From https://once.com/writebook

test/models/leaf/editable_test.rb

@@ -0,0 +1,66 @@
+require "test_helper"
+
+class Leaf::EditableTest < ActiveSupport::TestCase
+  test "editing a leafable records the edit" do
+    leaves(:welcome_page).edit leafable_params: { body: "New body" }
+
+    assert_equal "New body", leaves(:welcome_page).page.body.content
+
+    assert leaves(:welcome_page).edits.last.revision?
+    assert_equal "This is _such_ a great handbook.", leaves(:welcome_page).edits.last.page.body.content
+  end
+
+  test "edits that are close together don't create new revisions" do
+    assert_difference -> { leaves(:welcome_page).edits.count }, +1 do
+      leaves(:welcome_page).edit leafable_params: { body: "First change" }
+    end
+
+    freeze_time
+    travel 1.minute
+
+    assert_no_difference -> { leaves(:welcome_page).edits.count } do
+      leaves(:welcome_page).edit leafable_params: { body: "Second change" }
+    end
+
+    assert_equal "Second change", leaves(:welcome_page).page.body.content
+    assert_equal Time.now, leaves(:welcome_page).edits.last.updated_at
+
+    travel 1.hour
+
+    assert_difference -> { leaves(:welcome_page).edits.count }, +1 do
+      leaves(:welcome_page).edit leafable_params: { body: "Third change" }
+    end
+  end
+
+  test "changing a leaf title doesn't create a revision" do
+    assert_no_difference -> { Edit.count } do
+      leaves(:welcome_page).edit leaf_params: { title: "New title" }
+    end
+
+    assert_equal "New title", leaves(:welcome_page).title
+  end
+
+  test "changes that don't affect the leafable don't create a revision" do
+    assert_no_difference -> { Edit.count } do
+      leaves(:welcome_page).edit leafable_params: {}
+    end
+  end
+
+  test "editing a leafable with an attachment includes the attachments in the new version" do
+    assert leaves(:reading_picture).picture.image.attached?
+
+    leaves(:reading_picture).edit leaf_params: { title: "New title" }
+
+    assert_equal "New title", leaves(:reading_picture).title
+    assert leaves(:reading_picture).picture.image.attached?
+  end
+
+  test "trashing a leaf records the edit" do
+    leaves(:welcome_page).trashed!
+
+    assert leaves(:welcome_page).trashed?
+
+    assert leaves(:welcome_page).edits.last.trash?
+    assert_equal "This is _such_ a great handbook.", leaves(:welcome_page).edits.last.page.body.content
+  end
+end