Particular embodiments provide a test system that allows the testing of different versions. The test system uses a repository of features that are included in the multiple versions of the application. When new features are added to the application, they may be added to the repository. When a test is performed, an application blueprint is used to build an application model using features from the repository. Then, a test case for the version can be run using the application model. By maintaining the repository of features and then dynamically building the application model for the version of the application, the testing of different versions of the application can be performed.