feat: add comprehensive tests for Medium, OtpCode, Shift models and various Enums

tests/Feature/Models/ShiftTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Tests\Feature\Models;
+
+use App\Models\Shift;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class ShiftTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_active_scope_returns_only_active_shifts(): void
+    {
+        $active = Shift::factory()->create();
+        Shift::factory()->inactive()->create();
+
+        $this->assertSame([$active->id], Shift::active()->pluck('id')->all());
+    }
+
+    public function test_open_scope_returns_only_unassigned_shifts(): void
+    {
+        $open = Shift::factory()->create();
+        Shift::factory()->forDoctor()->create();
+
+        $this->assertSame([$open->id], Shift::open()->pluck('id')->all());
+    }
+
+    public function test_scopes_can_be_chained(): void
+    {
+        $target = Shift::factory()->create();
+        Shift::factory()->inactive()->create();
+        Shift::factory()->forDoctor()->create();
+        Shift::factory()->forDoctor()->inactive()->create();
+
+        $this->assertSame([$target->id], Shift::active()->open()->pluck('id')->all());
+    }
+}