feat: add Math source file with tests

Author: SlimDeluxe

src/Math.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace DataLinx\PhpPackageTemplate;
+
+class Math
+{
+    public static function add($a, $b)
+    {
+        return $a + $b;
+    }
+
+    public static function subtract($a, $b)
+    {
+        return $a - $b;
+    }
+
+    public static function multiply($a, $b)
+    {
+        return $a * $b;
+    }
+
+}

tests/Feature/ExampleTest.php

@@ -0,0 +1,5 @@
+<?php
+
+test('example', function () {
+    expect(true)->toBeTrue();
+});

tests/Unit/MathTest.php

@@ -0,0 +1,15 @@
+<?php
+
+use DataLinx\PhpPackageTemplate\Math;
+
+test('it adds two numbers', function () {
+    expect(Math::add(1, 2))->toBe(3);
+});
+
+test('it subtracts two numbers', function () {
+    expect(Math::subtract(2, 1))->toBe(1);
+});
+
+test('it multiplies two numbers', function () {
+    expect(Math::multiply(2, 2))->toBe(4);
+});