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);
 }