function test_session_data()
{
$module = new DummyModule();
// Check if session array is altered
$old_count = count($_SESSION);
$this->assertNull($module->get_session_data('foo'));
$module->set_session_data('foo', 'bar');
$this->assertEqual($module->get_session_data('foo'), 'bar');
$this->assertEqual(count($_SESSION), $old_count + 1);
// Session data is module-specific
$module2 = new Module('different');
$this->assertNull($module2->get_session_data('foo'));
$module2->set_session_data('foo', 'notbar');
$this->assertEqual($module2->get_session_data('foo'), 'notbar');
$module2->set_session_data('foo');
// Can remove from session
$module->set_session_data('foo');
$this->assertNull($module->get_session_data('foo'));
$this->assertEqual(count($_SESSION), $old_count);
}
