Add test for correct encoding of already encoded URIs.

The resulting URI should be double-escaped.

extended-tests.json

@@ -18,6 +18,7 @@
             "lat"          : -122.427,
             "group_id"     : "12345",
             "query"        : "PREFIX dc: <http://purl.org/dc/elements/1.1/> SELECT ?book ?who WHERE { ?book dc:creator ?who }",
+            "uri"          : "http://example.org/?uri=http%3A%2F%2Fexample.org%2F",
             "word"         : "drücken",
             "Stra%C3%9Fe"  : "Grüner Weg",
             "random"       : "šö䟜ñꀣ¥‡ÑÒÓÔÕÖ×ØÙÚàáâãäåæçÿ",
@@ -44,6 +45,7 @@
             ["/loc{?long,lat}" , "/loc?long=37.76&lat=-122.427"],
             ["/base{/group_id,first_name}/pages{/page,lang}{?format,q}","/base/12345/John/pages/5/en?format=json&q=URI%20Templates"],
             ["/sparql{?query}", "/sparql?query=PREFIX%20dc%3A%20%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%20SELECT%20%3Fbook%20%3Fwho%20WHERE%20%7B%20%3Fbook%20dc%3Acreator%20%3Fwho%20%7D"],
+            ["/go{?uri}", "/go?uri=http%3A%2F%2Fexample.org%2F%3Furi%3Dhttp%253A%252F%252Fexample.org%252F"],
             ["/service{?word}", "/service?word=dr%C3%BCcken"],
             ["/lookup{?Stra%C3%9Fe}", "/lookup?Stra%C3%9Fe=Gr%C3%BCner%20Weg"],
             ["{random}" , "%C5%A1%C3%B6%C3%A4%C5%B8%C5%93%C3%B1%C3%AA%E2%82%AC%C2%A3%C2%A5%E2%80%A1%C3%91%C3%92%C3%93%C3%94%C3%95%C3%96%C3%97%C3%98%C3%99%C3%9A%C3%A0%C3%A1%C3%A2%C3%A3%C3%A4%C3%A5%C3%A6%C3%A7%C3%BF"],