Add ResolveAddr test cases

Author: Stefan-Ethernal

pkg/network/network.go renamed to network/network.go

@@ -0,0 +1,59 @@
+package network
+
+import (
+	"fmt"
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_ResolveAddr(t *testing.T) {
+	t.Parallel()
+
+	tcpAddrBuilder := func(t *testing.T, address string) *net.TCPAddr {
+		tcpAddr, err := net.ResolveTCPAddr("", address)
+		require.NoError(t, err)
+
+		return tcpAddr
+	}
+
+	cases := []struct {
+		name      string
+		address   string
+		defaultIP string
+		errMsg    string
+	}{
+		{
+			name:    "incorrect address",
+			address: "Foo Bar",
+			errMsg:  "failed to parse addr",
+		},
+		{
+			name:      "only port provided",
+			address:   ":8080",
+			defaultIP: "127.0.0.1",
+		},
+		{
+			name:      "both address and port provided",
+			address:   "255.0.255.0:8080",
+			defaultIP: "",
+		},
+	}
+
+	for _, c := range cases {
+		c := c
+		t.Run(c.name, func(t *testing.T) {
+			t.Parallel()
+
+			ipAddr, err := ResolveAddr(c.address, c.defaultIP)
+			if c.errMsg != "" {
+				require.ErrorContains(t, err, c.errMsg)
+			} else {
+				require.NoError(t, err)
+				expectedIPAddr := tcpAddrBuilder(t, fmt.Sprintf("%s%s", c.defaultIP, c.address))
+				require.Equal(t, expectedIPAddr, ipAddr)
+			}
+		})
+	}
+}