Function setupDuplicates

packages/jest-haste-map/src/__tests__/index.test.js:1671–1718

(hm)

    describe('recovery from duplicate module IDs', () => {
      async function setupDuplicates(hm) {
        mockFs[path.join('/', 'project', 'fruits', 'Pear.js')] = `
          // Pear!
        `;
        mockFs[path.join('/', 'project', 'fruits', 'another', 'Pear.js')] = `
          // Pear too!
        `;
        const e = mockEmitters[path.join('/', 'project', 'fruits')];
        e.emit(
          'all',
          'change',
          'Pear.js',
          path.join('/', 'project', 'fruits'),
          MOCK_STAT_FILE,
        );
        e.emit(
          'all',
          'add',
          'Pear.js',
          path.join('/', 'project', 'fruits', 'another'),
          MOCK_STAT_FILE,
        );
        const {hasteFS, moduleMap} = await waitForItToChange(hm);
        expect(
          hasteFS.exists(
            path.join('/', 'project', 'fruits', 'another', 'Pear.js'),
          ),
        ).toBe(true);
        try {
          moduleMap.getModule('Pear');
          throw new Error('should be unreachable');
        } catch (error) {
          const {DuplicateHasteCandidatesError} =
            require('../ModuleMap').default;
          expect(error).toBeInstanceOf(DuplicateHasteCandidatesError);
          expect(error.hasteName).toBe('Pear');
          expect(error.platform).toBe('g');
          expect(error.supportsNativePlatform).toBe(false);
          expect(error.duplicatesSet).toEqual(
            createMap({
              [path.join('/', 'project', 'fruits', 'Pear.js')]: H.MODULE,
              [path.join('/', 'project', 'fruits', 'another', 'Pear.js')]:
                H.MODULE,
            }),
          );
          expect(error.message.replaceAll('\\', '/')).toMatchSnapshot();
        }
      }

      hm_it(
        'recovers when the oldest version of the duplicates is fixed',