public function testExclusive()
 {
     $loader = new ClassLoader();
     $loader->pushManifest($this->testManifest1);
     $this->assertTrue((bool) $loader->getItemPath('ClassA'));
     $this->assertFalse((bool) $loader->getItemPath('OtherClassA'));
     $loader->pushManifest($this->testManifest2);
     $this->assertFalse((bool) $loader->getItemPath('ClassA'));
     $this->assertTrue((bool) $loader->getItemPath('OtherClassA'));
     $loader->popManifest();
     $loader->pushManifest($this->testManifest2, false);
     $this->assertTrue((bool) $loader->getItemPath('ClassA'));
     $this->assertTrue((bool) $loader->getItemPath('OtherClassA'));
 }