Test that child models extending a parent that uses VirtualColumn get encoded correctly (#16)

* Test that using different models extending the same class with VirtualColumn doesn't work correctly

* Add regression test for faulty logic

* Delete unused import

* Add migration

* Fix migrations

* Make the assertions check the intended behavior

tests/etc/migrations/2023_05_11_000001_create_bar_childs_table.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateBarChildsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('bar_childs', function (Blueprint $table) {
+            $table->increments('id');
+
+            $table->string('bar')->nullable();
+
+            $table->json('data')->nullable();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('bar_childs');
+    }
+}

tests/etc/migrations/2023_10_21_000001_create_foo_childs_table.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateFooChildsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('foo_childs', function (Blueprint $table) {
+            $table->increments('id');
+
+            $table->string('foo')->nullable();
+
+            $table->json('data')->nullable();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('foo_childs');
+    }
+}