Hi VS Code dev here 👋

Some general feedback regarding the Python test viewlet:

1. Idealy VS Code will provide the Test viewlet functionality so the Python can just plugin a view. This depends on Test Runner Viewlet with an Extension API to plug into [Enhancement Request] vscode#9505
2. Icons are out of style: they look like Visual Studio icons and not Visual Studio code icons. Show test output is using a wrong icon which looks like an termian input. Output is readonly thus I think this icon does not fit
3. Name of the view is PYTHON, it should be Python
4. Consider to provide some useful actions and not just an empty view when there are no tests