Function TestWrapForScrollbackCapsEveryLineToWidth

internal/tui/render_test.go:15–23

A prompt echo (or any content line) wider than the terminal must be wrapped before it reaches tea.Println: bubbletea dumps queued Println lines verbatim, so an over-width line soft-wraps in the terminal into rows the renderer never counted, drifting its cursor math and leaving a duplicated prompt fr

(t *testing.T)

// A prompt echo (or any content line) wider than the terminal must be wrapped
// before it reaches tea.Println: bubbletea dumps queued Println lines verbatim,
// so an over-width line soft-wraps in the terminal into rows the renderer never
// counted, drifting its cursor math and leaving a duplicated prompt fragment on
// screen. wrapForScrollback is the guard; every emitted line must fit the width.
func TestWrapForScrollbackCapsEveryLineToWidth(t *testing.T) {
	const width = 80
	longEcho := stylePrompt.Render("▌ ") + styleUser.Render(strings.Repeat("word ", 60))
	for line := range strings.SplitSeq(wrapForScrollback(longEcho, width), "\n") {
		if w := ansi.StringWidth(line); w > width {
			t.Fatalf("wrapped line width %d exceeds terminal width %d: %q", w, width, line)
		}
	}
}