testCases := []struct {
		tcase      string
		route      string
		count      int
		expected   *Route
		errStrFrag string
	}{
		{"gatewayfirst", gatewayfirst, 1, &ipv4Route, ""},
		{"gatewaymiddle", gatewaymiddle, 1, &ipv4Route, ""},
		{"gatewaylast", gatewaylast, 1, &ipv4Route, ""},
		{"no routes", nothing, 0, nil, ""},
		{"badDestination", badDestination, 0, nil, "invalid IPv4"},