diff --git a/scripts/app_preferences.lua b/scripts/app_preferences.lua
new file mode 100644
index 000000000..24df608ca
--- /dev/null
+++ b/scripts/app_preferences.lua
@@ -0,0 +1,38 @@
+-- Copyright (C) 2019  Igara Studio S.A.
+--
+-- This file is released under the terms of the MIT license.
+-- Read LICENSE.txt for more information.
+
+-- Global preferences
+do
+  assert(app.preferences.general.language == "en")
+  assert(app.preferences.general.screen_scale == 2)
+  assert(app.preferences.general.ui_scale == 1)
+end
+
+-- Preferences for tools
+do
+  local t = app.preferences.tool('pencil')
+  assert(t.opacity == 255)
+  assert(t.tolerance == 0)
+  assert(t.contiguous == true)
+  assert(t.brush.type == BrushType.CIRCLE)
+  assert(t.brush.size == 1)
+  t.brush.size = 2
+  assert(t.brush.size == 2)
+
+  -- Getting the tool again will give us the default configuration
+  -- again in batch mode
+  t = app.preferences.tool('pencil')
+  assert(t.brush.size == 1)
+end
+
+-- Preferences for documents
+do
+  local s = Sprite(32, 32)
+  local p = app.preferences.document(s)
+  assert(p.grid.bounds == Rectangle(0, 0, 16, 16))
+  assert(p.grid.color == Color(0, 0, 255))
+  p.grid.color = Color(255, 0, 0)
+  assert(p.grid.color == Color(255, 0, 0))
+end