diff --git a/src/tests/Feature/DataMigrator/IMAPTest.php b/src/tests/Feature/DataMigrator/IMAPTest.php
index b0f67820..a82eb279 100644
--- a/src/tests/Feature/DataMigrator/IMAPTest.php
+++ b/src/tests/Feature/DataMigrator/IMAPTest.php
@@ -1,143 +1,151 @@
 <?php
 
 namespace Tests\Feature\DataMigrator;
 
 use App\DataMigrator\Account;
 use App\DataMigrator\Engine;
 use App\DataMigrator\Queue as MigratorQueue;
 use Tests\BackendsTrait;
 use Tests\TestCase;
 
 class IMAPTest extends TestCase
 {
     use BackendsTrait;
 
     /**
      * {@inheritDoc}
      */
     public function setUp(): void
     {
         parent::setUp();
 
         MigratorQueue::truncate();
     }
 
     /**
      * {@inheritDoc}
      */
     public function tearDown(): void
     {
         MigratorQueue::truncate();
 
         parent::tearDown();
     }
 
     /**
      * Test IMAP to IMAP migration
      *
      * @group imap
      */
     public function testInitialMigration(): void
     {
         $uri = \config('imap.uri');
 
+        if (strpos($uri, '://') === false) {
+            $uri = 'imap://' . $uri;
+        }
+
         $src = new Account(str_replace('://', '://john%40kolab.org:simple123@', $uri));
         $dst = new Account(str_replace('://', '://jack%40kolab.org:simple123@', $uri));
 
         // Initialize accounts
         $this->initAccount($src);
         $this->initAccount($dst);
 
         // Add some mail to the source account
         $this->imapAppend($src, 'INBOX', 'mail/1.eml');
         $this->imapAppend($src, 'INBOX', 'mail/2.eml', ['SEEN']);
         $this->imapCreateFolder($src, 'ImapDataMigrator');
         $this->imapCreateFolder($src, 'ImapDataMigrator/Test');
         $this->imapAppend($src, 'ImapDataMigrator/Test', 'mail/1.eml');
         $this->imapAppend($src, 'ImapDataMigrator/Test', 'mail/2.eml');
 
         // Clean up the destination folders structure
         $this->imapDeleteFolder($dst, 'ImapDataMigrator');
         $this->imapDeleteFolder($dst, 'ImapDataMigrator/Test');
 
         // Run the migration
         $migrator = new Engine();
         $migrator->migrate($src, $dst, ['force' => true, 'sync' => true]);
 
         // Assert the destination mailbox
         $dstFolders = $this->imapListFolders($dst);
         $this->assertContains('ImapDataMigrator', $dstFolders);
         $this->assertContains('ImapDataMigrator/Test', $dstFolders);
 
         // Assert the migrated messages
         $dstMessages = $this->imapList($dst, 'INBOX');
         $this->assertCount(2, $dstMessages);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync1@kolab.org>', $msg->messageID);
         $this->assertSame([], $msg->flags);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync2@kolab.org>', $msg->messageID);
         $this->assertSame(['SEEN'], array_keys($msg->flags));
 
         $dstMessages = $this->imapList($dst, 'ImapDataMigrator/Test');
         $this->assertCount(2, $dstMessages);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync1@kolab.org>', $msg->messageID);
         $this->assertSame([], $msg->flags);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync2@kolab.org>', $msg->messageID);
         $this->assertSame([], $msg->flags);
 
         // TODO: Test INTERNALDATE migration
     }
 
     /**
      * Test IMAP to IMAP incremental migration run
      *
      * @group imap
      * @depends testInitialMigration
      */
     public function testIncrementalMigration(): void
     {
         $uri = \config('imap.uri');
 
+        if (strpos($uri, '://') === false) {
+            $uri = 'imap://' . $uri;
+        }
+
         $src = new Account(str_replace('://', '://john%40kolab.org:simple123@', $uri));
         $dst = new Account(str_replace('://', '://jack%40kolab.org:simple123@', $uri));
 
         // Add some mails to the source account
         $srcMessages = $this->imapList($src, 'INBOX');
         $msg1 = array_shift($srcMessages);
         $msg2 = array_shift($srcMessages);
         $this->imapAppend($src, 'INBOX', 'mail/3.eml');
         $this->imapAppend($src, 'INBOX', 'mail/4.eml');
         $this->imapFlagAs($src, 'INBOX', $msg1->uid, ['SEEN']);
         $this->imapFlagAs($src, 'INBOX', $msg2->uid, ['UNSEEN', 'FLAGGED']);
 
         // Run the migration
         $migrator = new Engine();
         $migrator->migrate($src, $dst, ['force' => true, 'sync' => true]);
 
         // In INBOX two new messages and two old ones with changed flags
         // The order of messages tells us that there was no redundant APPEND+DELETE
         $dstMessages = $this->imapList($dst, 'INBOX');
         $this->assertCount(4, $dstMessages);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync1@kolab.org>', $msg->messageID);
         $this->assertSame(['SEEN'], array_keys($msg->flags));
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync2@kolab.org>', $msg->messageID);
         $this->assertSame(['FLAGGED'], array_keys($msg->flags));
         $ids = array_map(fn ($msg) => $msg->messageID, $dstMessages);
         $this->assertSame(['<sync3@kolab.org>','<sync4@kolab.org>'], $ids);
 
         // Nothing changed in the other folder
         $dstMessages = $this->imapList($dst, 'ImapDataMigrator/Test');
         $this->assertCount(2, $dstMessages);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync1@kolab.org>', $msg->messageID);
         $this->assertSame([], $msg->flags);
         $msg = array_shift($dstMessages);
         $this->assertSame('<sync2@kolab.org>', $msg->messageID);
         $this->assertSame([], $msg->flags);
     }
 }