two test model created;

tests/Core/Models/Post.php

@@ -0,0 +1,19 @@
+<?php
+
+	namespace Hans\Lyra\Tests\Core\Models;
+
+	use Hans\Lyra\Models\Invoice;
+	use Illuminate\Database\Eloquent\Model;
+	use Illuminate\Database\Eloquent\Relations\MorphToMany;
+
+	class Post extends Model {
+
+		protected $fillable = [
+			'title',
+			'description',
+		];
+
+		public function invoices(): MorphToMany {
+			return $this->morphToMany( Invoice::class, 'invoicable' );
+		}
+	}

tests/Core/Models/Product.php

@@ -0,0 +1,20 @@
+<?php
+
+	namespace Hans\Lyra\Tests\Core\Models;
+
+	use Hans\Lyra\Models\Invoice;
+	use Illuminate\Database\Eloquent\Model;
+	use Illuminate\Database\Eloquent\Relations\MorphToMany;
+
+	class Product extends Model {
+
+		protected $fillable = [
+			'title',
+			'brand'
+		];
+
+		public function invoices(): MorphToMany {
+			return $this->morphToMany( Invoice::class, 'invoicable' );
+		}
+
+	}

tests/Core/migrations/2023_08_25_100000_create_posts_table.php

@@ -0,0 +1,31 @@
+<?php
+
+	use Hans\Lyra\Tests\Core\Models\Post;
+	use Illuminate\Database\Migrations\Migration;
+	use Illuminate\Database\Schema\Blueprint;
+	use Illuminate\Support\Facades\Schema;
+
+	return new class() extends Migration {
+		/**
+		 * Run the migrations.
+		 *
+		 * @return void
+		 */
+		public function up(): void {
+			Schema::create( ( new Post )->getTable(), function( Blueprint $table ) {
+				$table->id();
+				$table->string( 'title' );
+				$table->text( 'description' );
+				$table->timestamps();
+			} );
+		}
+
+		/**
+		 * Reverse the migrations.
+		 *
+		 * @return void
+		 */
+		public function down(): void {
+			Schema::dropIfExists( ( new Post )->getTable() );
+		}
+	};

tests/Core/migrations/2023_08_25_100001_create_products_table.php

@@ -0,0 +1,32 @@
+<?php
+
+	use Hans\Lyra\Models\Invoice;
+	use Hans\Lyra\Tests\Core\Models\Product;
+	use Illuminate\Database\Migrations\Migration;
+	use Illuminate\Database\Schema\Blueprint;
+	use Illuminate\Support\Facades\Schema;
+
+	return new class() extends Migration {
+		/**
+		 * Run the migrations.
+		 *
+		 * @return void
+		 */
+		public function up(): void {
+			Schema::create( ( new Product )->getTable(), function( Blueprint $table ) {
+				$table->id();
+				$table->string( 'name' );
+				$table->string( 'brand' );
+				$table->timestamps();
+			} );
+		}
+
+		/**
+		 * Reverse the migrations.
+		 *
+		 * @return void
+		 */
+		public function down(): void {
+			Schema::dropIfExists( ( new Product )->getTable() );
+		}
+	};

tests/TestCase.php

@@ -21,6 +21,7 @@ class TestCase extends BaseTestCase
     protected function setUp(): void
     {
         parent::setUp();
+		$this->loadMigrationsFrom(__DIR__.'/Core/migrations');
 
 	    $this->client = new Client;
     }