user repo test

test/models/user_repo_test.ex

defmodule Storybook.UserRepoTest do
  use Storybook.ModelCase
  import Storybook.Factory
  alias Storybook.User

  @valid_attrs %{email: "[email protected]", username: "user", password: "password"}
  @test_attrs %{email: "[email protected]", username: "different_user", password: "different_password"}

  setup do
    insert(:user, @valid_attrs)
  end

  test "converts unique_constraint on username to error" do
    attrs = Map.put(@test_attrs, :username, "user")
    changeset = User.registration_changeset(%User{}, attrs)

    assert {:error, changeset} = Repo.insert(changeset)
    assert {:username, {"has already been taken", []}} in changeset.errors
  end

  test "converts unique_constraint on email to error" do
    attrs = Map.put(@test_attrs, :email, "[email protected]")
    changeset = User.registration_changeset(%User{}, attrs)

    assert {:error, changeset} = Repo.insert(changeset)
    assert {:email, {"has already been taken", []}} in changeset.errors
  end
end
========================================================================================================================

test result

2) test converts unique_constraint on username to error (Storybook.UserRepoTest)
test/models/user_repo_test.exs:9
match (=) failed
code: {:error, changeset} = Repo.insert(changeset)
rhs:  {:ok,
       %Storybook.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">,
        email: "[email protected]", id: 96,
        inserted_at: #Ecto.DateTime<2016-10-17 07:49:42>, name: nil,
        password: "different_password",
        password_hash: "$2b$12$Hnj8diCdDn9Elj0l9.uOQuAnVtpFDkrThfzsyJswMCjU2ZraYXJdW",
        updated_at: #Ecto.DateTime<2016-10-17 07:49:42>, username: "user"}}
stacktrace:
   test/models/user_repo_test.exs:16: (test)
                                                                                                                                                                                    
                                                                                                                                                                                    
========================================================================================================================
models/user.ex

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

  schema "users" do
    field :email, :string
    field :name, :string
    field :username, :string
    field :password, :string, virtual: true
    field :password_hash, :string

    timestamps()
  end

  @doc """
  Builds a changeset based on the `struct` and `params`.
  """
  def changeset(struct, params \\ %{}) do
    struct
    |> cast(params, [:email, :username])
    |> validate_required([:email, :username])
    |> validate_length(:username, max: 40)
    |> unique_constraint(:username)
    |> unique_constraint(:email)
  end

  def registration_changeset(struct, params \\ %{}) do
    struct
    |> changeset(params)
    |> cast(params, [:password])
    |> validate_required([:password])
    |> validate_length(:password, min: 6)
    |> put_password_hash()
  end

  defp put_password_hash(changeset) do
    case changeset do
      %Ecto.Changeset{valid?: true, changes: %{password: password}} ->
        put_change(changeset, :password_hash, Comeonin.Bcrypt.hashpwsalt(password))
      _ ->
        changeset
    end
  end
end

================================================================================================
defmodule Storybook.Factory do
  use ExMachina.Ecto, repo: Storybook.Repo

  def user_factory do
    %Storybook.User{
      username: "Json Mraz",
      email: sequence(:email, &"email-#{&1}@example.com")
    }
  end
end