Allow for AggregateRoot to record multiple events

src/Testing/GivenWhenThen/Scenario.php

@@ -79,10 +79,10 @@ public function when(object $command): self
         return $instance;
     }
 
-    public function then(object $event): self
+    public function then(object ...$event): self
     {
         $instance = clone $this;
-        $instance->outcome = new ThenEvent($event);
+        $instance->outcome = count($event) > 1 ? new ThenEvents(...$event) : new ThenEvent($event[0]);
 
         return $instance;
     }
@@ -220,6 +220,35 @@ public function assert(): self
             $this->assertObjectSurvivesSerializationRoundTrip($recordedEvent);
         }
 
+        if ($instance->outcome instanceof ThenEvents) {
+            $expectedEvents = array_values($instance->outcome->events);
+
+            Assert::assertGreaterThan(
+                1,
+                count($expectedEvents),
+                'Should expect at least two events.'
+            );
+
+            Assert::assertCount(
+                count($expectedEvents),
+                $recordedEvents,
+                sprintf('Expected exactly %d events.', count($expectedEvents))
+            );
+
+            while (count($recordedEvents) > 0) {
+                $recordedEvent = array_shift($recordedEvents);
+                $expectedEvent = array_shift($expectedEvents);
+
+                if ($expectedEvent instanceof TestObject) {
+                    $expectedEvent = $expectedEvent->build();
+                }
+
+                Assert::assertEquals($expectedEvent, $recordedEvent);
+
+                $this->assertObjectSurvivesSerializationRoundTrip($recordedEvent);
+            }
+        }
+
         $this->assertObjectSurvivesSerializationRoundTrip($instance->when->command);
 
         return $instance;

src/Testing/GivenWhenThen/ThenEvents.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dflydev\EventSauce\Support\Testing\GivenWhenThen;
+
+final readonly class ThenEvents implements Then
+{
+    /** @var array<object> */
+    public array $events;
+
+    public function __construct(object ...$events)
+    {
+        $this->events = $events;
+    }
+}