I understand refactor/rename can't generally support dot imports, but
I think supporting dot import in context of moving package import paths
should be straightforward. Or am I missing anything?

I came up with a change, which should fixes the issue.
Given the command gomvpkg -from foo -to bar, the following files:

// $GOPATH/src/foo/foo.go
package foo
type T int

// $GOPATH/src/foo/foo_test.go
package foo_test
import "foo"
var _ foo.T

// $GOPATH/src/baz/baz_test.go
package baz_test
import "foo"
var _ foo.T

are now rewritten to

// $GOPATH/src/bar/bar.go
package bar
type T int

// $GOPATH/src/bar/bar_test.go
package bar_test
import "bar"
var _ bar.T

// $GOPATH/src/baz/baz_test.go
package baz_test
import "bar"
var _ bar.T

Can I send the change for further review?

@davidrjenni Please contribute changes using the process described at https://golang.org/doc/contribute.html . Thanks.

I sent a CL: https://golang.org/cl/12637

This was fixed in golang/tools@20d85c3.
I guess the issue can be closed.