editor#serialize accepts version parameter

src/js/editor/editor.js

@@ -40,6 +40,7 @@ import { DIRECTION } from 'mobiledoc-kit/utils/key';
 import { TAB, SPACE } from 'mobiledoc-kit/utils/characters';
 import assert from '../utils/assert';
 import MutationHandler from 'mobiledoc-kit/editor/mutation-handler';
+import { MOBILEDOC_VERSION } from 'mobiledoc-kit/renderers/mobiledoc';
 
 export const EDITOR_ELEMENT_CLASS_NAME = '__mobiledoc-editor';
 
@@ -392,8 +393,8 @@ class Editor {
     }
   }
 
-  serialize() {
-    return mobiledocRenderers.render(this.post);
+  serialize(version=MOBILEDOC_VERSION) {
+    return mobiledocRenderers.render(this.post, version);
   }
 
   removeAllViews() {

tests/unit/editor/editor-test.js

@@ -154,6 +154,26 @@ test('editor parses and renders mobiledoc format', (assert) => {
                    'serialized editor === mobiledoc');
 });
 
+test('#serialize serializes to MOBILEDOC_VERSION by default', (assert) => {
+  let mobiledoc2 = Helpers.mobiledoc.build(({post, markupSection, marker}) => {
+    return post([markupSection('p', [marker('abc')])]);
+  }, '0.2.0');
+  let mobiledoc3 = Helpers.mobiledoc.build(({post, markupSection, marker}) => {
+    return post([markupSection('p', [marker('abc')])]);
+  }, '0.3.0');
+  editor = Helpers.mobiledoc.renderInto(editorElement, ({post, markupSection, marker}) => {
+    return post([markupSection('p', [marker('abc')])]);
+  });
+
+  assert.deepEqual(editor.serialize('0.2.0'), mobiledoc2, 'serializes 0.2.0');
+  assert.deepEqual(editor.serialize('0.3.0'), mobiledoc3, 'serializes 0.3.0');
+
+  assert.throws(
+    () => editor.serialize('unknown'),
+    /Unknown version/
+  );
+});
+
 test('editor parses and renders html', (assert) => {
   editorElement.innerHTML = '<p>something here</p>';
   editor = new Editor({html: '<p>hello world</p>'});