Gorm Expect

A Go database testing library for use with gorm that doesn't involve a lot of pain.

Why

Testing gorm-based DALs is terrible. Most of the time, you have to use db.Debug() to print the SQL generated by gorm, escape it, generate mock sql.Rows, etc., and hope for the best. gormexpect wraps and mirrors (most of) the gorm API for superior DX.

Installation

go get -u github.com/iantanwx/gorm-expect

Usage

type User struct {
	Id           int64
	Age          int64
	Name         string `sql:"size:255"`
	Email        string
	Birthday     *time.Time // Time
	CreatedAt    time.Time  // CreatedAt: Time of record is created, will be insert automatically
	UpdatedAt    time.Time  // UpdatedAt: Time of record is updated, will be updated automatically
	Emails       []Email    // Embedded structs
	CreditCard   CreditCard
	Languages    []Language `gorm:"many2many:user_languages;"`
	PasswordHash []byte
}

type UserRepository struct {
  db *gorm.DB
}

func (r *UserRepository) FindByID(id int64) (User, error) {
	user := User{Id: id}
	err := r.db.Preload("Emails").Preload("CreditCard").Preload("Languages").Find(&user).Error
	return user, err
}

func TestUserRepoPreload1(t *testing.T) {
	db, expect, err := expecter.NewDefaultExpecter()
	defer db.Close()

	if err != nil {
		t.Fatal(err)
	}

	repo := &UserRepository{db}

	// has one
	creditCard := CreditCard{Number: "12345678"}
	// has many
	email := []Email{
		Email{Email: "fake_user@live.com"},
		Email{Email: "fake_user@gmail.com"},
	}
	// many to many
	languages := []Language{
		Language{Name: "EN"},
		Language{Name: "ZH"},
	}

	expected := User{
		Id:         1,
		Name:       "my_name",
		CreditCard: creditCard,
		Emails:     email,
		Languages:  languages,
	}

	expect.Preload("Emails").Preload("CreditCard").Preload("Languages").Find(&User{Id: 1}).Returns(expected)
	actual, err := repo.FindByID(1)

	assert.Nil(t, expect.AssertExpectations())
	assert.Nil(t, err)
	assert.Equal(t, expected, actual)
}