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diff --git a/tests/m2m_regress/tests.py b/tests/m2m_regress/tests.py
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+++ b/tests/m2m_regress/tests.py
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+from __future__ import absolute_import
+
+from django.core.exceptions import FieldError
+from django.test import TestCase
+from django.utils import six
+
+from .models import (SelfRefer, Tag, TagCollection, Entry, SelfReferChild,
+    SelfReferChildSibling, Worksheet, RegressionModelSplit, Line)
+
+
+class M2MRegressionTests(TestCase):
+    def test_multiple_m2m(self):
+        # Multiple m2m references to model must be distinguished when
+        # accessing the relations through an instance attribute.
+
+        s1 = SelfRefer.objects.create(name='s1')
+        s2 = SelfRefer.objects.create(name='s2')
+        s3 = SelfRefer.objects.create(name='s3')
+        s1.references.add(s2)
+        s1.related.add(s3)
+
+        e1 = Entry.objects.create(name='e1')
+        t1 = Tag.objects.create(name='t1')
+        t2 = Tag.objects.create(name='t2')
+
+        e1.topics.add(t1)
+        e1.related.add(t2)
+
+        self.assertQuerysetEqual(s1.references.all(), ["<SelfRefer: s2>"])
+        self.assertQuerysetEqual(s1.related.all(), ["<SelfRefer: s3>"])
+
+        self.assertQuerysetEqual(e1.topics.all(), ["<Tag: t1>"])
+        self.assertQuerysetEqual(e1.related.all(), ["<Tag: t2>"])
+
+    def test_internal_related_name_not_in_error_msg(self):
+        # The secret internal related names for self-referential many-to-many
+        # fields shouldn't appear in the list when an error is made.
+
+        six.assertRaisesRegex(self, FieldError,
+            "Choices are: id, name, references, related, selfreferchild, selfreferchildsibling$",
+            lambda: SelfRefer.objects.filter(porcupine='fred')
+        )
+
+    def test_m2m_inheritance_symmetry(self):
+        # Test to ensure that the relationship between two inherited models
+        # with a self-referential m2m field maintains symmetry
+
+        sr_child = SelfReferChild(name="Hanna")
+        sr_child.save()
+
+        sr_sibling = SelfReferChildSibling(name="Beth")
+        sr_sibling.save()
+        sr_child.related.add(sr_sibling)
+
+        self.assertQuerysetEqual(sr_child.related.all(), ["<SelfRefer: Beth>"])
+        self.assertQuerysetEqual(sr_sibling.related.all(), ["<SelfRefer: Hanna>"])
+
+    def test_m2m_pk_field_type(self):
+        # Regression for #11311 - The primary key for models in a m2m relation
+        # doesn't have to be an AutoField
+
+        w = Worksheet(id='abc')
+        w.save()
+        w.delete()
+
+    def test_add_m2m_with_base_class(self):
+        # Regression for #11956 -- You can add an object to a m2m with the
+        # base class without causing integrity errors
+
+        t1 = Tag.objects.create(name='t1')
+        t2 = Tag.objects.create(name='t2')
+
+        c1 = TagCollection.objects.create(name='c1')
+        c1.tags = [t1, t2]
+        c1 = TagCollection.objects.get(name='c1')
+
+        self.assertQuerysetEqual(c1.tags.all(), ["<Tag: t1>", "<Tag: t2>"], ordered=False)
+        self.assertQuerysetEqual(t1.tag_collections.all(), ["<TagCollection: c1>"])
+
+    def test_manager_class_caching(self):
+        e1 = Entry.objects.create()
+        e2 = Entry.objects.create()
+        t1 = Tag.objects.create()
+        t2 = Tag.objects.create()
+
+        # Get same manager twice in a row:
+        self.assertTrue(t1.entry_set.__class__ is t1.entry_set.__class__)
+        self.assertTrue(e1.topics.__class__ is e1.topics.__class__)
+
+        # Get same manager for different instances
+        self.assertTrue(e1.topics.__class__ is e2.topics.__class__)
+        self.assertTrue(t1.entry_set.__class__ is t2.entry_set.__class__)
+
+    def test_m2m_abstract_split(self):
+        # Regression for #19236 - an abstract class with a 'split' method
+        # causes a TypeError in add_lazy_relation
+        m1 = RegressionModelSplit(name='1')
+        m1.save()
+
+    def test_m2m_filter(self):
+        worksheet = Worksheet.objects.create(id=1)
+        line_hi = Line.objects.create(name="hi")
+        line_bye = Line.objects.create(name="bye")
+
+        worksheet.lines = [line_hi, line_bye]
+        hi = worksheet.lines.filter(name="hi")
+
+        worksheet.lines = hi
+        self.assertEqual(1, worksheet.lines.count())
+        self.assertEqual(1, hi.count())
+