move to external pytest plugin

test/test-data/postgres-fields.test

@@ -0,0 +1,21 @@
+[CASE array_field_descriptor_access]
+from django.db import models
+from django.contrib.postgres.fields import ArrayField
+
+class User(models.Model):
+    array = ArrayField(base_field=models.Field())
+
+user = User()
+reveal_type(user.array)  # E: Revealed type is 'builtins.list[Any]'
+
+[CASE array_field_base_field_parsed_into_generic_typevar]
+from django.db import models
+from django.contrib.postgres.fields import ArrayField
+
+class User(models.Model):
+    members = ArrayField(base_field=models.IntegerField())
+    members_as_text = ArrayField(base_field=models.CharField(max_length=255))
+
+user = User()
+reveal_type(user.members)  # E: Revealed type is 'builtins.list[builtins.int*]'
+reveal_type(user.members_as_text)  # E: Revealed type is 'builtins.list[builtins.str*]'