Resolve "FR-03: User Logout"

Closes #13 (closed)

features/contexts/user_logout_context.exs

+defmodule UserLogoutContext do
+  use WhiteBread.Context
+  use Hound.Helpers
+  alias PropTrackr.Accounts
+  alias PropTrackr.Repo
+  alias PropTrackr.Accounts.User
+
+  scenario_starting_state fn _state ->
+    Ecto.Adapters.SQL.Sandbox.checkout(PropTrackr.Repo)
+    Ecto.Adapters.SQL.Sandbox.mode(PropTrackr.Repo, {:shared, self()})
+    Hound.start_session()
+    %{}
+  end
+
+  scenario_finalize fn _status, _state ->
+    Ecto.Adapters.SQL.Sandbox.checkin(PropTrackr.Repo)
+    Hound.end_session()
+  end
+
+  given_ ~r/^there exists following accounts$/, fn state, %{table_data: table} ->
+    table
+    |> Enum.map(fn user_details -> User.changeset(%User{}, user_details) end)
+    |> Enum.each(fn changeset -> Repo.insert!(changeset) end)
+
+    existing_user = List.first(table)
+    {
+      :ok,
+      state
+      |> Map.put(:email, existing_user[:email])
+      |> Map.put(:password, existing_user[:password])
+    }
+  end
+
+  given_ ~r/^I am logged in$/, fn state ->
+    navigate_to("/login")
+
+    fill_field({:id, "email"}, state[:email])
+    fill_field({:id, "password"}, state[:password])
+
+    click({:id, "login_button"})
+
+    assert visible_in_page? ~r"Successfully logged in!"
+    assert current_path() == "/"
+
+    navigate_to("/users")
+
+    {:ok, state}
+  end
+
+  when_ ~r/^I click the logout button$/, fn state ->
+    click({:id, "logout_button"})
+    {:ok, state}
+  end
+
+  then_ ~r/^I should be logged out$/, fn state ->
+    assert visible_in_page? ~r"You are successfully logged out"
+    {:ok, state}
+  end
+
+  and_ ~r/^I should be redirected to the home page$/, fn state ->
+    assert current_path() == "/"
+    {:ok, state}
+  end
+
+  given_ ~r/^I am not logged in$/, fn state ->
+    navigate_to("/")
+    {:ok, state}
+  end
+
+  when_ ~r/^I try to access the logout functionality$/, fn state ->
+    navigate_to("/logout")
+    {:ok, state}
+  end
+
+  then_ ~r/^I should see an error message$/, fn state ->
+    assert visible_in_page? ~r"You are not logged in"
+    {:ok, state}
+  end
+end