fix bug when initializing CheckConstraint

migrate/changeset/constraint.py

@@ -147,7 +147,6 @@ class CheckConstraint(ConstraintChangeset, schema.CheckConstraint):
                 'parameter or "columns" to autogenarate it.')
         colnames, table = self._normalize_columns(cols)
         table = kwargs.pop('table', table)
-        ConstraintChangeset.__init__(self, *args, **kwargs)
         schema.CheckConstraint.__init__(self, sqltext, *args, **kwargs)
         if table is not None:
             self.table = table

setup.cfg

@@ -7,9 +7,9 @@ tag_svn_revision = 1
 tag_build = .dev
 
 [nosetests]
-pdb = true
-pdb-failures = true
-stop = true
+#pdb = true
+#pdb-failures = true
+#stop = true
 
 [aliases]
 release = egg_info -RDb ''

test/changeset/test_constraint.py

@@ -146,8 +146,7 @@ class TestConstraint(CommonTestConstraint):
     @fixture.usedb(not_supported=['sqlite', 'mysql'])
     def test_named_check_constraints(self):
         """Check constraints can be defined, created, and dropped"""
-        self.assertRaises(InvalidConstraintError,
-                          CheckConstraint, 'id > 3')
+        self.assertRaises(InvalidConstraintError, CheckConstraint, 'id > 3')
         cons = CheckConstraint('id > 3', name="id_check", table=self.table)
         cons.create()
         self.refresh_table()