Test Data Builder Pattern
Download as PPTX, PDF5 likes1,832 views
The document discusses the test data builder pattern for generating test data on demand instead of dropping and reloading a database, which is considered an anti-pattern. It introduces a user builder class that simplifies the construction of complex objects with sensible default values. The text emphasizes the benefits of abstracting data construction complexity and poses questions about implementing this pattern.
Test Data Builder Pattern
- 1. Test Data Builder Pattern Alan Parkinson CEO, Hindsight Software @alan_parkinson
- 2. Tests Application Under Test Application Database Mobile App Server Drop and reload the database before every test
- 3. Who has done this?
- 4. Database reloading is an Anti Pattern Creating and maintaining SQL scripts is error prone and time consuming
- 6. Tests Application Under Test Application Database What if we could generate test data on demand?
- 7. Create test data on- demand with the Test Data Builder Pattern
- 8. What is a Builder? new UserBuilder() an object that knows how to construct another object User user = .build();
- 9. the object is complex to construct public class UserBuilder { uses sensible default values } public User build() { return new User(name, password, email); } private String name = ``charlie``; private String password = ``password``; private String email = ``charlie@behave.pro``;
- 10. Overriding sensible defaults new UserBuilder()user = .build(); .withName(``alan ``).withPassword(``secr et``)
- 11. Overriding sensible defaults public class UserBuilder { } public User build() { return new User(name, password, email); } private String name = ``charlie``; private String password = ``password``; private String email = ``charlie@behave.pro``; public UserBuilder withName(String name) { this.name = name; return this; }
- 12. What about the Test Data? create remote data instead of an object
- 13. public class UserBuilder { } public UserDesc build() { /* Create data using SQL / REST API / UI? */ return new UserDesc(createdUserId); } private String name = ``charlie``; private String password = ``password``; private String email = ``charlie@behave.pro``; public UserBuilder withName(String name) { this.name = name; return this; }
- 14. Don`t drop and reload the database Generate and construct Test Data on-demand Abstract data contruction complexity with the Builder Pattern
- 15. Questions? Alan Parkinson CEO, Hindsight Software @alan_parkinson