Add User unit tests

app/Models/User.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 
@@ -48,11 +49,21 @@ class User extends Authenticatable
      */
     protected $hidden = ['password', 'remember_token', 'created_at', 'updated_at'];
 
+    /**
+     * A user can have many playlists.
+     *
+     * @return HasMany
+     */
     public function playlists()
     {
         return $this->hasMany(Playlist::class);
     }
 
+    /**
+     * A user can make multiple interactions.
+     *
+     * @return HasMany
+     */
     public function interactions()
     {
         return $this->hasMany(Interaction::class);

tests/Unit/UserTest.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Models\User;
+use Tests\TestCase;
+
+class UserTest extends TestCase
+{
+    /** @test */
+    public function it_can_be_instantiated()
+    {
+        $this->assertInstanceOf(User::class, new User());
+    }
+
+    /** @test */
+    public function user_preferences_can_be_set()
+    {
+        // Given a user
+        /** @var User $user */
+        $user = factory(User::class)->create();
+
+        // When I see the user's preference
+        $user->setPreference('foo', 'bar');
+
+        // Then I see the preference properly set
+        $this->assertArraySubset(['foo' => 'bar'], $user->preferences);
+    }
+
+    /** @test */
+    public function user_preferences_can_be_retrieved()
+    {
+        // Given a user with some preferences
+        /** @var User $user */
+        $user = factory(User::class)->create([
+            'preferences' => ['foo' => 'bar'],
+        ]);
+
+        // When I get a preference by its key
+        $value = $user->getPreference('foo');
+
+        // Then I retrieve the preference value
+        $this->assertEquals('bar', $value);
+    }
+
+    /** @test */
+    public function user_preferences_can_be_deleted()
+    {
+        // Given a user with some preferences
+        /** @var User $user */
+        $user = factory(User::class)->create([
+            'preferences' => ['foo' => 'bar'],
+        ]);
+
+        // When I delete the preference by its key
+        $user->deletePreference('foo');
+
+        // Then I see the preference gets deleted
+        $this->assertArrayNotHasKey('foo', $user->preferences);
+    }
+
+    /** @test */
+    public function sensitive_preferences_are_hidden()
+    {
+        // Given a user with sensitive preferences
+        /** @var User $user */
+        $user = factory(User::class)->create([
+            'preferences' => ['lastfm_session_key' => 'foo'],
+        ]);
+
+        // When I try to access the sensitive preferences
+        $value = $user->preferences['lastfm_session_key'];
+
+        // Then the sensitive preferences are replaced with "hidden"
+        $this->assertEquals('hidden', $value);
+    }
+}