Add a test to check that removing types doesn't crash

Author: AydinHassan

test/Exercise/PhpGetsAPromotionTest.php

@@ -93,6 +93,15 @@ public function testFailureIfPropertiesChangeType(): void
         $this->assertResultsHasFailure(Failure::class, 'Property "key" should not have changed type');
     }
 
+    public function testFailureIfPropertiesTypeRemoved(): void
+    {
+        $this->runExercise('solution-type-removed.php');
+
+        $this->assertVerifyWasNotSuccessful();
+
+        $this->assertResultsHasFailure(Failure::class, 'Properties "key" & "basePath" should not have changed type');
+    }
+
     public function testFailureIfPropertyDataIncorrect(): void
     {
         $this->runExercise('solution-data-not-set.php');

test/solutions/php-gets-a-promotion/solution-type-removed.php

@@ -1,12 +1,12 @@
 <?php
 
-class RowVisitorTypeMutated
+class RowVisitorTypeRemoved
 {
-    protected string $basePath;
+    protected $basePath;
 
     public function __construct(
         private \Closure $visitor,
-        private \Stringable $key,
+        private $key,
         array $config = []
     ) {
         $this->basePath = $config['basePath'] ?? '';