Add search domains to parseIPAM, add test:

Search domains was missing from being parsed.
Some basic tests were added.

Signed-off-by: Jacob Weinstock <[email protected]>

internal/iso/iso.go

@@ -351,6 +351,13 @@ func parseIPAM(d *data.DHCP) string {
 
 		return ""
 	}()
+	ipam[7] = func() string {
+		if len(d.DomainSearch) > 0 {
+			return strings.Join(d.DomainSearch, ",")
+		}
+
+		return ""
+	}()
 	ipam[8] = func() string {
 		var ntp []string
 		for _, e := range d.NTPServers {

internal/iso/iso_test.go

@@ -8,6 +8,7 @@ import (
 	"net"
 	"net/http"
 	"net/http/httptest"
+	"net/netip"
 	"net/url"
 	"os"
 	"testing"
@@ -194,3 +195,39 @@ func (m *mockBackend) GetByIP(context.Context, net.IP) (*data.DHCP, *data.Netboo
 	}
 	return d, n, nil
 }
+
+func TestParseIPAM(t *testing.T) {
+	tests := map[string]struct {
+		input *data.DHCP
+		want  string
+	}{
+		"empty": {},
+		"only MAC": {
+			input: &data.DHCP{MACAddress: net.HardwareAddr{0xde, 0xed, 0xbe, 0xef, 0xfe, 0xed}},
+			want: "ipam=de-ed-be-ef-fe-ed::::::::",
+		},
+		"everything": {
+			input: &data.DHCP{
+				MACAddress: net.HardwareAddr{0xde, 0xed, 0xbe, 0xef, 0xfe, 0xed},
+				IPAddress: netip.AddrFrom4([4]byte{127, 0, 0, 1}),
+				SubnetMask: net.IPv4Mask(255, 255, 255, 0),
+				DefaultGateway: netip.AddrFrom4([4]byte{127, 0, 0, 2}),
+				NameServers: []net.IP{{1, 1, 1, 1}, {4, 4, 4, 4}},
+				Hostname: "myhost",
+				NTPServers: []net.IP{{129,6,15,28}, {129,6,15,29}},
+				DomainSearch: []string{"example.com", "example.org"},
+				VLANID: "400",
+			},
+			want:  "ipam=de-ed-be-ef-fe-ed:400:127.0.0.1:255.255.255.0:127.0.0.2:myhost:1.1.1.1,4.4.4.4:example.com,example.org:129.6.15.28,129.6.15.29",
+		},
+	}
+
+	for name, tt := range tests {
+		t.Run(name, func(t *testing.T) {
+			got := parseIPAM(tt.input)
+			if diff := cmp.Diff(tt.want, got); diff != "" {
+				t.Fatalf("diff: %v", diff)
+			}
+		})
+	}
+}