public function testForgetArrayOfKeys()
 {
     $c = new Collection(['foo', 'bar', 'baz']);
     $c->forget([0, 2]);
     $this->assertFalse(isset($c[0]));
     $this->assertFalse(isset($c[2]));
     $this->assertTrue(isset($c[1]));
     $c = new Collection(['name' => 'taylor', 'foo' => 'bar', 'baz' => 'qux']);
     $c->forget(['foo', 'baz']);
     $this->assertFalse(isset($c['foo']));
     $this->assertFalse(isset($c['baz']));
     $this->assertTrue(isset($c['name']));
 }
 /**
  * @test
  */
 public function forgetで複数要素を削除する()
 {
     $collection = new Collection(['foo' => 1, 'bar' => 2, 'baz' => 3]);
     $collection->forget(['foo', 'bar']);
     $this->assertFalse($collection->has('foo'));
     $this->assertFalse($collection->has('bar'));
     $this->assertTrue($collection->has('baz'));
 }