From 32329d9a384642dd231ed1f5a16aa6c85b8d0ef0 Mon Sep 17 00:00:00 2001
From: cashmere <cashmere@autistici.org>
Date: Sat, 12 Sep 2026 00:30:11 +0200
Subject: relic: 2026-09-12T00:30:15+02:00

---
 test/fossil-ui-test.el | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

(limited to 'test')

diff --git a/test/fossil-ui-test.el b/test/fossil-ui-test.el
index 6b61bd9..081a701 100644
--- a/test/fossil-ui-test.el
+++ b/test/fossil-ui-test.el
@@ -231,6 +231,62 @@
     (should-not (string-search (string ?\e) rendered))
     (should (text-property-not-all 0 (length rendered) 'face nil rendered))))
 
+(ert-deftest fossil-ui-delta-color-mode-follows-frame-background ()
+  (let ((fossil-ui-delta-color-mode 'auto)
+        (fossil-ui-delta-arguments '("--paging=never" "--color-only")))
+    (cl-letf (((symbol-function 'frame-parameter)
+               (lambda (_frame parameter)
+                 (and (eq parameter 'background-mode) 'light))))
+      (should (equal (fossil-ui--effective-delta-arguments)
+                     '("--light" "--paging=never" "--color-only"))))
+    (cl-letf (((symbol-function 'frame-parameter)
+               (lambda (_frame parameter)
+                 (and (eq parameter 'background-mode) 'dark))))
+      (should (equal (fossil-ui--effective-delta-arguments)
+                     '("--dark" "--paging=never" "--color-only"))))))
+
+(ert-deftest fossil-ui-delta-color-mode-respects-explicit-arguments ()
+  (let ((fossil-ui-delta-color-mode 'auto))
+    (dolist (arguments '(("--light" "--color-only")
+                         ("--dark" "--color-only")
+                         ("--syntax-theme" "GitHub" "--color-only")
+                         ("--syntax-theme=GitHub" "--color-only")))
+      (let ((fossil-ui-delta-arguments arguments))
+        (should (eq (fossil-ui--effective-delta-arguments) arguments))))))
+
+(ert-deftest fossil-ui-theme-change-rerenders-open-diff-in-place ()
+  (save-window-excursion
+    (with-temp-buffer
+      (let* ((buffer (current-buffer))
+             (raw (mapconcat (lambda (number) (format "line %d" number)) (number-sequence 1 80) "\n"))
+             (context (list :root "/tmp/project/" :path "example.el" :diff raw)))
+        (fossil-ui-diff-mode)
+        (let ((inhibit-read-only t))
+          (insert raw))
+        (set-buffer-modified-p nil)
+        (setq-local fossil-ui-diff-context context)
+        (switch-to-buffer buffer)
+        (goto-char (point-min))
+        (forward-line 40)
+        (let ((point-before (point))
+              (window-before (selected-window)))
+          (set-window-start window-before (save-excursion
+                                            (goto-char (point-min))
+                                            (forward-line 20)
+                                            (point)))
+          (let ((start-before (window-start window-before)))
+            (cl-letf (((symbol-function 'fossil-ui--display-diff)
+                       (lambda (_diff &optional _frame)
+                         (propertize raw 'face 'success))))
+              (fossil-ui--theme-enabled 'test-theme))
+            (should (eq (selected-window) window-before))
+            (should (= (point) point-before))
+            (should (= (window-start window-before) start-before))
+            (should-not (buffer-modified-p))
+            (should (equal fossil-ui-diff-context context))
+            (should (equal (buffer-substring-no-properties (point-min) (point-max)) raw))
+            (should (eq (get-text-property (point-min) 'face) 'success))))))))
+
 (ert-deftest fossil-ui-status-opens-rendered-dashboard ()
   (fossil-ui-test--with-checkout
     (fossil-ui-test--write (expand-file-name "tracked.txt" root) "changed content\n")
-- 
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