Categorise test cases into test suite(s)

[cskeogh]

Meson test cases may belong to test suite(s). If so, in VSCode's "Testing" feature from the Activity Bar, add the test suite(s) as a parent item and add the test cases as children.

The user has the choice to run all tests belonging to a test suite. Will pass the test suite to the meson test command --suite. The option --suite is needed to run test cases that the meson config purposely excludes (for example, test suite "flaky").

Fixes #245

Quote the "test case" in the meson command, so can run test cases with a space in the name. The quotes are needed because cp.ExecFileOptions sets shell=true.

Fixes #256

[cskeogh]

Using the gtk project, showing the test suite(s):

[tristan957]

Thanks for the PR. I will try to test and review it this week.

[tristan957]

What do you think of #237? Should I merge that one first?

[cskeogh]

Updated the PR to fix the review comments.

Note the PR does have some limitations:

1. Gtk's test case "about state" is in 2 test suites "gtk+:a11y" and "gtk+:flaky". This PR shows "about state" correctly in both test suites, but they are separate instances of TestItem. Ideally, "about state" would be one instance of TestItem, so that the failure icon shows on both (see screenshot yellow highlight). But VSCode doesn't support one TestItem with 2 parents. I tried.
   
   

2. The user can run the test suite, which will correctly run all test cases belonging to the test suite. But the children TestItem do not show the success / failure icons (see screenshot yellow highlight). Only the test suite shows success / failure. In the below example, I ran test suite "gtk+:gdk" and 7 test cases passed and 1 failed:
   

Ok:                 7   
Expected Fail:      0   
Fail:               1   
Unexpected Pass:    0   
Skipped:            0   
Timeout:            0 

[tristan957]

Thanks for explaining the limitations. I see that there is this function. Do we have access to the test runs, so if someone runs a suite, we can properly annotate the test? https://vscode-api.js.org/interfaces/vscode.TestRun.html#passed

[cskeogh]

I'm working on resolving the limitations. Closing this PR until I resolve.

[tristan957]

Alright. Really appreciate you looking into this more!