There wasn't really a test for sort keys, but we need those for
the Parsoid round-trip testing. So here they are!
Change-Id: If1fd948d1937872b9604b08c85b11595276f2808
</p>
!! end
+!! test
+Category with different sort key
+!! options
+cat
+!! input
+[[Category:MediaWiki User's Guide|Foo]]
+!! result
+<a href="/wiki/Category:MediaWiki_User%27s_Guide" title="Category:MediaWiki User's Guide">MediaWiki User's Guide</a>
+!! end
+
+!! test
+Category with identical sort key
+!! options
+cat
+!! input
+[[Category:MediaWiki User's Guide|MediaWiki User's Guide]]
+!! result
+<a href="/wiki/Category:MediaWiki_User%27s_Guide" title="Category:MediaWiki User's Guide">MediaWiki User's Guide</a>
+!! end
+
+!! test
+Category with empty sort key
+!! options
+cat
+pst
+!! input
+[[Category:MediaWiki User's Guide|]]
+!! result
+[[Category:MediaWiki User's Guide|MediaWiki User's Guide]]
+!! end
+
+!! test
+Category with empty sort key and parentheses
+!! options
+cat
+pst
+!! input
+[[Category:Foo (bar)|]]
+!! result
+[[Category:Foo (bar)|Foo]]
+!! end
+
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### Inter-language links
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