My Emacs configuration https://git.cjennings.net/dotemacs/atom?h=main 2026-04-30T14:13:43+00:00 2026-04-30T14:13:43+00:00 Craig Jennings c@cjennings.net 2026-04-30T13:25:45+00:00 urn:sha1:21d5a737f0278baeafd4d72e59cc9505043d91a9 Four new test files extending the existing test-host-environment.el (which already covered the two battery helpers). - platform-predicates: env-linux-p, env-bsd-p, env-macos-p, env-windows-p walked across every supported system-type value. 8 tests. - display-predicates: env-x-p, env-x11-p, env-wayland-p, env-terminal-p, env-gui-p exercised under every relevant combination of window-system, WAYLAND_DISPLAY, and display-graphic-p. 13 tests. - env-laptop-p: composition over the helpers, with Linux dispatch isolated from non-Linux dispatch via system-type binding. 8 tests including env-desktop-p as the inverse. battery-status-function is forward-declared in this test file (initialized to nil) so cl-letf's symbol-value place can read the prior value without hitting void-variable. - detect-system-timezone: the four-method priority chain. Mocks cj/match-localtime-to-zoneinfo and getenv at the boundary; uses cl-letf on file-exists-p / insert-file-contents to exercise the /etc/timezone fall-through without touching real system files. 5 tests. 34 new tests for host-environment, all passing. Full suite green.