I wrote a little bit here: https://chatbotslife.com/alexa-are-you-ok-test-automation-for-alexa-skills-53088429d53

But we don’t consider this webspeech thing as something useful in test automation — it is loud and takes too much time. We prefer the approach shown here: https://chatbotslife.com/testing-alexa-skills-with-avs-mocha-and-botium-f6c22549f66e