public function testAdd()
{
$abcd = new Calculator(2, 4);
$addition = $abcd->add();
$this->assertEquals(6, $addition, 'addition failed!');
}
public function testAdd()
{
$c = new Calculator();
$result = $c->add(5, 10);
$this->assertEquals(15, $result);
}
public function testTrue()
{
$calculator = new Calculator();
$actual = $calculator->add(3, 4);
$this->assertEquals(7, $actual);
}