Discover test per folder icon is missing in multi-root workspace after upgrade

[memeplex]

Environment data

• VS Code version: 1.39.0
• Extension version: 2019.10.41019
• OS and version: Ubuntu 19.04
• Python version: python 3.7.3
• Type of virtual environment used: N/A
• Relevant/affected Python packages and their versions: unittest
• Jedi or Language Server?: Jedi

Expected behaviour

Hovering over a project in the unit test view of a multi-root workspace shows a Discovery button as in the following screenshot for the previous version of the extension:

Actual behaviour

In the new version that's not the case anymore. Maybe it's related to this #7859 regression in the unit test feature.

Steps to reproduce:

1. Create a multi-root project
2. Add some tests to each project
3. Set the testing framework to unittest
4. Hover over one of the projects as in the screenshot

[kimadeline]

Hi @memeplex 👋 Thank you for reporting this issue.

I can confirm that I can reproduce it on the latest version of the extension (I used pytest instead of unittest), and running git bisect shows that this was introduced in 9f69bf7.

Note: After 9f69bf7 none of the icons were being displayed on hover:

But 1fe697a introduced some changes that fixed the leaf icons, sadly not the folder ones.

[brettcannon]

This has been fixed in our upcoming, new test provider.

[memeplex]

Cool, thanks!