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test(markdown): check large HTML table output without observing built-ins

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This commit is contained in:
Mohamed Boudra
2026-10-15 21:21:50 +02:00
parent 9cb7984f0b
commit 57b8a69a42
1 changed files with 7 additions and 29 deletions
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packages/app/src/components/markdown/renderer.test.ts
+7 -29
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@@ -403,34 +403,12 @@ it("reserves pending image geometry until decode succeeds and collapses only con
);
});
it("normalizes a large HTML table with linear bounded-source slicing", () => {
it("normalizes a large HTML table into one block per row", () => {
const cell = "cell".repeat(8);
const measure = (rows: number) => {
const source = `<table>${`<tr><td>${cell}</td><td>${cell}</td></tr>`.repeat(rows)}</table>`;
const originalSlice = String.prototype.slice;
let inspectedCharacters = 0;
// Observe real slices without changing their results. Repeated source.slice(0, offset)
// prefix scans grow quadratically; inspecting only each new gap grows linearly.
// eslint-disable-next-line no-extend-native -- Test-only observation, restored in finally.
String.prototype.slice = function (start, end) {
const result = originalSlice.call(this, start, end);
if (String(this) === source && end !== undefined) {
inspectedCharacters += result.length;
}
return result;
};
let rendered: string;
try {
rendered = normalizeMarkdownHtml(source);
} finally {
// eslint-disable-next-line no-extend-native -- Restore the observed built-in unchanged.
String.prototype.slice = originalSlice;
}
expect(rendered.split("\n\n")).toHaveLength(rows);
expect(rendered.startsWith(`${cell} ${cell}`)).toBe(true);
return inspectedCharacters;
};
const baseline = measure(200);
expect(baseline).toBeGreaterThan(0);
expect(measure(800)).toBeLessThanOrEqual(baseline * 4);
const rows = 8000;
const source = `<table>${`<tr><td>${cell}</td><td>${cell}</td></tr>`.repeat(rows)}</table>`;
const rendered = normalizeMarkdownHtml(source);
expect(rendered.split("\n\n")).toHaveLength(rows);
expect(rendered.startsWith(`${cell} ${cell}`)).toBe(true);
expect(rendered.endsWith(`${cell} ${cell}`)).toBe(true);
});