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

simple_history/tests/models.py

@@ -133,6 +133,15 @@ class PollWithManyToMany(models.Model):
     history = HistoricalRecords(m2m_fields=[places])
 
 
+class PollWithManyToManyThroughFields(models.Model):
+    question = models.CharField(max_length=200)
+    people = models.ManyToManyField(
+        "Place", through="Venue", through_fields=("place", "guest")
+    )
+
+    history = HistoricalRecords(m2m_fields=[people])
+
+
 class PollWithManyToManyCustomHistoryID(models.Model):
     question = models.CharField(max_length=200)
     pub_date = models.DateTimeField("date published")
@@ -312,6 +321,11 @@ class Restaurant(Place):
     updates = HistoricalRecords()
 
 
+class Venue(models.Model):
+    place = models.ForeignKey("Place", on_delete=models.CASCADE, null=True)
+    guest = models.ForeignKey("Person", on_delete=models.CASCADE, null=True)
+
+
 class Person(models.Model):
     name = models.CharField(max_length=100)
 

simple_history/tests/tests/test_models.py

@@ -101,6 +101,7 @@
     PollWithHistoricalIPAddress,
     PollWithManyToMany,
     PollWithManyToManyCustomHistoryID,
+    PollWithManyToManyThroughFields,
     PollWithManyToManyWithIPAddress,
     PollWithNonEditableField,
     PollWithSeveralManyToMany,
@@ -1909,6 +1910,12 @@ def setUp(self):
         self.poll = self.model.objects.create(question="what's up?", pub_date=today)
 
 
+class PollWithManyToManyThroughFieldsTest(TestCase):
+    def setUp(self):
+        self.model = PollWithManyToManyThroughFields
+        self.history_model = self.model.history.model
+
+
 class ManyToManyTest(TestCase):
     def setUp(self):
         self.model = PollWithManyToMany