increase test coverage (#117)

70% test coverage
remove socialite

app/Models/StorageProvider.php

@@ -4,6 +4,7 @@
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 /**
  * @property int $user_id
@@ -39,4 +40,9 @@ public function provider(): \App\StorageProviders\StorageProvider
 
         return new $providerClass($this);
     }
+
+    public function backups(): HasMany
+    {
+        return $this->hasMany(Backup::class, 'storage_id');
+    }
 }