Factori

Test data without boilerplate. Always in-sync with your database schema.

defmodule MyAppTest.Factory do
  use Factori, repo: MyApp.Repo, mappings: [Factori.Mapping.Faker, Factori.Mapping.Enum]
end

user = MyAppTest.Factory.insert("users")
user.first_name # => "Lorem"
user.last_name # => "Ipsum"

Installation

In mix.exs, add the factori dependency:

def deps do
  [
    {:factori, "~> 0.0.2"},
  ]
end

Overview

Define your Factory module with the repo (typically in test/support).

defmodule MyAppTest.Factory do
  use Factori, repo: MyApp.Repo, mappings: [Factori.Mapping.Faker]
end

Initialize the module by checking out the Repo and boostraping the Factory.

This is typically done in data_case.ex.

setup_all do
  :ok = Ecto.Adapters.SQL.Sandbox.checkout(Repo)
  Ecto.Adapters.SQL.Sandbox.mode(Repo, {:shared, self()})

  MyApp.Factory.bootstrap()
  :ok
end

Usage

In a test case, just use your Factory module by referencing the table name

test "insert user" do
  user = Factory.insert("users")
  assert user.id
end

Overrides

test "insert user with overrides" do
  user = Factory.insert("users", name: "Test")
  assert user.name === "Test"
end

Mappings

Mappings are modules or functions used to map data to columns. factori ships with a Faker integration that insert valid data from the type of the column. You can add your own mapper before Faker to override the data mapping:

defmodule MyAppTest.MappingCustom do
  @behaviour Factori.Mapping
  def match(%{name: :name}), do: "bar"
end

defmodule MyAppTest.Factory do
  use Factori,
    repo: MyApp.Repo,
    mappings: [fn %{name: :name} -> "foo" end, MappingCustom, Factori.Mapping.Faker]
end

test "mappings" do
  user = Factory.insert("users")
  assert user.name === "foo"
end

Mappings also supports transforming data. This can be useful when we want random data but with a bit more control before inserting into the database: In the example, the custom module does not implement the mapping, so the Faker one is taken. Then, the transform/2 is called to alter the data.

defmodule MyAppTest.Transform do
  @behaviour Factori.Mapping
  def transform(%{name: :password}, value), do: Bcrypt.hash_pwd_salt(value)
end

defmodule MyAppTest.Factory do
  use Factori,
    repo: MyApp.Repo,
    mappings: [Transform, Factori.Mapping.Faker]
end

test "transforms" do
  user = Factory.insert("users", password: "test123")
  assert user.password === "$2b$12$3.EX0EHSwjNewmD18Ir5A.brKyJh3.DCKzLjX96wCwovzie2I1wcW"
end

The first module to implement a matching match function will be taken, but the transform is called on every items in mappings options.

Variants

Instead of using string to reference the "raw" table names, you can use named variants:

defmodule MyAppTest.Factory do
  use Factori,
    repo: MyApp.Repo,
    mappings: [Factori.Mapping.Faker],
    variants: [{:user, "users"}]
end

MyAppTest.Factory.insert(:user)
MyAppTest.Factory.insert(:user, name: "Test")

Variants can also include overrides:

defmodule MyAppTest.Factory do
  use Factori,
    repo: MyApp.Repo,
    mappings: [Factori.Mapping.Faker],
    variants: [{:user, "users", name: "Test"}]
end

test "insert user with overrides" do
  user = Factory.insert(:user)
  assert user.name === "Test"

  user = Factory.insert(:user, name: "123")
  assert user.name === "123"
end

Ecto and structs

defmodule MyApp.User do
  use Ecto.Schema

  schema "users" do
    field(:name, :string)
    field(:admin, :boolean)
  end
end

defmodule MyAppTest.Factory do
  use Factori,
    repo: MyApp.Repo,
    mappings: [Factori.Mapping.Faker],
    variants: [{:user, MyApp.User}, {:admin, MyApp.User, admin: true}]
end

test "insert ecto schema" do
  user = Factory.insert(:user)
  assert user.name

  admin = Factory.insert(:admin)
  assert admin.admin
end

gerbal/factori