The "Source R Script" button should be "Run Tests" if the file contains only tests

[jmcphers]

Positron Dev Version: 2024.02.0 build 0
Code - OSS Version: 1.86.0
Commit: Unknown
Date: Unknown
Electron: 27.2.3
ElectronBuildId: undefined
Chromium: 118.0.5993.159
Node.js: 18.17.1
V8: 11.8.172.18-electron.0
OS: Darwin arm64 23.2.0

To reproduce, open an R package containing testthat tests, open an R file containing tests, and then click the Source button at the top.

The file is sourced, which just results in errors.

Expected behavior:

• This should run all the tests in the current file instead (e.g. the command Run Tests in Current File)
• Ideally the "Source" button would be replaced with a "Run Tests" button, too

Suggested by @hfrick.

[juliasilge]

Can we address this via #2085? cc @jgutman

[jgutman]

No I think this would be addressed separately, either way the extension would still need to specify a new when condition for the source script command versus run tests command. And I think that work would still carry over, if for example we decided to have the R extension show those action buttons in the breadcrumbs action bar instead

[jennybc]

Related to #1359.