tree b675192aa14fe3246358b810122e1371d3303504
parent 91f874188ecec6ad00e1e9d7fe0d94280aff559e
author Russ Cox <rsc@golang.org> 1531356557 -0400
committer Russ Cox <rsc@golang.org> 1531423493 +0000

cmd/go: add local module proxy to make tests faster

Because "go get" with modules enabled allows use of a proxy,
we can run a proxy in the test and serve modules from local files,
which makes the tests not depend on remote network servers
and run significantly faster, speeding development.

The proxy serves modules from the testdata/mod directory,
which holds one txtar archive per module. See testdata/mod/README.

Reduces time for 'go test -run=^TestMod' from 115s to 11.9s.
Still longer than I would like but significantly better.

Change-Id: I1b8367b208a02549a44e91e4ea5c5fb9003123ae
Reviewed-on: https://go-review.googlesource.com/123361
Reviewed-by: Bryan C. Mills <bcmills@google.com>