You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client_test.go
    path of file: ./repos/grafana/pkg/services/anonymous/anonimpl
    
    the code of the file until where you have to start completion: package anonimpl

import (
	"context"
	"fmt"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/grafana/grafana/pkg/infra/log"
	"github.com/grafana/grafana/pkg/services/anonymous/anontest"
	"github.com/grafana/grafana/pkg/services/authn"
	"github.com/grafana/grafana/pkg/services/org"
	"github.com/grafana/grafana/pkg/services/org/orgtest"
	"github.com/grafana/grafana/pkg/setting"
)

func TestAnonymous_Authenticate(t *testing.T) {
	type TestCase struct {
		desc string
		org  *org.Org
		cfg  *setting.Cfg
		err  error
	}

	tests := []TestCase{
		{
			desc: "should success with valid org configured",
			org:  &org.Org{ID: 1, Name: "some org"},
			cfg: &setting.Cfg{
				Anonymo
    
func TestAnonymous_Authenticate(t *testing.T) {
	type TestCase struct {
		desc string
		org  *org.Org
		cfg  *setting.Cfg
		err  error
	}

	tests := []TestCase{
		{
			desc: "should success with valid org configured",
			org:  &org.Org{ID: 1, Name: "some org"},
			cfg: &setting.Cfg{
				AnonymousOrgName: "some org",
				AnonymousOrgRole: "Viewer",
			},
		},
		{
			desc: "should return error if any error occurs during org lookup",
			err:  fmt.Errorf("some error"),
			cfg: &setting.Cfg{
				AnonymousOrgName: "some org",
				AnonymousOrgRole: "Viewer",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.desc, func(t *testing.T) {
			c := Anonymous{
				cfg:               tt.cfg,
				log:               log.NewNopLogger(),
				orgService:        &orgtest.FakeOrgService{ExpectedOrg: tt.org, ExpectedError: tt.err},
				anonDeviceService: anontest.NewFakeService(),
			}

			identity, err := c.Authenticate(context.Background(), &authn.Request{})
			if err != nil {
				require.Error(t, err)
				require.Nil(t, identity)
			} else {
				require.Nil(t, err)

				assert.Equal(t, authn.AnonymousNamespaceID, identity.ID)
				assert.Equal(t, tt.org.ID, identity.OrgID)
				assert.Equal(t, tt.org.Name, identity.OrgName)
				assert.Equal(t, tt.cfg.AnonymousOrgRole, string(identity.GetOrgRole()))
			}
		})
	}
}