Verifies that 'InsertNestedUnorderedList' and 'InsertNestedOrderedList' work as expected with pre elements. This test requires WebKitTestRunner or DumpRenderTree.

After inserting a list inside the pre:
| "
    "
| <pre>
|   id="pre"
|   "Hello"
|   <ul>
|     <li>
|       id="foo"
|       "foo"
|     <ol>
|       <li>
|         <#selection-caret>
|   "world"
| "
"

After inserting a list around the pre:
| "
    "
| <pre>
|   id="pre"
|   <ul>
|     <li>
|       "<#selection-caret>Hello"
|       <br>
|     <li>
|       id="foo"
|       "foo"
|     <ol>
|       <li>
|   "world"
| "
"