Fix unittest

Author: Pieter Cappelle

app/code/Magento/Cms/Test/Unit/Helper/Wysiwyg/ImagesTest.php

@@ -450,7 +450,7 @@ public function testGetImageHtmlDeclaration($baseUrl, $fileName, $isUsingStaticU
 
         $this->backendDataMock->expects($this->any())
             ->method('getUrl')
-            ->with('cms/wysiwyg/directive', ['___directive' => $directive])
+            ->with('cms/wysiwyg/directive', ['___directive' => $directive, '_escape_params' => false])
             ->willReturn($directive);
 
         $this->assertEquals($expectedHtml, $this->imagesHelper->getImageHtmlDeclaration($fileName));