From https://once.com/writebook

test/controllers/books_controller_test.rb

@@ -0,0 +1,89 @@
+require "test_helper"
+
+class BooksControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in :kevin
+  end
+
+  test "index lists the current user's books" do
+    get root_url
+
+    assert_response :success
+    assert_select "h2", text: "Handbook"
+    assert_select "h2", text: "Manual", count: 0
+  end
+
+  test "index includes published books, even when the user does not have access" do
+    books(:manual).update!(published: true)
+
+    get root_url
+
+    assert_response :success
+    assert_select "h2", text: "Handbook"
+    assert_select "h2", text: "Manual"
+  end
+
+  test "index shows published books when not logged in" do
+    books(:manual).update!(published: true)
+
+    sign_out
+    get root_url
+
+    assert_response :success
+    assert_select "h2", text: "Handbook", count: 0
+    assert_select "h2", text: "Manual"
+  end
+
+  test "index redirects to login if not signed in and no published books exist" do
+    sign_out
+    get root_url
+
+    assert_redirected_to new_session_url
+  end
+
+  test "create makes the current user an editor" do
+    assert_difference -> { Book.count }, +1 do
+      post books_url, params: { book: { title: "New Book", everyone_access: false } }
+    end
+
+    assert_redirected_to book_slug_url(Book.last)
+
+    book = Book.last
+    assert_equal "New Book", book.title
+    assert_equal 1, Book.last.accesses.count
+
+    assert book.editable?(user: users(:kevin))
+  end
+
+  test "create sets additional accesses" do
+    sign_in :jason
+    assert_difference -> { Book.count }, +1 do
+      post books_url, params: { book: { title: "New Book", everyone_access: false }, "editor_ids[]": users(:jz).id, "reader_ids[]": users(:kevin).id }
+    end
+
+    book = Book.last
+    assert_equal "New Book", book.title
+    assert_equal 3, Book.last.accesses.count
+
+    assert book.editable?(user: users(:jz))
+
+    assert book.accessable?(user: users(:kevin))
+    assert_not book.editable?(user: users(:kevin))
+  end
+
+  test "show only shows books the current user can access" do
+    get book_slug_url(books(:manual))
+    assert_response :not_found
+
+    get book_slug_url(books(:handbook))
+    assert_response :success
+  end
+
+  test "show includes OG metadata for public access" do
+    get book_slug_url(books(:handbook))
+    assert_response :success
+
+    assert_select "meta[property='og:title'][content='Handbook']"
+    assert_select "meta[property='og:url'][content='#{book_slug_url(books(:handbook))}']"
+  end
+end