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If you can investigate a solution, please open a PR

@ficu88 are you on a version of Node before v21? I'm on v20 and get the same behavior.
From the description in the PR that adds test runner support, the feature only works on Node v21 and above.

If that's correct, perhaps the "fix" is to amend the docs to mention the Node version requirements for the test runner integration.

Side note for the maintainer: Respectfully the two comments marked as off-topic were helpful for me. For those who can't upgrade to Node v21+ any workaround is useful!

are you on a version of Node before v21?

See the reproduction Node version:

❯ node -v
v18.20.3

If that's correct, perhaps the "fix" is to amend the docs to mention the Node version requirements for the test runner integration.

Happy to accept a PR, would you be open to working on one?

Respectfully the two comments marked as off-topic were helpful for me. For those who can't upgrade to Node v21+ any workaround is useful!

As a maintainer, my priority is to serve sponsors first, then contributors, and finally users.

For sponsors needing a workaround, I'm happy to offer support directly via the sponsors-only repo.

The Issues tab is a place for contributors to collaborate and fix bugs to benefit all tsx users, and it's distracting/unproductive when the thread is polluted with workaround noise by non-contributors.

Node LTS v.20 here

I run tests. For the following file tree:

src/
  commands.test.js

this works:

$ node --test src                       # is successfully executing  the `src/commands.test.js` tests

However for a similar TS location:

src/
  commands.test.ts

tsx doesn't find test files:

$ npx tsx --test src                    # is finding 0 tests

Yet if I pass the path it works:

$ npx tsx --test src/commands.test.ts   # is successfully executing  the `src/commands.test.ts` tests
$ npx tsx --test src/*.test.ts          # is successfully executing  the `src/commands.test.ts` tests

There is no such issue for Node v.21, but we're on the LTS Node v.20.

So it seems to be a test files discovery issue. Maybe it's worth adding the appropriate info to the docs here?

Yeah, feel free to open a PR to update the docs.

Explanation is in the PR: #410 (comment)