}
				} else if wantError {
					t.Fatal("unexpected success")
				}
			})
		}
	}
}

func shardMatch(name string) bool {
	if *shards <= 1 {
		return true
	}
	h := fnv.New32()
	io.WriteString(h, name)
	return int(h.Sum32()%uint32(*shards)) == *shard
}

func goFiles(t *testing.T, dir string) []string {
	f, err := os.Open(filepath.Join(testenv.GOROOT(t), "test", dir))
	if err != nil {