Integrate test mechanism to query webview DOM

[scholarsmate]

A package that can be used to query the webview can be found here: https://github.com/redhat-developer/vscode-extension-tester. It allows for many kinds of tests and automations, including webview DOMs (https://github.com/redhat-developer/vscode-extension-tester/wiki/WebView). It may also be useful for testing code completion. The bundled extest script appears to offer the same functionality as src/tests/runTests.ts but also integrates selenium web drivers.

[shanedell]

Currently this framework seems like its a work in progress and didn't seem incredibly reliable too me. Pushing this back to 1.4.0 and will possibly want to look into different frameworks.