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| author | Craig Jennings <c@cjennings.net> | 2026-06-15 23:29:35 -0500 |
|---|---|---|
| committer | Craig Jennings <c@cjennings.net> | 2026-06-15 23:29:35 -0500 |
| commit | c0c6e72684387f990fda1096e842f1f100ddb3e5 (patch) | |
| tree | c5a310db35ffb543df2773d3c239642b15bfe3d2 /tests/test-system-utils-scratch-background.el | |
| parent | 07738d4f58f463c20ab70b5f336b2911f5f9d521 (diff) | |
| download | dotemacs-c0c6e72684387f990fda1096e842f1f100ddb3e5.tar.gz dotemacs-c0c6e72684387f990fda1096e842f1f100ddb3e5.zip | |
feat(system-utils): tint the *scratch* background a shade lighter
A buffer-local face remap lightens the *scratch* default background by cj/scratch-background-lighten percent (default 5) so it reads as the scratch buffer, applied on emacs-startup-hook. The colour math is display-dependent (verified live); the pure helper's guard contract is unit-tested.
Diffstat (limited to 'tests/test-system-utils-scratch-background.el')
| -rw-r--r-- | tests/test-system-utils-scratch-background.el | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tests/test-system-utils-scratch-background.el b/tests/test-system-utils-scratch-background.el new file mode 100644 index 000000000..422590f4b --- /dev/null +++ b/tests/test-system-utils-scratch-background.el @@ -0,0 +1,30 @@ +;;; test-system-utils-scratch-background.el --- Tests for the scratch tint -*- lexical-binding: t; -*- + +;;; Commentary: +;; cj/--scratch-lightened-background lightens the default background by a +;; tunable percent for the *scratch* buffer's buffer-local face remap. The +;; colour arithmetic (color-lighten-name -> color-name-to-rgb) is +;; display-dependent and returns zeros under --batch, so the actual lightening +;; is verified live in the daemon; here we cover the display-independent +;; contract: a usable colour string yields a string, junk yields nil. + +;;; Code: + +(require 'ert) +(require 'color) +(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory)) +(require 'system-utils) + +(ert-deftest test-system-utils-scratch-lightened-background-returns-string () + "Normal: a valid hex colour yields a colour string (not nil)." + (let ((cj/scratch-background-lighten 5)) + (should (stringp (cj/--scratch-lightened-background "#100f0f"))))) + +(ert-deftest test-system-utils-scratch-lightened-background-bad-input () + "Error: non-colour input yields nil rather than signalling." + (should (null (cj/--scratch-lightened-background nil))) + (should (null (cj/--scratch-lightened-background 'unspecified))) + (should (null (cj/--scratch-lightened-background "not-a-color")))) + +(provide 'test-system-utils-scratch-background) +;;; test-system-utils-scratch-background.el ends here |