public function testIsScopeActive() {
$c = new Container();
$this
->assertFalse($c
->isScopeActive('foo'));
$c
->addScope(new Scope('foo'));
$this
->assertFalse($c
->isScopeActive('foo'));
$c
->enterScope('foo');
$this
->assertTrue($c
->isScopeActive('foo'));
$c
->leaveScope('foo');
$this
->assertFalse($c
->isScopeActive('foo'));
}