Introduce `TestAppContext`

Co-Authored-By: Max <max@zed.dev>
Co-Authored-By: Conrad Irwin <conrad.irwin@gmail.com>
Co-Authored-By: Kyle Caverly <kyle@zed.dev>
92535ba2c4Antonio Scandurra committed on 10/25/2023, 3:55:20 PMparent6f6495c
2 files changedLine totals unavailable