feat(testing): add test for app > listen (#4971)

* feat(testing): add test for app > listen

* Update test/unit/node/app.test.ts

* refactor: modernize listen fn in app

* wip

* fix: update error message

* fixup: remove console.log

* fixup: use clearAllMocks once in beforeAll

* fix: move chmod after socket listen

* fixup: formatting

* Update src/node/app.ts

Co-authored-by: Jonathan Yu <jonathan@coder.com>

* Update src/node/app.ts

Co-authored-by: Asher <ash@coder.com>

Co-authored-by: Jonathan Yu <jonathan@coder.com>
Co-authored-by: Asher <ash@coder.com>