Chapter 7

1. The testing of a complete system from end to end. This can be performed manually, automatically, or by using both methods.
2. Integration testing.
3. Manual testing of all features, all our unit tests should pass, and we should write automation tests to test the commands and data that are passed between two modules.
4. Factories are classes that implement the factory method pattern whose intention is to allow the creation of objects without specifying their classes. We would use them in the following scenarios:
   1. The class is unable to anticipate the type of object that must be instantiated.
   2. The subclass must specify the type of object to instantiate.
   3. The class controls the instantiation of its objects.
5. DI is a method of producing loosely coupled code that is easy to maintain and extend.
6. Using a container makes the management of dependency objects easy.