}
		u := tt.ip.Unmap()
		if u != tt.wantUnmap {
			t.Errorf("Unmap(%q) = %v; want %v", tt.ip, u, tt.wantUnmap)
		}
	}
}

func TestPrefixMasked(t *testing.T) {
	tests := []struct {
		prefix Prefix
		masked Prefix
	}{
		{
			prefix: mustPrefix("192.168.0.255/24"),
			masked: mustPrefix("192.168.0.0/24"),
		},
		{