Prevent empty classes in ansi2html conversion

Currently we write out empty CSS classes (`class=""`) every time we
create a new tag. This adds 9 unnecessary bytes per span element. In a
recent trace, I have counted 11950 span elements. So we transported 105
unnecessary kilobytes!

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/support/shared_examples/ci_trace_shared_examples.rb b/spec/support/shared_examples/ci_trace_shared_examples.rb
index 6fd4b14d51d..e2b4b50d41d 100644
--- a/spec/support/shared_examples/ci_trace_shared_examples.rb
+++ b/spec/support/shared_examples/ci_trace_shared_examples.rb
@@ -7,11 +7,11 @@ shared_examples_for 'common trace features' do
     end
 
     it "returns formatted html" do
-      expect(trace.html).to eq("<span class=\"\">12<br/><span class=\"\">34</span></span>")
+      expect(trace.html).to eq("<span>12<br/>34</span>")
     end
 
     it "returns last line of formatted html" do
-      expect(trace.html(last_lines: 1)).to eq("<span class=\"\">34</span>")
+      expect(trace.html(last_lines: 1)).to eq("<span>34</span>")
     end
   end