test(m2m-fields): add tests that should pass

simple_history/tests/admin.py

@@ -10,6 +10,7 @@
     Document,
     Employee,
     FileModel,
+    Group,
     Paper,
     Person,
     Planet,
@@ -43,6 +44,7 @@ def test_method(self, obj):
     history_list_display = ["title", "test_method"]
 
 
+admin.site.register(Group, SimpleHistoryAdmin)
 admin.site.register(Poll, SimpleHistoryAdmin)
 admin.site.register(Choice, ChoiceAdmin)
 admin.site.register(Person, PersonAdmin)

simple_history/tests/models.py

@@ -145,6 +145,28 @@ class PollWithManyToMany(models.Model):
     history = HistoricalRecords(m2m_fields=[places])
 
 
+class Membership(models.Model):
+    group = models.ForeignKey("Group", on_delete=models.CASCADE)
+    person = models.ForeignKey("Person", on_delete=models.CASCADE)
+    inviter = models.ForeignKey(
+        "Person",
+        on_delete=models.CASCADE,
+        related_name="membership_invites",
+    )
+    invite_reason = models.CharField(max_length=64)
+
+
+class Group(models.Model):
+    name = models.CharField(max_length=128)
+    members = models.ManyToManyField(
+        "Person",
+        through="tests.Membership",
+        through_fields=("group", "person"),
+    )
+
+    history = HistoricalRecords(m2m_fields=[members])
+
+
 class PollWithManyToManyCustomHistoryID(models.Model):
     question = models.CharField(max_length=200)
     pub_date = models.DateTimeField("date published")

simple_history/tests/tests/test_models.py

@@ -68,6 +68,7 @@
     ExternalModelWithAppLabel,
     FileModel,
     ForeignKeyToSelfModel,
+    Group,
     HistoricalChoice,
     HistoricalCustomFKError,
     HistoricalPoll,
@@ -1939,6 +1940,12 @@ def setUp(self):
         self.poll = self.model.objects.create(question="what's up?", pub_date=today)
 
 
+class GroupWithManyToManyThroughFieldsTest(TestCase):
+    def setUp(self):
+        self.model = Group
+        self.history_model = self.model.history.model
+
+
 class ManyToManyTest(TestCase):
     def setUp(self):
         self.model = PollWithManyToMany