diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 31afe8e31..9f953bade 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -11,6 +11,7 @@
         xsi:noNamespaceSchemaLocation="/vendor/phpunit/phpunit/phpunit.xsd"
         cacheDirectory=".phpunit.cache"
         requireCoverageMetadata="false"
+        displayDetailsOnTestsThatTriggerWarnings="true"
 >
   <testsuites>
     <testsuite name="unit">
diff --git a/tests/Unit/EventBus/Serializer/PhpNativeMessageSerializerTest.php b/tests/Unit/EventBus/Serializer/PhpNativeMessageSerializerTest.php
index f26a6f031..05d3c16ba 100644
--- a/tests/Unit/EventBus/Serializer/PhpNativeMessageSerializerTest.php
+++ b/tests/Unit/EventBus/Serializer/PhpNativeMessageSerializerTest.php
@@ -52,13 +52,13 @@ public function testDeserialize(): void
         ], $message->headers());
     }
 
-    public function testDeserializeEncodeFailed(): void
+    public function testDeserializeDecodeFailed(): void
     {
         $this->expectException(DeserializeFailed::class);
 
         $nativeSerializer = new PhpNativeMessageSerializer();
 
-        $nativeSerializer->deserialize('FOO');
+        $nativeSerializer->deserialize('!@#%$^&*()');
     }
 
     public function testDeserializeNotAMessage(): void
diff --git a/tests/Unit/Outbox/DoctrineOutboxStoreTest.php b/tests/Unit/Outbox/DoctrineOutboxStoreTest.php
index 83d7429f8..edf1155d1 100644
--- a/tests/Unit/Outbox/DoctrineOutboxStoreTest.php
+++ b/tests/Unit/Outbox/DoctrineOutboxStoreTest.php
@@ -8,9 +8,7 @@
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Driver;
 use Doctrine\DBAL\Query\QueryBuilder;
-use Doctrine\DBAL\Schema\Column;
 use Doctrine\DBAL\Schema\Schema;
-use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Types\Types;
 use Patchlevel\EventSourcing\EventBus\Message;
 use Patchlevel\EventSourcing\EventBus\Serializer\MessageSerializer;
@@ -212,7 +210,6 @@ public function testRetrieveOutboxMessages(): void
     public function testConfigureSchema(): void
     {
         $connection = $this->prophesize(Connection::class);
-
         $serializer = $this->prophesize(MessageSerializer::class);
 
         $doctrineOutboxStore = new DoctrineOutboxStore(
@@ -220,30 +217,21 @@ public function testConfigureSchema(): void
             $serializer->reveal(),
         );
 
-        $table = $this->prophesize(Table::class);
-        $column = $this->prophesize(Column::class);
-        $table->addColumn('id', Types::INTEGER)->shouldBeCalledOnce()
-            ->willReturn(
-                $column
-                    ->setNotnull(true)->shouldBeCalledOnce()
-                    ->getObjectProphecy()->setAutoincrement(true)->shouldBeCalledOnce()->willReturn($column->reveal())
-                    ->getObjectProphecy()->reveal(),
-            );
-
-        $column = $this->prophesize(Column::class);
-        $table->addColumn('message', Types::TEXT)->shouldBeCalledOnce()
-            ->willReturn(
-                $column
-                    ->setNotnull(true)->shouldBeCalledOnce()
-                    ->getObjectProphecy()->setLength(16_000)->shouldBeCalledOnce()->willReturn($column->reveal())
-                    ->getObjectProphecy()->reveal(),
-            );
-
-        $table->setPrimaryKey(['id'])->shouldBeCalledOnce();
-
-        $schema = $this->prophesize(Schema::class);
-        $schema->createTable('outbox')->shouldBeCalledOnce()->willReturn($table->reveal());
-
-        $doctrineOutboxStore->configureSchema($schema->reveal(), $connection->reveal());
+        $expectedSchema = new Schema();
+        $table = $expectedSchema->createTable('outbox');
+
+        $table->addColumn('id', Types::INTEGER)
+            ->setNotnull(true)
+            ->setAutoincrement(true);
+        $table->addColumn('message', Types::STRING)
+            ->setNotnull(true)
+            ->setLength(16_000);
+
+        $table->setPrimaryKey(['id']);
+
+        $schema = new Schema();
+        $doctrineOutboxStore->configureSchema($schema, $connection->reveal());
+
+        $this->assertEquals($expectedSchema, $schema);
     }
 }