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test(web): cover the spacer-write and dead-lead spacer branches

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imccyu
2026-07-29 19:38:43 +08:00
parent dffb5c888f
commit c54bbc0f7e
1 changed files with 15 additions and 0 deletions
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15
packages/client/ui-primitives/tests/ansi.spec.ts
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@@ -448,6 +448,21 @@ describe('parseAnsiLines: bounded state and true widths', () => {
expect(onlySpan(`\u4e2dx${ESC}[1K|`)).toEqual({ text: ' |', style: undefined }) expect(onlySpan(`\u4e2dx${ESC}[1K|`)).toEqual({ text: ' |', style: undefined })
}) })
it('clears the lead when the write lands on the spacer itself', () => {
// Two backspaces from after `中x` stop ON the wide glyph's second cell;
// writing there blanks the lead through the spacer side of the pair clear,
// so the glyph cannot survive as half a character.
expect(onlySpan(`中x${BS}${BS}A`)).toEqual({ text: ' Ax', style: undefined })
})
it('keeps a surviving spacer as a blank when its lead was replaced by a spacer', () => {
// `好` written over the first glyph's spacer puts its own spacer on the
// second glyph's lead cell — a write that goes down without a pair clear.
// The second glyph's spacer survives with a dead lead and must emit a
// blank, or everything after it shifts one column left.
expect(onlySpan(`中中${BS}${BS}${BS}好`)).toEqual({ text: ' 好 ', style: undefined })
})
it('blanks both halves of a wide pair when either is overwritten', () => { it('blanks both halves of a wide pair when either is overwritten', () => {
// A terminal cannot leave one cell of a two-cell glyph standing, so writing // A terminal cannot leave one cell of a two-cell glyph standing, so writing
// over the spacer clears the lead as well. // over the spacer clears the lead as well.