Update Posts transformer to extract images by splitting the DOM tree

tests/unit/Newsletter/Editor/StructureTransformerTest.php

@@ -0,0 +1,30 @@
+<?php
+namespace MailPoet\Test\Newsletter\Editor;
+
+use pQuery;
+use MailPoet\Newsletter\Editor\StructureTransformer;
+
+class StructureTransformerTest extends \MailPoetTest {
+
+  function _before() {
+    $this->transformer = new StructureTransformer();
+  }
+
+  function testItExtractsImagesAsImageBlocks() {
+    $html = '<p><i>italic</i><em>previous text<a href="#mylink"><img src="#myimage" /></a>next text</em><b>bolded</b></p>';
+
+    $blocks = $this->transformer->transform($html, false);
+
+    expect($blocks)->count(3);
+    expect($blocks[0]['type'])->equals('text');
+    expect($blocks[0]['text'])->equals('<p><i>italic</i><em>previous text</em></p>');
+
+    expect($blocks[1]['type'])->equals('image');
+    expect($blocks[1]['src'])->equals('#myimage');
+    expect($blocks[1]['link'])->equals('#mylink');
+
+    expect($blocks[2]['type'])->equals('text');
+    expect($blocks[2]['text'])->equals('<p><em>next text</em><b>bolded</b></p>');
+  }
+
+}