public function testFailingScope()
 {
     $s = new Scope("read write delete");
     $this->assertFalse($s->isSubsetOf(new Scope("read write update")));
     $this->assertFalse($s->hasScope(new Scope("foo")));
 }
 public function hasScope($scope)
 {
     $grantedScope = new Scope($this->_grantedScope);
     $requiredScope = new Scope($scope);
     return $grantedScope->hasScope($requiredScope);
 }