test(`Should return correct diff. Type: ${type}. Format: ${format}. Structure: flat.`, () => {
      const expected = fs.readFileSync(path.join(fixturesPath, `expected-${format}.txt`), 'utf-8');
      const config1 = path.join(path1, `before.${type}`);
      const config2 = path.join(path2, `after.${type}`);