32e5b24c

scenarios: make blink-bar fixture render visible content

a73x 2026-04-19 14:05

Commit message

scenarios: make blink-bar fixture render visible content

Previous fixture wrote only DECSCUSR 5 (cursor shape change)
against an empty terminal. Both goldens were technically
distinct (cursor-on vs cursor-off) but visually near-blank
— 2px of cursor against 800x480 of black.

New fixture writes a demo banner + prompt BEFORE setting
cursor shape, so both goldens show identifiable content.
The cursor column remains the only pixel difference between
frames; the mutation-detection pipeline still works.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/scenarios/blink-bar.scenario

Old		New
@@ -1,14 +1,28 @@
1	# Blinking bar cursor: DECSCUSR 5 then observe two phases.	1	# Blinking bar cursor over visible content.
		2	#
		3	# Writes a demo banner + a prompt-like line, then switches cursor
		4	# shape to blinking bar and captures two frames 500ms apart. The
		5	# cursor column is the only pixel difference between frames, but
		6	# both frames show identifiable content so a human can tell what
		7	# was captured.
2	size 80 24	8	size 80 24
3	timeout 5000ms	9	timeout 5000ms
4		10
5	# Inject DECSCUSR 5 directly (no shell) - blinking bar.	11	# Banner line + newline.
6	bytes "\e[5 q"	12	bytes "=== waystty scenario runner demo ===\r\n"
		13	# Prompt-like line — cursor will sit at column 2 after this.
		14	bytes "$ "
7		15
8	# Give blink state machine time to arm.	16	# Settle.
9	sleep 100ms	17	sleep 100ms
		18
		19	# Switch to blinking bar cursor (DECSCUSR 5).
		20	bytes "\e[5 q"
		21	sleep 100ms
		22
		23	# Arm check: cursor should be on now (first phase of 500ms arm).
10	capture before-flip	24	capture before-flip
11		25
12	# Advance past the first phase flip (500ms period).	26	# Advance past the first phase flip.
13	sleep 500ms	27	sleep 500ms
14	capture after-flip	28	capture after-flip

tests/scenarios/golden/blink-bar/after-flip.png

Old		New
Binary file
	Binary files differ

tests/scenarios/golden/blink-bar/before-flip.png

Old		New
Binary file
	Binary files differ