Remove unused exception and add a new testcase covering using the same id more then once

Author: DanielBadura

src/Metadata/MultipleDataSubjectId.php

@@ -448,6 +448,32 @@ public function __construct(
         self::assertSame('bar', $barNameProperty->personalDataIdentifier());
     }
 
+    public function testDuplicateSubjectIdIdentifiers(): void
+    {
+        $event = new class ('fooId', 'fooName', 'barId', 'barName') {
+            public function __construct(
+                #[DataSubjectId(identifier: 'foo')]
+                #[NormalizedName('_fooId')]
+                public string $fooId,
+                #[PersonalData('fallback', identifier: 'foo')]
+                #[NormalizedName('_fooName')]
+                public string $fooName,
+                #[DataSubjectId(identifier: 'foo')]
+                #[NormalizedName('_barId')]
+                public string $barId,
+                #[PersonalData('fallback', identifier: 'foo')]
+                #[NormalizedName('_barName')]
+                public string $barName,
+            ) {
+            }
+        };
+
+        $metadataFactory = new AttributeMetadataFactory();
+
+        $this->expectException(DuplicateSubjectIdIdentifier::class);
+        $metadataFactory->metadata($event::class);
+    }
+
     public function testExtendsWithPersonalData(): void
     {
         $metadataFactory = new AttributeMetadataFactory();