message: Golang: Make sure testkeysethandle can only be used in test code.
  GitOrigin-RevId:
diff: @@ -6,6 +6,7 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
  go_library(
  name = "go_default_library",
  + testonly = 1,
  srcs = ["testkeysethandle.go"],
  importpath = "github.com/google/tink/go/testkeysethandle",
  deps = [
  