kinda ugly

AssetCollectorTest.php

    <?php
    try {
      $this->collector->setDefaults('css', array('foo' => 'bar'));
      $this->fail('No exception thrown exception when an attempt was made to change protected values while the collector was locked.');
    }
    catch (\Exception $e) {
      $this->assertTrue(TRUE, 'Collector threw appropriate exception on lock violation.');
    }

    try {
      $this->collector->restoreDefaults();
      $this->fail('No exception thrown exception when an attempt was made to change protected values while the collector was locked.');
    }
    catch (\Exception $e) {
      $this->assertTrue(TRUE, 'Collector threw appropriate exception on lock violation.');
    }

    try {
      $this->collector->clearBag();
      $this->fail('No exception thrown exception when an attempt was made to clear the current bag while the collector was locked.');
    }
    catch (\Exception $e) {
      $this->assertTrue(TRUE, 'Collector threw appropriate exception on lock violation.');
    }