add test for markdown

test/chiya_web/markdown_test.exs

@@ -21,5 +21,11 @@ defmodule ChiyaWeb.MarkdownTest do
       assert html =~ "/note/foo"
       assert html =~ "MyFoo"
     end
+
+    test "renders a link to a not existing note with custom class" do
+      html = Markdown.render("[[foo]]")
+      assert html =~ "/note/foo"
+      assert html =~ "class=\"invalid\""
+    end
   end
 end