For the `single sim tests` and `multiple sim tests` `suite`, how do you think we do the below things?
```
suite('sim', function() {
  suite('single sim', function() {
    setup(function() {
      // Load the mock object.
    });

    test('xxx', function() {});
  });

  suite('multiple sim', function() {
    setup(function() {
      // Load the mock object.
    });

    test('xxx', function() {});
  });
});
```