From https://once.com/writebook

test/controllers/books/publications_controller_test.rb

@@ -0,0 +1,32 @@
+require "test_helper"
+
+class Books::PublicationsTest < ActionDispatch::IntegrationTest
+  setup do
+    @book = books(:manual)
+
+    sign_in :david
+  end
+
+  test "publish a book" do
+    assert_changes -> { @book.reload.published? }, from: false, to: true do
+      patch book_publication_url(@book), params: { book: { published: "1" } }
+    end
+
+    @book.reload
+    assert_redirected_to book_slug_url(@book)
+    assert_equal "manual", @book.slug
+  end
+
+  test "edit book slug" do
+    @book.update! published: true
+
+    get edit_book_publication_url(@book)
+    assert_response :success
+
+    patch book_publication_url(@book), params: { book: { slug: "new-slug" } }
+
+    @book.reload
+    assert_redirected_to book_slug_url(@book)
+    assert_equal "new-slug", @book.slug
+  end
+end