| Command |
| CommandLoader |
| DependencyInjection |
| Descriptor |
| EventListener |
| Fixtures |
| Formatter |
| Helper |
| Input |
| Logger |
| Output |
| Style |
| Tester |
| ApplicationTest | |
| CustomApplication | An Application is the container for a collection of commands. |
| CustomDefaultCommandApplication | An Application is the container for a collection of commands. |
| DisabledCommand | Base class for all commands. |
| LazyCommand | Base class for all commands. |
| TerminalTest |