Fix small typo on error message

test/integration/model/create.test.js

@@ -99,7 +99,7 @@ describe(Support.getTestDialectTeaser('Model'), function() {
             username: 'gottlieb'
           }
         }).then(function () {
-          throw new Error('I should have ben rejected');
+          throw new Error('I should have been rejected');
         }, function (err) {
           expect(err instanceof Sequelize.UniqueConstraintError).to.be.ok;
           expect(err.fields).to.be.ok;