initial

tests/testdata/models.py

@@ -0,0 +1,29 @@
+from django.contrib.auth.base_user import AbstractBaseUser
+from django.contrib.auth.models import AbstractUser
+from django.db import models
+
+
+class CustomUser(AbstractUser):
+    some_field = models.IntegerField(default=0)
+
+    custom_groups = models.ManyToManyField(
+        "CustomGroup",
+        verbose_name="groups",
+        blank=True,
+        help_text=(
+            "The groups this user belongs to. A user will get all permissions "
+            "granted to each of their groups."
+        ),
+        related_name="user_set",
+        related_query_name="user",
+    )
+
+
+class CustomGroup(models.Model):
+    pass
+
+
+# user with invalid renamed identifier, and no email field
+class VeryCustomUser(AbstractBaseUser):
+    identifier = models.IntegerField()
+    USERNAME_FIELD = "identifier"