Fix "[object Object]__" in test successes output

[ahuggins-nhs]

When running tests, the namespace tag is correctly evaluated by xml2js into an object like:

      "namespace": {
        "$": {
          "xsi:nil": "true"
        }

which is then stringified instead of ignored.

Pull request #3 handles this issue and would fix our log output. Thanks!

[samgladstone]

I hit the same issue too! It was a real pain for my CI/CD pipeline. It's a real shame that this hasn't been fixed since 2016.

@stomita or @cristiand391 is it possible to get that PR merged? It's a simple fix that brings this log into in line with similar logs in the same function