Add test for deprecated classes

tests/Compatibility/DeprecatedClassesTest.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * The MIT License (MIT).
+ *
+ * Copyright (c) 2017-2023 Michael Dekker (https://github.com/firstred)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+ * associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
+ * is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+ * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * @author    Michael Dekker <git@michaeldekker.nl>
+ * @copyright 2017-2023 Michael Dekker
+ * @license   https://opensource.org/licenses/MIT The MIT License
+ */
+
+namespace Firstred\PostNL\Tests\Compatibility;
+
+ use Firstred\PostNL\Entity\Address;
+ use Yoast\PHPUnitPolyfills\TestCases\TestCase;
+
+/**
+ * Class EnvelopeTest.
+ *
+ * @testdox The Envelope class
+ */
+class DeprecatedClassesTest extends TestCase
+{
+    /**
+     * @testdox can autoload a deprecated class
+     */
+    public function testDeprecatedClass()
+    {
+        $deprecatedAddress = new \ThirtyBees\PostNL\Entity\Address();
+
+        $this->assertInstanceOf(Address::class, $deprecatedAddress);
+    }
+}