".net.":                   ".net",
	"a..":                     "a.",
	"b.a..":                   "b.a.",
	"weird.stuff...":          "weird.stuff..",
	"[bad.unmatched.bracket:": "error",
}

func TestCanonicalHost(t *testing.T) {
	for h, want := range canonicalHostTests {
		got, err := canonicalHost(h)
		if want == "error" {
			if err == nil {
				t.Errorf("%q: got %q and nil error, want non-nil", h, got)
			}