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: daemon_windows_test.go
    path of file: ./repos/moby/daemon
    
    the code of the file until where you have to start completion: //go:build windows

package daemon // import "github.com/docker/docker/daemon"

import (
	"strings"
	"testing"

	"golang.org/x/sys/windows/svc/mgr"
)

const existingService = "Power"

func TestEnsureServicesExist(t *testing.T) {
	m, err := mgr.Connect()
	if err != nil {
		t.Fatal("failed to connect to service manager, this test needs admin")
	}
	defer m.Disconnect()
	s, err := m.OpenService(existingService)
	if err != nil {
		t.Fat
    
func TestEnsureServicesExistErrors(t *testing.T) {
	m, err := mgr.Connect()
	if err != nil {
		t.Fatal("failed to connect to service manager, this test needs admin")
	}
	defer m.Disconnect()
	s, err := m.OpenService(existingService)
	if err != nil {
		t.Fatalf("expected to find known inbox service %q, this test needs a known inbox service to run correctly", existingService)
	}
	defer s.Close()

	for _, testcase := range []struct {
		input         []string
		expectedError string
	}{
		{
			input:         []string{"daemon_windows_test_fakeservice"},
			expectedError: "failed to open service daemon_windows_test_fakeservice",
		},
		{
			input:         []string{"daemon_windows_test_fakeservice1", "daemon_windows_test_fakeservice2"},
			expectedError: "failed to open service daemon_windows_test_fakeservice1",
		},
		{
			input:         []string{existingService, "daemon_windows_test_fakeservice"},
			expectedError: "failed to open service daemon_windows_test_fakeservice",
		},
	} {
		t.Run(strings.Join(testcase.input, ";"), func(t *testing.T) {
			err := ensureServicesInstalled(testcase.input)
			if err == nil {
				t.Fatalf("expected error for input %v", testcase.input)
			}
			if !strings.Contains(err.Error(), testcase.expectedError) {
				t.Fatalf("expected error %q to contain %q", err.Error(), testcase.expectedError)
			}
		})
	}
}