add tests

Author: CodeWithSushil

tests/BaseTest.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Supabase\Tests;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(Calculator::class)]
+class BaseTest extends TestCase
+{
+    #[Test]
+    public function two_number_same()
+    {
+        $this->assertSame(4, 4);
+    }
+}