Add new test with an https-served WSDL URL

[bfitzpat]

@apupier brought this up in #37
"What do you think to add a test using an https URL? Not sure how complicated it is to provide the service used in test through both http and https."

The simple service is just http. Looks like this link has some ideas on adding https support - https://www.alexkras.com/simple-https-test-server-using-node-js/.