t.Errorf("no error should happened when deleting team, but got %v", err)
	}

	AssertAssociationCount(t, users, "Team", 2, "after delete")

	// Clear
	DB.Model(&users).Association("Team").Clear()
	AssertAssociationCount(t, users, "Team", 0, "After Clear")
}

func TestDuplicateMany2ManyAssociation(t *testing.T) {

	user := *GetUser("user_without_associations", Config{})
	DB.Create(&user)

	DB.Preload("Team").Preload("Languages").Preload("Friends").First(&user, "name = ?", user.Name)

	if r, err := json.Marshal(&user); err != nil {
		t.Errorf("failed to marshal users, got error %v", err)
	} else if !regexp.MustCompile(`"Team":\[\],"Languages":\[\],"Friends":\[\]`).MatchString(string(r)) {

	result.Team = append(user.Team, result.Team...)
	result.Friends = append(user.Friends, result.Friends...)

	sort.Slice(result.Pets, func(i, j int) bool {
		return result.Pets[i].ID < result.Pets[j].ID
	})
	sort.Slice(result.Team, func(i, j int) bool {
		return result.Team[i].ID < result.Team[j].ID
	})
	sort.Slice(result.Friends, func(i, j int) bool {

	// https://developer.apple.com/membercenter/index.action#accountSummary as Team ID.
	appID = getenv("GOIOS_APP_ID")

	// e.g. Z8B3JBXXXX, available at
	// https://developer.apple.com/membercenter/index.action#accountSummary as Team ID.
	teamID = getenv("GOIOS_TEAM_ID")

	// Device IDs as listed with ios-deploy -c.
	deviceID = os.Getenv("GOIOS_DEVICE_ID")

	if err := DB.Model(&user2).Association("Team").Append(&teams); err != nil {
		t.Fatalf("Error happened when append team, got %v", err)
	}

	for _, team := range teams {
		team := team
		if team.ID == 0 {
			t.Fatalf("Team's ID should be created")
		}

		user.Team = append(user.Team, team)
	}

	CheckUser(t, user2, user)

		*GetUser("bulk_5", Config{Account: false, Pets: 0, Toys: 3, Company: true, Manager: false, Team: 1, Languages: 3, Friends: 1}),
		*GetUser("bulk_6", Config{Account: true, Pets: 4, Toys: 3, Company: false, Manager: true, Team: 1, Languages: 3, Friends: 0}),
		*GetUser("bulk_7", Config{Account: true, Pets: 1, Toys: 3, Company: true, Manager: true, Team: 4, Languages: 3, Friends: 1}),

		},
		{
			Name: "Manager", Type: schema.BelongsTo, Schema: "User", FieldSchema: "User",
			References: []Reference{{"ID", "User", "ManagerID", "User", "", false}},
		},
		{
			Name: "Team", Type: schema.HasMany, Schema: "User", FieldSchema: "User",
			References: []Reference{{"ID", "User", "ManagerID", "User", "", true}},
		},
		{