lasseebert

    body = conn |> response(201) |> Poison.decode!

    assert body["id"] |> is_integer
    assert body["id"] > 0
    assert body["email"] == "alice@example.com"

lasseebert

defmodule MyApp.UserController do
  use MyApp.Web, :controller

  def create(conn, params) do
    {:ok, user} = MyApp.Users.Invite.call(params)

    conn
    |> resp(201, "{}")
  end
end

lasseebert

defmodule MyApp.Users.InviteTest do
  use MyApp.ModelCase

  alias MyApp.Users.Invite
  alias MyApp.User

  test "it creates a user" do
    {:ok, user} = Invite.call(%{email: "alice@example.com"})

    assert user.id > 0

lasseebert

$ mix test test/contexts


  1) test it creates a user (MyApp.Users.InviteTest)
     test/contexts/users/invite_test.exs:6
     ** (UndefinedFunctionError) function MyApp.Users.Invite.call/1 is undefined (module MyApp.Users.Invite is not available)
     stacktrace:
       MyApp.Users.Invite.call(%{email: "alice@example.com"})
       test/contexts/users/invite_test.exs:7: (test)

lasseebert

defmodule MyApp.Users.Invite do

  alias MyApp.User
  alias MyApp.Repo

  @create_params [:email]

  def call(%{email: email}) do
    email
    |> build_changeset

lasseebert

$ mix test test/contexts
Compiling 1 file (.ex)

== Compilation error on file lib/my_app/contexts/users/invite.ex ==
** (CompileError) lib/my_app/contexts/users/invite.ex:17: MyApp.User.__struct__/1 is undefined, cannot expand struct MyApp.User
    (stdlib) lists.erl:1354: :lists.mapfoldl/3
    (stdlib) lists.erl:1354: :lists.mapfoldl/3

lasseebert

defmodule MyApp.User do
  use MyApp.Web, :model

  schema "users" do
    field :email, :string

    timestamps
  end
end

lasseebert

$ mix test test/contexts     


  1) test it creates a user (MyApp.Users.InviteTest)
     test/contexts/users/invite_test.exs:7
     ** (Postgrex.Error) ERROR (undefined_table): relation "users" does not exist
     stacktrace:
       (ecto) lib/ecto/adapters/sql.ex:463: Ecto.Adapters.SQL.struct/6
       (ecto) lib/ecto/repo/schema.ex:397: Ecto.Repo.Schema.apply/4
       (ecto) lib/ecto/repo/schema.ex:193: anonymous fn/11 in Ecto.Repo.Schema.do_insert/4

lasseebert

$ mix test test/contexts     


  1) test it creates a user (MyApp.Users.InviteTest)
     test/contexts/users/invite_test.exs:7
     ** (Postgrex.Error) ERROR (undefined_table): relation "users" does not exist
     stacktrace:
       (ecto) lib/ecto/adapters/sql.ex:463: Ecto.Adapters.SQL.struct/6
       (ecto) lib/ecto/repo/schema.ex:397: Ecto.Repo.Schema.apply/4
       (ecto) lib/ecto/repo/schema.ex:193: anonymous fn/11 in Ecto.Repo.Schema.do_insert/4

lasseebert

defmodule MyApp.Repo.Migrations.AddUsersTable do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string

      timestamps
    end