Ensures that the module provided theme engine is found and used by core.
function testEngineIsFoundAndWorking() {
variable_set('theme_default', 'test_theme_nyan_cat');
variable_set('admin_theme', 'test_theme_nyan_cat');
$this
->drupalGet('theme-test/engine-info-test');
$this
->assertText('Miaou');
}