add unit tests for link_text_with_entity

spec/autolinking_spec.rb

@@ -665,6 +665,48 @@ def original_text; "Single char file ext http://www.bestbuy.com/site/Currie+Tech
     end
   end
 
+  describe "link_text_with_entity" do
+    before do
+      @linker = TestAutolink.new
+    end
+
+    it "should use display_url and expanded_url" do
+      @linker.send(:link_text_with_entity,
+        {
+          :url => "http://t.co/abcde",
+          :display_url => "twitter.com",
+          :expanded_url => "http://twitter.com/"},
+        {:invisible_tag_attrs => "class='invisible'"}).gsub('"', "'").should == "<span class='tco-ellipsis'><span class='invisible'>&nbsp;</span></span><span class='invisible'>http://</span><span class='js-display-url'>twitter.com</span><span class='invisible'>/</span><span class='tco-ellipsis'><span class='invisible'>&nbsp;</span></span>";
+    end
+
+    it "should correctly handle display_url ending with '…'" do
+      @linker.send(:link_text_with_entity,
+        {
+          :url => "http://t.co/abcde",
+          :display_url => "twitter.com…",
+          :expanded_url => "http://twitter.com/abcdefg"},
+        {:invisible_tag_attrs => "class='invisible'"}).gsub('"', "'").should == "<span class='tco-ellipsis'><span class='invisible'>&nbsp;</span></span><span class='invisible'>http://</span><span class='js-display-url'>twitter.com</span><span class='invisible'>/abcdefg</span><span class='tco-ellipsis'><span class='invisible'>&nbsp;</span>…</span>";
+    end
+
+    it "should correctly handle display_url starting with '…'" do
+      @linker.send(:link_text_with_entity,
+        {
+          :url => "http://t.co/abcde",
+          :display_url => "…tter.com/abcdefg",
+          :expanded_url => "http://twitter.com/abcdefg"},
+        {:invisible_tag_attrs => "class='invisible'"}).gsub('"', "'").should == "<span class='tco-ellipsis'>…<span class='invisible'>&nbsp;</span></span><span class='invisible'>http://twi</span><span class='js-display-url'>tter.com/abcdefg</span><span class='invisible'></span><span class='tco-ellipsis'><span class='invisible'>&nbsp;</span></span>";
+    end
+
+    it "should not create spans if display_url and expanded_url are on different domains" do
+      @linker.send(:link_text_with_entity,
+        {
+          :url => "http://t.co/abcde",
+          :display_url => "pic.twitter.com/xyz",
+          :expanded_url => "http://twitter.com/foo/statuses/123/photo/1"},
+        {:invisible_tag_attrs => "class='invisible'"}).gsub('"', "'").should == "pic.twitter.com/xyz"
+    end
+  end
+
   describe "html_escape" do
     before do
       @linker = TestAutolink.new