nijie: don't return bogus artists when artist finder finds no match.

app/models/artist.rb

@@ -49,6 +49,7 @@ class Artist < ApplicationRecord
           break if url =~ /deviantart\.net\//i
           break if url =~ %r!\Ahttps?://(?:mobile\.)?twitter\.com/\Z!i
           break if url =~ %r!pawoo\.net/(?:web/)?$!i
+          break if url =~ %r!\Ahttps?://(pic\d+\.)?nijie\.info/!i
         end
 
         artists.inject({}) {|h, x| h[x.name] = x; h}.values.slice(0, 20)

test/unit/artist_test.rb

@@ -310,6 +310,22 @@ class ArtistTest < ActiveSupport::TestCase
       end
     end
 
+    context "when finding nijie artists" do
+      setup do
+        FactoryGirl.create(:artist, :name => "evazion", :url_string => "http://nijie.info/members.php?id=236014")
+        FactoryGirl.create(:artist, :name => "728995",  :url_string => "http://nijie.info/members.php?id=728995")
+      end
+
+      should "find the artist" do
+        assert_artist_found("evazion", "http://nijie.info/view.php?id=218944")
+        assert_artist_found("728995",  "http://nijie.info/view.php?id=213043")
+      end
+
+      should "return nothing for unknown nijie artists" do
+        assert_artist_not_found("http://nijie.info/view.php?id=157953")
+      end
+    end
+
     should "normalize its other names" do
       artist = FactoryGirl.create(:artist, :name => "a1", :other_names_comma => "aaa, bbb, ccc ddd")
       assert_equal("aaa, bbb, ccc_ddd", artist.other_names_comma)