NamedEvents names should be unique (#158)

packages/PdoEventSourcing/src/Config/EventSourcingModule.php

@@ -112,6 +112,10 @@ public static function create(AnnotationFinder $annotationRegistrationService, I
             /** @var NamedEvent $attribute */
             $attribute = $annotationRegistrationService->getAttributeForClass($namedEventClass, NamedEvent::class);
 
+            if (array_key_exists($attribute->getName(), $fromNameToClassMapping)) {
+                throw new \RuntimeException(sprintf('Named Events should have unique names. However, `%s` is used more than once.', $attribute->getName()));
+            }
+
             $fromClassToNameMapping[$namedEventClass] = $attribute->getName();
             $fromNameToClassMapping[$attribute->getName()] = $namedEventClass;
         }

packages/PdoEventSourcing/tests/Fixture/UniqueEventNames/EventWithDuplicatedName.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\Ecotone\EventSourcing\Fixture\UniqueEventNames;
+
+use Ecotone\Modelling\Attribute\NamedEvent;
+
+#[NamedEvent('event')]
+final class EventWithDuplicatedName
+{
+}

packages/PdoEventSourcing/tests/Fixture/UniqueEventNames/EventWithUniqueName.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\Ecotone\EventSourcing\Fixture\UniqueEventNames;
+
+use Ecotone\Modelling\Attribute\NamedEvent;
+
+#[NamedEvent('event')]
+final class EventWithUniqueName
+{
+}

packages/PdoEventSourcing/tests/Integration/UniqueNamedEventsTest.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\Ecotone\EventSourcing\Integration;
+
+use Ecotone\Lite\EcotoneLite;
+use Ecotone\Lite\Test\Configuration\InMemoryRepositoryBuilder;
+use Ecotone\Messaging\Config\ModulePackageList;
+use Ecotone\Messaging\Config\ServiceConfiguration;
+use PHPUnit\Framework\TestCase;
+use Test\Ecotone\EventSourcing\Fixture\Ticket\Ticket;
+
+final class UniqueNamedEventsTest extends TestCase
+{
+    public function test_event_names_should_be_unique(): void
+    {
+        $this->expectExceptionObject(new \RuntimeException('Named Events should have unique names. However, `event` is used more than once.'));
+
+        EcotoneLite::bootstrapForTesting(
+            [Ticket::class],
+            configuration: ServiceConfiguration::createWithDefaults()
+                ->withSkippedModulePackageNames(ModulePackageList::allPackagesExcept([ModulePackageList::EVENT_SOURCING_PACKAGE]))
+                ->withExtensionObjects([
+                    InMemoryRepositoryBuilder::createForAllEventSourcedAggregates(),
+                ])
+                ->withNamespaces([
+                    'Test\Ecotone\EventSourcing\Fixture\UniqueEventNames',
+                ]),
+            pathToRootCatalog: __DIR__ . '/../../',
+        )
+            ->getFlowTestSupport()
+        ;
+    }
+}