Unit tests: dnsserver/https (#5251)

- Added unit tests for dnsserver/https.
Signed-off-by: nathannaveen <42319948+nathannaveen@users.noreply.github.com>

core/dnsserver/https_test.go

+package dnsserver
+
+import (
+	"net"
+	"net/http"
+	"reflect"
+	"testing"
+)
+
+func TestDoHWriter_LocalAddr(t *testing.T) {
+	tests := []struct {
+		name  string
+		laddr net.Addr
+		want  net.Addr
+	}{
+		{
+			name:  "LocalAddr",
+			laddr: &net.TCPAddr{},
+			want:  &net.TCPAddr{},
+		},
+		{
+			name:  "LocalAddr",
+			laddr: &net.UDPAddr{},
+			want:  &net.UDPAddr{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			d := &DoHWriter{
+				laddr: tt.laddr,
+			}
+			if got := d.LocalAddr(); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("LocalAddr() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestDoHWriter_RemoteAddr(t *testing.T) {
+	tests := []struct {
+		name  string
+		want  net.Addr
+		raddr net.Addr
+	}{
+		{
+			name:  "RemoteAddr",
+			want:  &net.TCPAddr{},
+			raddr: &net.TCPAddr{},
+		},
+		{
+			name:  "RemoteAddr",
+			want:  &net.UDPAddr{},
+			raddr: &net.UDPAddr{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			d := &DoHWriter{
+				raddr: tt.raddr,
+			}
+			if got := d.RemoteAddr(); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("RemoteAddr() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestDoHWriter_Request(t *testing.T) {
+	tests := []struct {
+		name    string
+		request *http.Request
+		want    *http.Request
+	}{
+		{
+			name:    "Request",
+			request: &http.Request{},
+			want:    &http.Request{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			d := &DoHWriter{
+				request: tt.request,
+			}
+			if got := d.Request(); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Request() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}