add services logic

tests/Unit/Services/System/GlobalConfigServiceTest.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Tests\Unit\Services\System;
+
+use App\Services\System\GlobalConfigService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+class GlobalConfigServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_get_semester_and_school_year(): void
+    {
+        DB::table('configuration')->insert([
+            ['config_key' => 'semester', 'config_value' => 'Fall'],
+            ['config_key' => 'school_year', 'config_value' => '2024-2025'],
+        ]);
+
+        $service = new GlobalConfigService();
+
+        $this->assertSame('Fall', $service->getSemester());
+        $this->assertSame('2024-2025', $service->getSchoolYear());
+    }
+}