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

On 20/01/25, Sean Liao (s...@liao.dev) wrote:
> 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
> 
> On Fri, Jan 10, 2025 at 8:51 AM Rory Campbell-Lange
> <r...@campbell-lange.net> wrote:
> >
> > 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/mailboxoperator@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
> >
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