public function testCalculate()
{
$mult = new Multiplication();
$this->assertEquals(12, $mult->calculate(3, 4));
$this->assertEquals(-12, $mult->calculate(3, -4));
}
public function testMultipliesNumbers()
{
$multiplication = new Multiplication();
$result = $multiplication->run(10, 5);
$this->assertSame(50, $result);
}