2 files changed, 63 insertions, 0 deletions
diff --git a/test/macos-snapshots/opacity.golden b/test/macos-snapshots/opacity.golden
new file mode 100644
index 00000000..b28c6e0c
--- /dev/null
+++ b/test/macos-snapshots/opacity.golden
@@ -0,0 +1,29 @@
+== draw-opacity solid 680x396 alpha 255..255
+== snap translucent grid=80x24 cursor=4,3
+|Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|   New Tty Find Grep Joincol
+|$  /private/tmp/pardes-macos-e2e/opacity/cwd Tty Save Del Mode Filter Collapse
+|  $
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+|
+== draw-opacity translucent 680x396 alpha 153..255
+== draw-opacity clear 680x396 alpha 0..255
+== draw-opacity restored 680x396 alpha 255..255
diff --git a/test/macos-snapshots/opacity.snap b/test/macos-snapshots/opacity.snap
new file mode 100644
index 00000000..0f73cb17
--- /dev/null
+++ b/test/macos-snapshots/opacity.snap
@@ -0,0 +1,34 @@
+# WindowOpacity, end to end: the builtin the core only offers to a shell that
+# declared the capability (src/builtins.zig), through pardes_window_opacity,
+# to the alpha CoreGraphics actually left in the framebuffer.
+#
+# The contract is two-sided and shaders/ui.frag.glsl states it for the SDL
+# shell: BACKGROUNDS take the percentage, glyph ink never does. `draw-opacity`
+# records both ends of the range so a regression that made the whole window
+# translucent — text included — reads as a changed maximum, not as a pass.
+start 24 80
+wait 8000 Newcol Joincol
+wait 8000 $
+stable 700 20000
+
+# Opaque is the default, and an opaque view caches without an alpha channel
+# at all.
+draw-opacity solid
+
+# Backgrounds drop to 60%; the prompt and the chrome text stay at 255.
+command WindowOpacity 60
+stable 700 20000
+snap translucent
+draw-opacity translucent
+
+# 0 is the extreme the block cursor exists to survive: every background is
+# gone and the ink is still there.
+command WindowOpacity 0
+stable 700 20000
+draw-opacity clear
+
+# ...and back, which must restore an opaque view rather than leave a window
+# that is merely painting 100% alpha into a transparent surface.
+command WindowOpacity 100
+stable 700 20000
+draw-opacity restored