Issue #3517317 by penyaskito, larowlan: SDC slots not being validated against json config schema

core/assets/schemas/v1/metadata-full.schema.json

@@ -5,7 +5,7 @@
     "slotDefinition": {
       "type": "object",
       "patternProperties": {
-        "^[a-zA-Z0-9_-]$": {
+        "^[a-zA-Z0-9_-]+$": {
           "type": "object",
           "properties": {
             "title": {

core/assets/schemas/v1/metadata.schema.json

@@ -5,7 +5,7 @@
     "slotDefinition": {
       "type": "object",
       "patternProperties": {
-        "^[a-zA-Z0-9_-]$": {
+        "^[a-zA-Z0-9_-]+$": {
           "type": "object",
           "properties": {
             "title": {

core/tests/Drupal/Tests/Core/Theme/Component/ComponentValidatorTest.php

@@ -78,10 +78,26 @@ public static function dataProviderValidateDefinitionInvalid(): array {
       $valid_cta,
       ['extension_type' => 'invalid'],
     );
+    $cta_with_invalid_slot_type = $valid_cta;
+    $cta_with_invalid_slot_type['slots'] = [
+      'valid_slot' => [
+        'title' => 'Valid slot',
+        'description' => 'Valid slot description',
+      ],
+      'invalid_slot' => [
+        'title' => [
+          'hello' => 'Invalid slot',
+          'world' => 'Invalid slot',
+        ],
+        'description' => 'Title must be string',
+      ],
+    ];
+
     return [
       [$cta_with_missing_required],
       [$cta_with_invalid_class],
       [$cta_with_invalid_enum],
+      [$cta_with_invalid_slot_type],
     ];
   }