Update tests to pass with commonmarker 2

test/tilt_commonmarkertemplate_test.rb

@@ -3,12 +3,16 @@
 checked_describe 'tilt/commonmarker' do
   it "preparing and evaluating templates on #render" do
     template = Tilt::CommonMarkerTemplate.new { |t| "# Hello World!" }
-    assert_equal "<h1>Hello World!</h1>\n", template.render
+    res = template.render
+    assert_includes ["<h1>Hello World!</h1>\n", "<h1><a href=\"#hello-world\" aria-hidden=\"true\" class=\"anchor\" id=\"hello-world\"></a>Hello World!</h1>\n"], template.render
   end
 
   it "can be rendered more than once" do
     template = Tilt::CommonMarkerTemplate.new { |t| "# Hello World!" }
-    3.times { assert_equal "<h1>Hello World!</h1>\n", template.render }
+    3.times do
+      res = template.render
+      assert_includes ["<h1>Hello World!</h1>\n", "<h1><a href=\"#hello-world\" aria-hidden=\"true\" class=\"anchor\" id=\"hello-world\"></a>Hello World!</h1>\n"], template.render
+    end
   end
 
   it "smartypants when :smartypants is set" do