$id", "STARTSWITH": "http://www.parcore.org/schema/"},
+                {"KEY": "$schema", "EXISTS": None},
+                {"KEY": "definitions", "ISTYPE": "map"},
+            ],
+            "depth": 0,
+            "additional": "",
+            "encoding": "",
+        },
+    ),
+    (
+        [
+            {"KEY": "$id", "STARTSWITH": "http://www.parcore.org/schema/"},
+            {"KEY": "$schema", "EXISTS": None},
+            {"KEY": "definitions", "ISTYPE": None},
+        ],
+        {
+            "identifier": "",
+            "name": [],
+            "version": None,
+            "description": [],
+            "pronom": "",
+            "wikidata": "",
+            "loc": "",
+            "archive_team": "",
+            "rfc": "",
+            "mime": [],
+            "markers": [
+                {"KEY": "$id", "STARTSWITH": "http://www.parcore.org/schema/"},
+                {"KEY": "$schema", "EXISTS": None},
+                {"KEY": "definitions", "ISTYPE": None},
+            ],
+            "depth": 0,
+            "additional": "",
+            "encoding": "",
+        },
+    ),
+    (
+        [],
+        {
+            "identifier": "",
+            "name": [],
+            "version": None,
+            "description": [],
+            "pronom": "",
+            "wikidata": "",
+            "loc": "",
+            "archive_team": "",
+            "rfc": "",
+            "mime": [],
+            "markers": [],
+            "depth": 0,
+            "additional": "",
+            "encoding": "",
+        },
+    ),
+]
+
+
+@pytest.mark.parametrize("entry, expected", registry_marker_tests)
+def test_registry_entry_markers_json(entry, expected):
+    """Outputting the markers as JSON requires some subtle changes to
+    types so they can be stringified correctly. Test these work as
+    throughout any changes to the code base.
+    """
+    entry_obj = registry_class.RegistryEntry()
+    entry_obj.markers = entry
+    res = entry_obj.json()
+    assert res == expected