public function testOperation_and() { $this->assertEquals('0', databox_status::operation_and('0x001', '0x010')); $this->assertEquals('1', databox_status::operation_and('01', '11')); $this->assertEquals('0', databox_status::operation_and('01', '10')); $this->assertEquals('10', databox_status::operation_and('11', '10')); }