+ def test_wikidata_links
+ ### Non-prefixed wikidata-tag (only one value allowed)
+
+ # Non-wikidata tag
+ links = wikidata_links("foo", "Test")
+ assert_nil links
+
+ # No URLs allowed
+ links = wikidata_links("wikidata", "http://www.wikidata.org/wiki/Q1")
+ assert_nil links
+
+ # No language-prefixes (as wikidata is multilanguage)
+ links = wikidata_links("wikidata", "en:Q1")
+ assert_nil links
+
+ # Needs a leading Q
+ links = wikidata_links("wikidata", "1")
+ assert_nil links
+
+ # No leading zeros allowed
+ links = wikidata_links("wikidata", "Q0123")
+ assert_nil links
+
+ # A valid value
+ links = wikidata_links("wikidata", "Q42")
+ assert_equal 1, links.length
+ assert_equal "//www.wikidata.org/wiki/Q42?uselang=en", links[0][:url]
+ assert_equal "Q42", links[0][:title]
+
+ # the language of the wikidata-page should match the current locale
+ I18n.locale = "zh-CN"
+ links = wikidata_links("wikidata", "Q1234")
+ assert_equal 1, links.length
+ assert_equal "//www.wikidata.org/wiki/Q1234?uselang=zh-CN", links[0][:url]
+ assert_equal "Q1234", links[0][:title]
+ I18n.locale = "en"
+
+ ### Prefixed wikidata-tags
+
+ # Not anything is accepted as prefix (only limited set)
+ links = wikidata_links("anything:wikidata", "Q13")
+ assert_nil links
+
+ # This for example is an allowed key
+ links = wikidata_links("operator:wikidata", "Q24")
+ assert_equal "//www.wikidata.org/wiki/Q24?uselang=en", links[0][:url]
+ assert_equal "Q24", links[0][:title]
+
+ # Another allowed key, this time with multiple values and I18n
+ I18n.locale = "dsb"
+ links = wikidata_links("brand:wikidata", "Q936;Q2013;Q1568346")
+ assert_equal 3, links.length
+ assert_equal "//www.wikidata.org/wiki/Q936?uselang=dsb", links[0][:url]
+ assert_equal "Q936", links[0][:title]
+ assert_equal "//www.wikidata.org/wiki/Q2013?uselang=dsb", links[1][:url]
+ assert_equal "Q2013", links[1][:title]
+ assert_equal "//www.wikidata.org/wiki/Q1568346?uselang=dsb", links[2][:url]
+ assert_equal "Q1568346", links[2][:title]
+ I18n.locale = "en"
+
+ # and now with whitespaces...
+ links = wikidata_links("subject:wikidata", "Q6542248 ;\tQ180\n ;\rQ364\t\n\r ;\nQ4006")
+ assert_equal 4, links.length
+ assert_equal "//www.wikidata.org/wiki/Q6542248?uselang=en", links[0][:url]
+ assert_equal "Q6542248 ", links[0][:title]
+ assert_equal "//www.wikidata.org/wiki/Q180?uselang=en", links[1][:url]
+ assert_equal "\tQ180\n ", links[1][:title]
+ assert_equal "//www.wikidata.org/wiki/Q364?uselang=en", links[2][:url]
+ assert_equal "\rQ364\t\n\r ", links[2][:title]
+ assert_equal "//www.wikidata.org/wiki/Q4006?uselang=en", links[3][:url]
+ assert_equal "\nQ4006", links[3][:title]
+ end
+