test(settings): History Entry checks for External Link model

ref: #605 closes #635

app/settings/tests/functional/external_links/test_functional_external_links_history.py

@@ -0,0 +1,34 @@
+from django.test import TestCase
+
+from core.tests.abstract.test_functional_history import HistoryEntriesCommon
+
+from settings.models.external_link_history import ExternalLink, ExternalLinkHistory
+
+
+
+class History(
+    HistoryEntriesCommon,
+    TestCase,
+):
+
+    model = ExternalLink
+
+    history_model = ExternalLinkHistory
+
+
+    @classmethod
+    def setUpTestData(self):
+
+        super().setUpTestData()
+
+        self.obj = self.model.objects.create(
+            organization = self.organization,
+            name = self.field_value_original
+        )
+
+        self.obj_delete = self.model.objects.create(
+            organization = self.organization,
+            name = self.field_value_delete
+        )
+
+        self.call_the_banners()