This is very confusing as seen in #12974 or #12906. My suggestion would be "legacy."
process.env.TZ = "UTC";
  done();
});
gulp.task(
  "test",
  gulp.series("testing-pre", "generic", "components", function () {
    return streamqueue(
      { objectMode: true },
      createTestSource("unit"),
      createTestSource("browser"),
      createTestSource("integration")
    );
  })
);
gulp.task(
  "bottest",
  gulp.series("testing-pre", "generic", "components", function () {
    return streamqueue(
      { objectMode: true },
      createTestSource("unit", true),
      createTestSource("font", true),
      createTestSource("browser (no reftest)", true),
      createTestSource("integration")
    );
  })
);
gulp.task(