Example tests: access to module testdata files

[Rory Campbell-Lange]

Hi. I have written a small package with an example which runs fine locally, but doesn't work through the web interface of either my local godoc or pkg.go.dev.

https://pkg.go.dev/github.com/rorycl/mailbox...@v0.0.4#example-package

The test attempts to access files in the testdata directories of submodules in the package. I imagine this is not permitted for security reasons.

I'd be grateful for a pointer to the restrictions on web-runnable example tests, and to learn if there is way of providing files to my example programme.

Many thanks,
Rory

[Charles Pustejovsky]

It looks like you're code is failing because you're trying to open from

Your operator is opening new Mboxs and the paths you pass in are assuming the main.go is called from that directory.

https://github.com/rorycl/mailboxoperator/blob/main/mbox/mbox.go#L28

I'm not sure how you would resolve this. Since there hasn't been an answer on here, I'd recommend posting the question to the testing channel of the Gopher Slack

[Sean Liao]

The playground, which also serves pkg.go.dev examples. runs in an
isolated environment with just the built test/example binary, without
the source code.
Consider embedding any files you need with "embed" and accessing them
through io/fs.FS rather than through os calls.

- sean

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[Rory Campbell-Lange]

That's a really helpful comment. I'll give the embed/fs.FS approach a go -- thank you.