public function testRemoveInitialisesDenyArray()
 {
     $list = new CurrencyList();
     $this->assertTrue($list->isAllowed('USD'));
     $this->assertTrue($list->isAllowed('GBP'));
     $this->assertSame($list, $list->remove('GBP'));
     $this->assertTrue($list->isAllowed('USD'));
     $this->assertFalse($list->isAllowed('GBP'));
     $expect = count($list->getKnown()) - 1;
     $this->assertCount($expect, $list->getAllow());
 }