add test for excluded relationship

tests/test_column_inclusion_and_exclusion.py

@@ -53,3 +53,52 @@ class TextItem(self.Model):
             content = sa.Column('_content', sa.UnicodeText)
 
         self.TextItem = TextItem
+
+
+class TestColumnExclusionWithRelationship(TestCase):
+    def create_models(self):
+
+        class Word(self.Model):
+            __tablename__ = 'word'
+            id = sa.Column(sa.Integer, autoincrement=True, primary_key=True)
+            word = sa.Column(sa.Unicode(255))
+
+        class TextItemWord(self.Model):
+            __tablename__ = 'text_item_word'
+            id = sa.Column(sa.Integer, autoincrement=True, primary_key=True)
+            text_item_id = sa.Column(sa.Integer, sa.ForeignKey('text_item.id'), nullable=False)
+            word_id = sa.Column(sa.Integer, sa.ForeignKey('word.id'), nullable=False)
+
+        class TextItem(self.Model):
+            __tablename__ = 'text_item'
+            __versioned__ = {
+                'exclude': ['content']
+            }
+
+            id = sa.Column(sa.Integer, autoincrement=True, primary_key=True)
+            name = sa.Column(sa.Unicode(255))
+            content = sa.orm.relationship(Word, secondary='text_item_word')
+
+        self.TextItem = TextItem
+        self.Word = Word
+
+    def test_excluded_columns_not_included_in_version_class(self):
+        cls = version_class(self.TextItem)
+        manager = cls._sa_class_manager
+        assert 'content' not in manager.keys()
+
+    def test_versioning_with_column_exclusion(self):
+        item = self.TextItem(name=u'Some textitem',
+                             content=[self.Word(word=u'bird')])
+        self.session.add(item)
+        self.session.commit()
+
+        assert item.versions[0].name == u'Some textitem'
+
+    def test_does_not_create_record_if_only_excluded_column_updated(self):
+        item = self.TextItem(name=u'Some textitem')
+        self.session.add(item)
+        self.session.commit()
+        item.content.append(self.Word(word=u'Some content'))
+        self.session.commit()
+        assert item.versions.count() == 1