Test runner's --test-rerun-failures could swallow actual failures on retries #63424

// Demonstrates that `node --test --test-rerun-failures` can mark a failing test as passing on retry without executing its body.
// Root cause: the runtime disambiguator at lib/internal/test_runner/test.js:793-801 keys tests purely by `file:line:column`.
// A `t.test()` registered inside a factory function gets the same source location regardless of which parent invoked the factory.
// The disambiguator counter is assigned in execution order across the whole run, so on retry - when the set of running tests changes,
// the surviving failing test inherits a counter slot that, in attempt 0, belonged to a different (passing) sibling.
// Node matches by that slot, replaces `this.fn` with a synthetic noop replay, and reports the failure as a pass.

import { describe, it } from 'node:test';
import { strict as assert } from 'node:assert';

function makeSuite(shouldPass, label) {
  return async (t) => {
    await t.test('inner', async () => {
      if (!shouldPass) assert.fail(`${label} should fail`);
    });
  };
}

describe('parents', { concurrency: false }, () => {
  it('A passes', makeSuite(true,  'A'));
  it('B fails',  makeSuite(false, 'B'));   // the only real failure
  it('C passes', makeSuite(true,  'C'));
});