1. <?php
2.  
3. class Calculator
4. {
5.         public static function add($a, $b)
6.         {
7.                 return $a + $b;
8.         }
9.  
10.         public static function divide($a, $b)
11.         {
12.                 return $a / $b;
13.         }
14. }
15.  
16. final class CalculatorTest extends TestCase
17. {
18.     public function testAddPositiveTest(): void
19.     {
20.         $this->assertEquals(Calculator::add(2, 5), 7);
21.         $this->assertSame(Calculator::add(0.9, 0.5), 1.4);
22.     }
23.  
24.     public function testAddNegativeTest(): void
25.     {
26.         // Negative Tests
27.         $this->assertNotEquals(Calculator::add(12, 3), 23);
28.         $this->assertIsNotBool(Calculator::add(2, 5));
29.     }
30.  
31.     public function testDividePositiveTest(): void
32.     {
33.         // Positive Tests
34.         $this->assertEquals(Calculator::divide(4, 2), 2);
35.         $this->assertEquals(Calculator::divide(0.9, 0.3), 3);
36.  
37.     }
38.  
39.     public function testDivideNegativeTest(): void
40.     {
41.         // Negative Tests
42.         $this->assertNotEquals(Calculator::divide(12, 3), 3);
43.         $this->assertNotSame(Calculator::divide(0.9, 0.3), 3);
44.  
45.     }
46. }