test py_unit_adapter repaired

spec/lib/py_unit_adapter_spec.rb

@@ -4,11 +4,12 @@ describe PyUnitAdapter do
   let(:adapter) { described_class.new }
   let(:count) { 42 }
   let(:failed) { 25 }
+  let(:error_messages) { [] }
   let(:stderr) { "Ran #{count} tests in 0.1s\n\nFAILED (failures=#{failed})" }
 
   describe '#parse_output' do
     it 'returns the correct numbers' do
-      expect(adapter.parse_output(stderr: stderr)).to eq(count: count, failed: failed)
+      expect(adapter.parse_output(stderr: stderr)).to eq(count: count, failed: failed, error_messages: error_messages)
     end
   end
 end