Smoke cleanup waiter (#1864)

* Add waiter to S3 integration test to prevent failed bucket deletions

* Add changelog

.changes/nextrelease/smoke_cleanup_waiter.json

@@ -0,0 +1,7 @@
+[
+  {
+    "type": "bugfix",
+    "category": "Test\\Integ",
+    "description": "Add waiter to S3 integration test to prevent failed bucket deletions on cleanup."
+  }
+]

tests/Integ/S3Context.php

@@ -85,7 +85,20 @@ public static function createTestBucket()
     public static function deleteTestBucket()
     {
         $client = self::getSdk()->createS3();
+        $result = $client->listObjectsV2([
+            'Bucket' => self::getResourceName()
+        ]);
+
+        // Delete objects & wait until no longer available before deleting bucket
         $client->deleteMatchingObjects(self::getResourceName(), '', '//');
+        foreach ($result['Contents'] as $object) {
+            $client->waitUntil('ObjectNotExists', [
+                'Bucket' => self::getResourceName(),
+                'Key' => $object['Key']
+            ]);
+        }
+
+        // Delete bucket and wait until bucket is no longer available
         $client->deleteBucket(['Bucket' => self::getResourceName()]);
         $client->waitUntil('BucketNotExists', [
             'Bucket' => self::getResourceName(),