Tests that CSS query string remains intact when added to file.
function testAddCssFileWithQueryString() {
$this
->drupalGet('common-test/query-string');
$query_string = variable_get('css_js_query_string', '0');
$this
->assertRaw(drupal_get_path('module', 'node') . '/node.admin.css?' . $query_string, 'Query string was appended correctly to css.');
$this
->assertRaw(drupal_get_path('module', 'node') . '/node-fake.css?arg1=value1&arg2=value2', 'Query string not escaped on a URI.');
}