From https://once.com/writebook

test/controllers/pages_controller_test.rb

@@ -0,0 +1,86 @@
+require "test_helper"
+
+class PagesControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in :kevin
+  end
+
+  test "show" do
+    get leafable_path(sample_page_leaf("## Hello"))
+
+    assert_response :ok
+    assert_select "h2", text: /Hello/
+  end
+
+  test "show sanitizes dangerous content" do
+    get leafable_path(sample_page_leaf(%(<div id="test"><script>alert("ouch")</script></div>)))
+
+    assert_select "#test", html: %(alert("ouch"))
+  end
+
+  test "show with HTML content in the markdown" do
+    get leafable_path(sample_page_leaf(%(<div id="test"><div style="text-align:center;">Hello</div></div>)))
+
+    assert_select "#test", html: %(<div style="text-align:center;">Hello</div>)
+  end
+
+  test "show with iframes" do
+    get leafable_path(sample_page_leaf(%(<div id="test"><iframe src="http://example.com"></iframe></div>)))
+
+    assert_select "#test", html: %(<iframe src="http://example.com"></iframe>)
+  end
+
+  test "show with tables in the markdown" do
+    get leafable_path(sample_page_leaf(%(| name | food |\n| ---- | ---- |\n| Kevin | Pizza |)))
+
+    assert_select "table th", text: "name"
+    assert_select "table th", text: "food"
+    assert_select "table td", text: "Kevin"
+    assert_select "table td", text: "Pizza"
+  end
+
+  test "create" do
+    post book_pages_path(books(:handbook), format: :turbo_stream), params: { leaf: { title: "Another page" }, page: { body: "With interesting words." } }
+    assert_response :success
+
+    new_page = Page.last
+    assert_equal "Another page", new_page.title
+    assert_equal "With interesting words.", new_page.body.content
+    assert_equal books(:handbook), new_page.leaf.book
+  end
+
+  test "create with default params" do
+    assert_changes -> { Page.count }, +1 do
+      post book_pages_path(books(:handbook), format: :turbo_stream)
+    end
+    assert_response :success
+
+    assert_equal "Untitled", Page.last.title
+  end
+
+  test "create at a specific position" do
+    assert_changes -> { Page.count }, +1 do
+      post book_pages_path(books(:handbook), format: :turbo_stream), params: { position: 2 }
+    end
+    assert_response :success
+
+    assert_equal 2, books(:handbook).leaves.before(Page.last.leaf).count
+  end
+
+  test "update" do
+    get edit_leafable_path(leaves(:welcome_page))
+    assert_response :ok
+
+    put leafable_path(leaves(:welcome_page)), params: { leaf: { title: "Better welcome" }, page: { body: "With even more interesting words." } }
+    assert_response :no_content
+
+    updated_page = Page.last
+    assert_equal "Better welcome", updated_page.title
+    assert_equal "With even more interesting words.", updated_page.body.content
+  end
+
+  private
+    def sample_page_leaf(markdown)
+      books(:handbook).press Page.new(body: markdown), title: "Sample"
+    end
+end