continue
		}

		if want := tt.a[len(tt.a)-1] + "z"; string(x) != want {
			t.Errorf("last appended result was %s; want %s", x, want)
		}

		s := Join(a, []byte(tt.sep))
		if string(s) != tt.s {
			t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
		}
		if tt.n < 0 {
			b := Split([]byte(tt.s), []byte(tt.sep))
			if !reflect.DeepEqual(a, b) {