cmd/pack: dump output of command of "go env" command in test

Get more information to help understand build failure on Plan 9.
Also Windows.
(TestHello is failing because GOCHAR does not appear in output.
What does?)

Update #7362

LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/66070044

diff --git a/src/cmd/pack/pack_test.go b/src/cmd/pack/pack_test.go
index 427ba8b30da7cef0a2ef65c268905fbef014afb6..a073fa45210b3febb98de36ac92ccc7729e71167 100644 (file)
--- a/src/cmd/pack/pack_test.go
+++ b/src/cmd/pack/pack_test.go
@@ -195,7 +195,7 @@ func TestHello(t *testing.T) {
        out := run("go", "env")
        i := strings.Index(out, "GOCHAR=\"")
        if i < 0 {
-               t.Fatal("cannot find GOCHAR in 'go env' output")
+               t.Fatal("cannot find GOCHAR in 'go env' output:\n", out)
        }
        char := out[i+8 : i+9]
        run("go", "build", "cmd/pack") // writes pack binary to dir