Property based test based on markdown-it (commonmark). #406
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Note that the test is currently failing, so merge with caution
This change checks that
markdown_it.render(turndown.render(html)) ~ html
and it currently finds various corner-cases:
"<em>foo<br/></em>bar" => "_foo \n_bar" => "_foo<br/>_bar"
"<h1>foo<br/></h1>bar" => "# foo \nbar" => "<h1>foo</h1>bar"
"<em>foo</em>bar" => "_foo_bar" => "_foo_bar"
"<em><em>foo</em></em>" => "__foo__" => "<strong>foo</strong>"
The test should be easy to extend to other scenarios that may prove to be problematic.