Write tests for parse_json and verbose_name templatetags

aleksis/core/tests/templatetags/test_data_helpers.py

-from aleksis.core.templatetags.data_helpers import get_dict
+import json
+
+import pytest
+
+from aleksis.core.templatetags.data_helpers import get_dict, parse_json, verbose_name
+
+pytestmark = pytest.mark.django_db
 
 
 def test_get_dict_object():
@@ -24,3 +30,24 @@ def test_get_dict_invalid():
     _foo = 12
 
     assert get_dict(_foo, "bar") is None
+
+
+def test_verbose_name_model():
+    assert verbose_name("core", "person") == "Person"
+
+
+def test_verbose_name_field():
+    assert verbose_name("core", "person", "first_name") == "First Name"
+
+
+def test_parse_json_json():
+    foo = {"foo": 12, "bar": "12", "baz": []}
+    foo_json = json.dumps(foo)
+
+    assert parse_json(foo_json) == foo
+    assert parse_json("{}") == {}
+
+
+def test_parse_json_empty():
+    assert parse_json(None) is None
+    assert parse_json("") is None