Pass test data to nested struct

I am trying to get to grips with testing in Go and I have hit a bit of a stumbling block.

I have the following code:

package main

import (
	"fmt"
	"testing"
)

type ConformanceChange struct {
	Val   string
	Proxy struct {
		Address string
		Port    string
	}
}

func Item(conformance ConformanceChange) string {
	service := conformance.Proxy.Address
	services := map[string]string{
		"Word": "Now",
	}
	service = services[service]
	fmt.Println("Service: ", service)
	return service
}

func Test_Item(t *testing.T) {
	type args struct {
		conformance ConformanceChange
	}
	tests := []struct {
		name string
		args args
		want string
	}{
		// TODO: Add test cases.
		{name: "empty", args: args{
			conformance: ConformanceChange{},
		}, want: ""},
		{name: "value", args: args{
			conformance: ConformanceChange{Val: "test", Proxy: {Address: "d", Port: "d"}},
		}, want: ""},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := Item(tt.args.conformance); got != tt.want {
				t.Errorf("getService() = %v, want %v", got, tt.want)
			}
		})
	}
}

I would like to be able to pass data to ConformanceChange.Proxy.Address when running my tests. I can pass data to ConformanceChange.Val and it works.

Can someone please let me know the correct syntax for this?

Update
The solution provided by Bless worked.

Following on from this, if I had the following code:

package main

import (
	"fmt"
	"testing"
)

type ConformanceChange struct {
	Val   string
	Proxy struct {
		Address string `json:address`
		Port    string `json:port`
	}
}

func Item(conformance ConformanceChange) string {
	service := conformance.Proxy.Address
	services := map[string]string{
		"Word": "Now",
	}
	service = services[service]
	fmt.Println("Service: ", service)
	return service
}

func Test_Item(t *testing.T) {
	type args struct {
		conformance ConformanceChange
	}
	tests := []struct {
		name string
		args args
		want string
	}{
		// TODO: Add test cases.
		{name: "empty", args: args{
			conformance: ConformanceChange{},
		}, want: ""},
		{name: "value", args: args{
			conformance: ConformanceChange{Val: "test", Proxy: struct {
				Port    string `json:port`
			}(struct {
				Port    string
			}{Port: "d"})},
		}, want: ""},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := Item(tt.args.conformance); got != tt.want {
				t.Errorf("getService() = %v, want %v", got, tt.want)
			}
		})
	}
}

I don't want to specify all the fields in my test (as it could get messy), can I just specify the one? In the above code it fails with:
Cannot use 'struct { Port string json:port }(struct { Port string }{Port: "d"})' (type struct {...}) as the type struct {...}

When creating a struct value, the struct should be specified.

{name: "value", args: args{
    conformance: ConformanceChange{Val: "test", Proxy: struct{Address string; Port string}{Address: "d", Port: "d"}},
}, want: ""},

To avoid repetition, you could define a Proxy struct

type Proxy struct {
    Address string
    Port    string
}

type ConformanceChange struct {
    Val   string
    Proxy Proxy
}

and then refer to it when initialising the struct value

{name: "value", args: args{
    conformance: ConformanceChange{Val: "test", Proxy: Proxy{Address: "d", Port: "d"}},
}, want: ""},