go func() {
		out, err := cmd.CombinedOutput()
		t.Logf("%v: %v\n%s", cmd, err, out)
		close(done)
	}()

	t.Logf("running in background: %v", cmd)
	<-done
}

func TestAbsPathExec(t *testing.T) {
	testenv.MustHaveExec(t)
	testenv.MustHaveGoBuild(t) // must have GOROOT/bin/gofmt, but close enough

	// A simple exec of a full path should work.