Can't enable modules

It should work completely the same. You should be able to enable modules passing arguments to setUp().

Implementation of the setUp() method for DrupalSeleniumWebTestCase is

protected function setUp() {
$modules = func_get_args();
parent::setUp($modules);
//...
}
So everything passed to it is passed to parent setUp method that should enable modules for you.

Please let me know if it doesn't work and give me example so I can reproduce the problem.

In D6, DrupalWebTestCase::setUp used a variable-length argument list as modules list. In D7, it supports both a variable-length argument list or an array as first argument. The array as first argument is the recommended way of using it and the variable-length argument list support will be removed in D8.

DrupalSeleniumWebTestCase::setUp call parent::setUp(func_get_args()) and thus only support the old deprecated Drupal 6 way of enabling module in a SimpleTest class.

Closed as a duplicate of #1876120: Fix setUp: let it get modules list as a single array, since that one has a patch.

tried on fresh install