diff --git a/Neos.ContentRepository.Core/Tests/Unit/Feature/NodeReferencing/Event/NodeReferencesWereSetTest.php b/Neos.ContentRepository.Core/Tests/Unit/Feature/NodeReferencing/Event/NodeReferencesWereSetTest.php
new file mode 100644
index 00000000000..8567d7b088a
--- /dev/null
+++ b/Neos.ContentRepository.Core/Tests/Unit/Feature/NodeReferencing/Event/NodeReferencesWereSetTest.php
@@ -0,0 +1,77 @@
+<?php
+
+/*
+ * This file is part of the Neos.ContentRepository.Core package.
+ *
+ * (c) Contributors of the Neos Project - www.neos.io
+ *
+ * This package is Open Source Software. For the full copyright and license
+ * information, please view the LICENSE file which was distributed with this
+ * source code.
+ */
+
+declare(strict_types=1);
+
+namespace Neos\ContentRepository\Core\Tests\Unit\Feature\NodeReferencing\Event;
+
+use Neos\ContentRepository\Core\DimensionSpace\OriginDimensionSpacePointSet;
+use Neos\ContentRepository\Core\Feature\NodeReferencing\Dto\SerializedNodeReferences;
+use Neos\ContentRepository\Core\Feature\NodeReferencing\Event\NodeReferencesWereSet;
+use Neos\ContentRepository\Core\SharedModel\Node\NodeAggregateId;
+use Neos\ContentRepository\Core\SharedModel\Node\ReferenceName;
+use Neos\ContentRepository\Core\SharedModel\Workspace\ContentStreamId;
+use Neos\ContentRepository\Core\SharedModel\Workspace\WorkspaceName;
+use PHPUnit\Framework\TestCase;
+
+class NodeReferencesWereSetTest extends TestCase
+{
+    /**
+     * @param array<string,mixed> $payload
+     * @dataProvider eventPayloadProviderWithLegacySourceNodeAggregateIdFormat
+     */
+    public function testFromArray(array $payload, NodeReferencesWereSet $expectedEvent): void
+    {
+        self::assertEquals($expectedEvent, NodeReferencesWereSet::fromArray($payload));
+    }
+
+    /**
+     * The property sourceNodeAggregateId was renamed to nodeAggregateId.
+     * A runtime migration was added to {@see NodeReferencesWereSet::fromArray()} to handle the legacy format.
+     *
+     * Via #5153: https://github.com/neos/neos-development-collection/pull/5153
+     *
+     * Included in Juni 2024
+     *
+     * @return iterable<mixed>
+     */
+    public static function eventPayloadProviderWithLegacySourceNodeAggregateIdFormat(): iterable
+    {
+        yield 'legacy coveredDimensionSpacePoints succeedingNodeAggregateId fields are transformed' => [
+            [
+                'contentStreamId' => 'e542b7d2-a7c1-4bd8-b02a-3e8450829965',
+                'sourceNodeAggregateId' => '3b4ecdc0-8115-41ed-805d-fb98ced2276a',
+                'affectedSourceOriginDimensionSpacePoints' =>
+                    [
+                        [
+                            'language' => 'en_US',
+                        ],
+                    ],
+                'referenceName' => 'blogs',
+                'references' => [],
+                'workspaceName' => 'user-admin',
+            ],
+            new NodeReferencesWereSet(
+                WorkspaceName::fromString('user-admin'),
+                ContentStreamId::fromString('e542b7d2-a7c1-4bd8-b02a-3e8450829965'),
+                NodeAggregateId::fromString('3b4ecdc0-8115-41ed-805d-fb98ced2276a'),
+                OriginDimensionSpacePointSet::fromArray([
+                    [
+                        'language' => 'en_US',
+                    ],
+                ]),
+                ReferenceName::fromString('blogs'),
+                SerializedNodeReferences::fromArray([])
+            )
+        ];
+    }
+}