Simplify testing feed_meta tag

spec/jekyll-feed_spec.rb

@@ -21,6 +21,8 @@
   end
   let(:site)     { Jekyll::Site.new(config) }
   let(:contents) { File.read(dest_dir("feed.xml")) }
+  let(:context)  { make_context(site: site) }
+  let(:feed_meta) { Liquid::Template.parse("{% feed_meta %}").render!(context, {}) }
   before(:each) do
     site.process
   end
@@ -196,17 +198,15 @@
     end
 
     it "renders the feed meta" do
-      index = File.read(dest_dir("index.html"))
-      expected = '<link type="application/atom+xml" rel="alternate" href="http://example.org/bass/feed.xml" title="My awesome site" />'
-      expect(index).to include(expected)
+      expected = 'href="http://example.org/bass/feed.xml"'
+      expect(feed_meta).to include(expected)
     end
   end
 
   context "feed meta" do
     it "renders the feed meta" do
-      index = File.read(dest_dir("index.html"))
       expected = '<link type="application/atom+xml" rel="alternate" href="http://example.org/feed.xml" title="My awesome site" />'
-      expect(index).to include(expected)
+      expect(feed_meta).to include(expected)
     end
   end
 
@@ -224,9 +224,8 @@
     end
 
     it "renders the feed meta with custom feed path" do
-      index = File.read(dest_dir("index.html"))
-      expected = '<link type="application/atom+xml" rel="alternate" href="http://example.org/atom.xml" title="My awesome site" />'
-      expect(index).to include(expected)
+      expected = 'href="http://example.org/atom.xml"'
+      expect(feed_meta).to include(expected)
     end
   end
 end

spec/spec_helper.rb

@@ -21,4 +21,8 @@ def source_dir(*files)
   def dest_dir(*files)
     File.join(DEST_DIR, *files)
   end
+
+  def make_context(registers = {})
+    Liquid::Context.new({}, {}, { site: site }.merge(registers))
+  end
 end