diff --git a/test/footnotes.test b/test/footnotes.test
index f22a7c3..25bd163 100644
--- a/test/footnotes.test
+++ b/test/footnotes.test
@@ -130,3 +130,22 @@ foo</p>
 </ol>
 </section>
 ```
+
+Definition labels are normalized too, so a wider gap in the definition
+still matches the reference:
+
+```
+[^a b]
+
+[^a  b]: foo
+.
+<p><a id="fnref1" href="#fn1" role="doc-noteref"><sup>1</sup></a></p>
+<section role="doc-endnotes">
+<hr>
+<ol>
+<li id="fn1">
+<p>foo<a href="#fnref1" role="doc-backlink">↩︎</a></p>
+</li>
+</ol>
+</section>
+```
diff --git a/test/smart.test b/test/smart.test
index 4b77226..b7b8695 100644
--- a/test/smart.test
+++ b/test/smart.test
@@ -106,6 +106,21 @@ Doubled quotes are treated as nested:
 <p>‘‘hi’’</p>
 ```
 
+With nothing between them there is nothing to enclose, so they don't
+pair and each takes its unmatched form:
+
+```
+''
+.
+<p>’’</p>
+```
+
+```
+""
+.
+<p>““</p>
+```
+
 Heuristics for determining openers and closers can
 be overridden using `{` and `}`: