I am currently using vendor/ directory to locally vendor my dependencies.
go list -f '{{join .Deps "
"}}' ./... |grep -Eo 'vendor/.*'
This shows me all "build dependencies" used in my build, (that are used from vendor/). This feature is documented here: https://golang.org/cmd/go/#hdr-List_packages
But it doesn't include your "test dependencies"!
So to find my "test dependencies", I run this command:
$ go list -f '{{join .TestImports "
"}}' ./... |grep -Eo 'vendor/.*'
vendor/github.com/stretchr/testify/assert
...
It correctly list the "test imports", but it doesn't list the "dependencies" of those test imports.
For example, the vendor/github.com/stretchr/testify/assert directory listed above actually depends on vendor/github.com/pmezard/go-difflib/difflib (and a few other packages). This is not shown in the output above!
But if I run this command, it shows the dependencies of testify/assert:
$ go list -f '{{join .Deps "
"}}' ./vendor/github.com/stretchr/testify/assert | grep -Eo 'vendor/.*'
vendor/github.com/davecgh/go-spew/spew
vendor/github.com/pmezard/go-difflib/difflib
...
So it appears like I need to call go list -f '{{join .Deps " "}}' on all "test imports" to find "all test dependencies"?
Is there a more efficient way of doing this, ideally with a single go list call and some templating?
I am afraid there is no way to show all the recursive test dependencies using just one "go list".
You will need to use at least two:
go list -f '{{join .Deps "
"}}' `go list -f '{{join .TestImports " "}}' ./...`