chore(books): add get_book!/1

apps/app/lib/app/books.ex

@@ -14,6 +14,14 @@ defmodule App.Books do
 
   ## Database getters
 
+  @doc """
+  Gets a single book.
+
+  Raises `Ecto.NoResultsError` if the book does not exist.
+  """
+  @spec get_book!(Book.id()) :: Book.t()
+  def get_book!(id), do: Repo.get!(Book, id)
+
   @doc """
   Gets a single book if it belongs to the user.
 

apps/app/test/app/books_test.exs

@@ -13,6 +13,19 @@ defmodule App.BooksTest do
 
   ## Database getters
 
+  describe "get_book!/1" do
+    test "returns the book" do
+      %{id: id} = book_fixture()
+      assert %{id: ^id} = Books.get_book!(id)
+    end
+
+    test "raises if the book doesn't exist" do
+      assert_raise Ecto.NoResultsError, fn ->
+        Books.get_book!(0)
+      end
+    end
+  end
+
   describe "get_book_of_user/2" do
     setup :book_with_creator_context