<?php


use PHPUnitFrameworkTestCase;

class Calculator
{
	public static function add($a, $b)
	{
		return $a + $b;
	}

	public static function divide($a, $b)
	{
		return $a / $b;
	}
}

class CalculatorTest extends TestCase 
{

    public function testAddPositive(): void
    {
        $this->assertEquals(3, Calculator::add(1, 2));
    }
  
    public function testAddnegative(): void
    {
        $this->assertNotEquals(2, Calculator::add(1, "AS"));
    }


    public function testDividePositive(): void
    {
        $this->assertEquals(2, Calculator::divide(2, 2));
    }

    
    public function testDivideNegative(): void
    {
        $this->assertNotEquals(1, Calculator::divide(1, 5));

    }
}