Hi,

Every 6 months or so a developer on our team will inadvertently import
a package that establishes an import chain from a production binary to
the 'testing' package. This is a potential problem for a few reasons.
It makes the binaries larger, it pollutes the cli flags with testing
flags, it increases the risk that test code might actually get run,
and it includes package Init() functions that are ordinarily only
included in tests.

We could build some relatively simple tests to check binaries for
this. For example we could check the output of `$BIN --help` for the
existing of test flags.

I'm wondering if the go tooling can/should do something to prevent or
detect this? Can/should this be a `go vet` rule to detect main
packages that end up importing 'testing'? Or would this make sense as
an external tool, and does one already exist?

Thanks!

brian

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