diff --git a/tests/Unit/Subscription/Engine/SubscriptionCollectionTest.php b/tests/Unit/Subscription/Engine/SubscriptionCollectionTest.php
new file mode 100644
index 00000000..5c7d2bdf
--- /dev/null
+++ b/tests/Unit/Subscription/Engine/SubscriptionCollectionTest.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Patchlevel\EventSourcing\Tests\Unit\Subscription\Engine;
+
+use Patchlevel\EventSourcing\Subscription\Engine\SubscriptionCollection;
+use Patchlevel\EventSourcing\Subscription\Subscription;
+use PHPUnit\Framework\TestCase;
+
+use function iterator_to_array;
+
+final class SubscriptionCollectionTest extends TestCase
+{
+    public function testEmpty(): void
+    {
+        $collection = new SubscriptionCollection([]);
+
+        self::assertCount(0, $collection);
+        self::assertEquals([], iterator_to_array($collection));
+        self::assertEquals(0, $collection->lowestPosition());
+    }
+
+    public function testSomeSubscription(): void
+    {
+        $subscription1 = new Subscription('foo', position: 5);
+        $subscription2 = new Subscription('bar', position: 10);
+
+        $collection = new SubscriptionCollection([$subscription1, $subscription2]);
+
+        self::assertCount(2, $collection);
+        self::assertEquals([$subscription1, $subscription2], iterator_to_array($collection));
+        self::assertEquals(5, $collection->lowestPosition());
+    }
+
+    public function testRemove(): void
+    {
+        $subscription1 = new Subscription('foo', position: 5);
+        $subscription2 = new Subscription('bar', position: 10);
+
+        $collection = new SubscriptionCollection([$subscription1, $subscription2]);
+        $collection->remove($subscription1);
+
+        self::assertCount(1, $collection);
+        self::assertEquals([$subscription2], iterator_to_array($collection));
+        self::assertEquals(10, $collection->lowestPosition());
+    }
+}
diff --git a/tests/Unit/Subscription/Engine/SubscriptionManagerTest.php b/tests/Unit/Subscription/Engine/SubscriptionManagerTest.php
index d779ded8..0bc9cd50 100644
--- a/tests/Unit/Subscription/Engine/SubscriptionManagerTest.php
+++ b/tests/Unit/Subscription/Engine/SubscriptionManagerTest.php
@@ -109,7 +109,7 @@ public function testFind(): void
         $manager = new SubscriptionManager($store->reveal());
         $result = $manager->find($criteria);
 
-        self::assertSame([$subscription], iterator_to_array($result));
+        self::assertSame([$subscription], $result);
     }
 
     public function testFindForUpdateWithoutLock(): void