flake: add Flake Parts tree into testbed environment

[trueNAHO]

commit 326a51f3501e9d5a96afa72d39db437742f7cd89
Author: NAHO <[email protected]>
Date:   2025-07-08 19:38:21 +0200

    flake: add Flake Parts tree into testbed environment

    Add the Flake Parts tree into the testbed environment, enabling
    realistic testing interactions.

    Flake Parts is chosen over Stylix to reduce cache invalidations, and
    over other flake inputs as the smallest tree.

 stylix/testbed/default.nix             | 1 +
 stylix/testbed/modules/flake-parts.nix | 7 +++++++
 2 files changed, 8 insertions(+)

commit c154a1b51a1a90ae09eebe30068c27bdadfe5b40
Author: NAHO <[email protected]>
Date:   2025-07-08 19:41:02 +0200

    treewide: replace custom testbed test files with Flake Parts tree

 modules/bat/testbeds/bat.nix       | 12 +-----------
 modules/micro/testbeds/micro.nix   |  8 +-------
 modules/neovim/testbeds/neovim.nix | 10 ++--------
 modules/neovim/testbeds/nixvim.nix | 12 +-----------
 modules/neovim/testbeds/nvf.nix    | 12 +-----------
 modules/neovim/testbeds/vim.nix    |  8 +-------
 modules/zed/testbeds/zed.nix       |  8 +-------
 7 files changed, 8 insertions(+), 62 deletions(-)

commit 2dcb2c918e878575d4c87e9236aadd49fccfabb2
Author: NAHO <[email protected]>
Date:   2025-07-11 15:19:21 +0200

    treewide: expand testbed interactions with Flake Parts tree

 modules/emacs/testbeds/emacs.nix                         | 10 ++--------
 modules/gedit/testbeds/gedit.nix                         | 11 ++---------
 modules/gnome-text-editor/testbeds/gnome-text-editor.nix | 11 ++---------
 modules/neovim/testbeds/neovide.nix                      | 10 ++--------
 modules/vscode/testbeds/vscode.nix                       | 13 ++++---------
 5 files changed, 12 insertions(+), 43 deletions(-)

Things done

• Tested locally
• Tested in testbed
• Commit message follows commit convention
• Fits style guide
• Respects license of any existing code used

Notify maintainers

[awwpotato]

LGTM

[trueNAHO]

Note that all touched testbeds can be run in parallel with:

git diff --stat master.. modules |
  head --lines -1 |
  sed --regexp-extended 's/.*\/([^/]+)\.nix.*/\1/' |
  parallel --bar --color --color-failed --tagstring '{}' nix run .#testbed:{}:dark

From my testing, all testbeds behave correctly, except for Emacs, VSCode, and Zed.

[trueNAHO]

The testbed does not seem to have any color scheme when opening the file:

nix run github:trueNAHO/stylix/flake-add-flake-parts-tree-into-testbed-environment#testbed:emacs:dark

If manual intervention is required, /modules/emacs/meta.nix's description attribute should be added.

---

CC: @panchoh

[trueNAHO]

The testbed does not seem to have any color scheme when opening the file:

nix run github:trueNAHO/stylix/flake-add-flake-parts-tree-into-testbed-environment#testbed:vscode:dark

Note that it takes a very long time for codium to start...

---

CC: @Flameopathic @danth

[trueNAHO]

The testbed does not seem to have any color scheme when opening the file:

nix run github:trueNAHO/stylix/flake-add-flake-parts-tree-into-testbed-environment#testbed:zed:dark

Also, the pop-up notification is rather annoying.