Add failing test case to report error when using DiscriminatorMap with missing 'typePropery'

Author: lyrixx

tests/AutoMapperTest/DiscriminatorMapBadConfiguration/expected.data

@@ -0,0 +1,6 @@
+// This is not god! It should raise a proper exception, telling the key
+// `linkType` is not present is the source
+Error {
+  +class: "Error"
+  +message: "Cannot instantiate abstract class AutoMapper\Tests\AutoMapperTest\DiscriminatorMapBadConfiguration\LinkType"
+}

tests/AutoMapperTest/DiscriminatorMapBadConfiguration/map.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace AutoMapper\Tests\AutoMapperTest\DiscriminatorMapBadConfiguration;
+
+use AutoMapper\Tests\AutoMapperBuilder;
+use Symfony\Component\Serializer\Attribute\DiscriminatorMap;
+
+#[DiscriminatorMap('linkType', [
+    'default' => DefaultLinkType::class,
+])]
+abstract class LinkType
+{
+}
+
+class DefaultLinkType extends LinkType
+{
+    public function __construct(
+        public string $link,
+    ) {
+    }
+}
+
+$source = [
+    // There is a typo on the key `type`.
+    // It should be `linkType` instead of `type`.
+    'type' => 'default',
+    'link' => 'https://example.com',
+];
+
+try {
+    return AutoMapperBuilder::buildAutoMapper()->map($source, LinkType::class);
+} catch (\Throwable $th) {
+    return $th;
+}