diff --git a/app/Models/User.php b/app/Models/User.php
index 7e7da3b..949cafa 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -66,4 +66,9 @@ class User extends Authenticatable // implements MustVerifyEmail
     {
         return $this->hasMany(Device::class);
     }
+
+    public function plugins(): HasMany
+    {
+        return $this->hasMany(Plugin::class);
+    }
 }
diff --git a/tests/Pest.php b/tests/Pest.php
index bf47dd2..627fd57 100644
--- a/tests/Pest.php
+++ b/tests/Pest.php
@@ -13,7 +13,7 @@
 
 pest()->extend(Tests\TestCase::class)
     ->use(Illuminate\Foundation\Testing\RefreshDatabase::class)
-    ->in('Feature');
+    ->in('Feature', 'Unit');
 
 registerSpatiePestHelpers();
 
diff --git a/tests/Unit/Models/PlaylistItemTest.php b/tests/Unit/Models/PlaylistItemTest.php
new file mode 100644
index 0000000..482549a
--- /dev/null
+++ b/tests/Unit/Models/PlaylistItemTest.php
@@ -0,0 +1,24 @@
+<?php
+
+use App\Models\Playlist;
+use App\Models\PlaylistItem;
+use App\Models\Plugin;
+
+
+test('playlist item belongs to playlist', function () {
+    $playlist = Playlist::factory()->create();
+    $playlistItem = PlaylistItem::factory()->create(['playlist_id' => $playlist->id]);
+
+    expect($playlistItem->playlist)
+        ->toBeInstanceOf(Playlist::class)
+        ->id->toBe($playlist->id);
+});
+
+test('playlist item belongs to plugin', function () {
+    $plugin = Plugin::factory()->create();
+    $playlistItem = PlaylistItem::factory()->create(['plugin_id' => $plugin->id]);
+
+    expect($playlistItem->plugin)
+        ->toBeInstanceOf(Plugin::class)
+        ->id->toBe($plugin->id);
+});
diff --git a/tests/Unit/Models/PlaylistTest.php b/tests/Unit/Models/PlaylistTest.php
new file mode 100644
index 0000000..55d31c7
--- /dev/null
+++ b/tests/Unit/Models/PlaylistTest.php
@@ -0,0 +1,46 @@
+<?php
+
+use App\Models\Device;
+use App\Models\Playlist;
+use App\Models\PlaylistItem;
+
+test('playlist has required attributes', function () {
+    $playlist = Playlist::factory()->create([
+        'name' => 'Test Playlist',
+        'is_active' => true,
+        'weekdays' => [1, 2, 3],
+        'active_from' => '09:00',
+        'active_until' => '17:00',
+    ]);
+
+    expect($playlist)
+        ->name->toBe('Test Playlist')
+        ->is_active->toBeTrue()
+        ->weekdays->toBe([1, 2, 3])
+        ->active_from->format('H:i')->toBe('09:00')
+        ->active_until->format('H:i')->toBe('17:00');
+});
+
+test('playlist belongs to device', function () {
+    $device = Device::factory()->create();
+    $playlist = Playlist::factory()->create(['device_id' => $device->id]);
+
+    expect($playlist->device)
+        ->toBeInstanceOf(Device::class)
+        ->id->toBe($device->id);
+});
+
+test('playlist has many items', function () {
+    $playlist = Playlist::factory()->create();
+    $items = PlaylistItem::factory()->count(3)->create(['playlist_id' => $playlist->id]);
+
+    expect($playlist->items)
+        ->toHaveCount(3)
+        ->each->toBeInstanceOf(PlaylistItem::class);
+});
+
+test('getNextPlaylistItem returns null when playlist is inactive', function () {
+    $playlist = Playlist::factory()->create(['is_active' => false]);
+
+    expect($playlist->getNextPlaylistItem())->toBeNull();
+});
diff --git a/tests/Unit/Models/PluginTest.php b/tests/Unit/Models/PluginTest.php
new file mode 100644
index 0000000..f5cd2b3
--- /dev/null
+++ b/tests/Unit/Models/PluginTest.php
@@ -0,0 +1,42 @@
+<?php
+
+use App\Models\Plugin;
+
+uses(\Illuminate\Foundation\Testing\RefreshDatabase::class);
+
+test('plugin has required attributes', function () {
+    $plugin = Plugin::factory()->create([
+        'name' => 'Test Plugin',
+        'data_payload' => ['key' => 'value'],
+    ]);
+
+    expect($plugin)
+        ->name->toBe('Test Plugin')
+        ->data_payload->toBe(['key' => 'value'])
+        ->uuid->toBeString()
+        ->uuid->toMatch('/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/');
+});
+
+test('plugin automatically generates uuid on creation', function () {
+    $plugin = Plugin::factory()->create();
+
+    expect($plugin->uuid)
+        ->toBeString()
+        ->toMatch('/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/');
+});
+
+test('plugin can have custom uuid', function () {
+    $uuid = \Illuminate\Support\Str::uuid();
+    $plugin = Plugin::factory()->create(['uuid' => $uuid]);
+
+    expect($plugin->uuid)->toBe($uuid);
+});
+
+test('plugin data_payload is cast to array', function () {
+    $data = ['key' => 'value'];
+    $plugin = Plugin::factory()->create(['data_payload' => $data]);
+
+    expect($plugin->data_payload)
+        ->toBeArray()
+        ->toBe($data);
+});