add support for nico seiga manga (fixes #4060)

test/unit/sources/nico_seiga_manga_test.rb

@@ -0,0 +1,23 @@
+require 'test_helper'
+
+module Sources
+  class NicoSeigaTest < ActiveSupport::TestCase
+    context "The source site for nico seiga" do
+      setup do
+        @site = Sources::Strategies.find("http://seiga.nicovideo.jp/watch/mg316708", "http://seiga.nicovideo.jp/watch/mg316708")
+      end
+
+      should "find the image urls" do
+        assert_equal(["https://seiga.nicovideo.jp/image/source/8100968", "https://seiga.nicovideo.jp/image/source/8100969", "https://seiga.nicovideo.jp/image/source/8100970", "https://seiga.nicovideo.jp/image/source/8100971", "https://seiga.nicovideo.jp/image/source/8100972", "https://seiga.nicovideo.jp/image/source/8100973", "https://seiga.nicovideo.jp/image/source/8100974", "https://seiga.nicovideo.jp/image/source/8100975"], @site.image_urls)
+      end
+
+      should "find the page url" do
+        assert_equal("http://seiga.nicovideo.jp/watch/mg316708", @site.page_url)
+      end
+
+      should "find the artist name" do
+        assert_not_nil(@site.artist_name)
+      end
+    end
+  end
+end

test/unit/sources/nico_seiga_test.rb

@@ -6,6 +6,7 @@ module Sources
       setup do
         @site_1 = Sources::Strategies.find("http://lohas.nicoseiga.jp/o/910aecf08e542285862954017f8a33a8c32a8aec/1433298801/4937663")
         @site_2 = Sources::Strategies.find("http://seiga.nicovideo.jp/seiga/im4937663")
+        @site_3 = Sources::Strategies.find("http://seiga.nicovideo.jp/watch/mg376206")
       end
 
       should "get the profile" do
@@ -59,6 +60,12 @@ module Sources
         assert_match(full_image_url, site.image_url)
         assert_match(full_image_url, site.canonical_url)
       end
+
+      context "for a manga page" do
+        should "not try to find the image url" do
+          assert_nil(@site_3.image_url)
+        end
+      end
     end
   end
 end