testFoldDiffSendsWhatItShows

tcmts.share.testFoldDiffSendsWhatItShows · #zojdzql6 · term

A diff sends what it shows: changes with two lines of context, each line once, the rest counted.

import { foldDiff } from "#codebase/tcmts/share";
import type { ReviewItem } from "#codebase/tcmts/share";
import assert from "node:assert/strict";

export const testFoldDiffSendsWhatItShows = () => {
  const lines: ReviewItem["lines"] = Array.from({ length: 20 }, (_, i) => [" ", `l${i}`]);
  lines.splice(10, 1, ["-", "old"], ["+", "new"]);
  const rows = foldDiff(
    lines,
    lines.map(([, t]) => `<i>${t}</i>`),
  );
  assert.deepEqual(rows[0], { gap: 8 });
  assert.deepEqual(rows.slice(1, 3), [
    { op: " ", a: 9, b: 9, html: "<i>l8</i>" },
    { op: " ", a: 10, b: 10, html: "<i>l9</i>" },
  ]);
  assert.deepEqual(rows.slice(3, 5), [
    { op: "-", a: 11, b: undefined, html: "<i>old</i>" },
    { op: "+", a: undefined, b: 11, html: "<i>new</i>" },
  ]);
  assert.deepEqual(rows.at(-1), { gap: 7 });
  // (a long addition: its first rows, then the rest counted)
  const long = foldDiff(
    Array.from({ length: 50 }, (_, i) => ["+", `x${i}`] as ["+", string]),
    undefined,
    10,
  );
  assert.equal(long.length, 11);
  assert.deepEqual(long.at(-1), { gap: 40, cut: true });
  assert.deepEqual(long[0], { op: "+", a: undefined, b: 1, html: "x0" });
}

testFoldDiffSendsWhatItShows

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