Added more documentation. Changed monarch.get_stack()

.test/run.sh

@@ -0,0 +1,34 @@
+
+if [ $# -eq 0 ]; then
+	PLATFORM="x86_64-linux"
+else
+	PLATFORM="$1"
+fi
+
+echo "${PLATFORM}"
+
+# {"version": "1.2.89", "sha1": "5ca3dd134cc960c35ecefe12f6dc81a48f212d40"}
+SHA1=$(curl -s http://d.defold.com/stable/info.json | sed 's/.*sha1": "\(.*\)".*/\1/')
+echo "Using Defold dmengine_headless version ${SHA1}"
+
+#DMENGINE_URL="http://d.defold.com/archive/${SHA1}/engine/linux/dmengine_headless"
+DMENGINE_URL="http://d.defold.com/archive/${SHA1}/engine/${PLATFORM}/dmengine_headless"
+BOB_URL="http://d.defold.com/archive/${SHA1}/bob/bob.jar"
+
+echo "Downloading ${DMENGINE_URL}"
+curl -o dmengine_headless ${DMENGINE_URL}
+chmod +x dmengine_headless
+
+echo "Downloading ${BOB_URL}"
+curl -o bob.jar ${BOB_URL}
+
+if [ -n "${DEFOLD_AUTH}" ] && [ -n "${DEFOLD_USER}" ]; then
+	echo "Running bob.jar - resolving dependencies"
+	java -jar bob.jar --auth "${DEFOLD_AUTH}" --email "${DEFOLD_USER}" resolve
+fi
+
+echo "Running bob.jar - building"
+java -jar bob.jar --debug build
+
+echo "Starting dmengine_headless"
+./dmengine_headless

.travis.yml

@@ -0,0 +1,27 @@
+sudo: required
+
+script:
+  - sudo unlink /usr/bin/gcc && sudo ln -s /usr/bin/gcc-5 /usr/bin/gcc
+  - gcc --version
+
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - gcc-5
+    - g++-5
+
+language: java
+
+jdk:
+  - oraclejdk8
+
+#DEFOLD_AUTH=auth token
+env:
+  global:
+    - secure: "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"
+    - DEFOLD_USER=bjorn.ritzl@king.com
+
+script:
+  - "./.test/run.sh"

README.md

@@ -6,6 +6,8 @@ You can use Monarch in your own project by adding this project as a [Defold libr
 
 https://github.com/britzl/monarch/archive/master.zip
 
+Or point to the ZIP file of a [specific release](https://github.com/britzl/monarch/releases).
+
 # Usage
 Using Monarch requires that screens are created in a certain way. Once you have one or more screens created you can start navigating between the screens.
 

example/example.collection

@@ -1,4 +1,4 @@
-name: "main"
+name: "example"
 scale_along_z: 0
 embedded_instances {
   id: "menu"

game.project

@@ -1,9 +1,10 @@
 [project]
 title = Monarch
 version = 0.9
+dependencies = https://github.com/britzl/deftest/archive/1.2.1.zip
 
 [bootstrap]
-main_collection = /example/main.collectionc
+main_collection = /test/test.collectionc
 
 [input]
 game_binding = /input/game.input_bindingc

monarch/monarch.lua

@@ -43,7 +43,11 @@ local function screen_from_script()
 	end
 end
 
-local function in_stack(id)
+
+--- Check if a screen exists in the current screen stack
+-- @param id
+-- @return true of the screen is in the stack
+function M.in_stack(id)
 	for i = 1, #stack do
 		if stack[i].id == id then
 			return true
@@ -52,8 +56,33 @@ local function in_stack(id)
 	return false
 end
 
+
+--- Check if a screen is at the top of the stack
+-- (primarily used for unit tests, but could have a usecase outside tests)
+-- @param id
+-- @return true if the screen is at the top of the stack
+function M.is_top(id)
+	local top = stack[#stack]
+	return top and top.id == id or false
+end
+
+
+--- Register a new screen
+-- This is done automatically by the screen.script. It is expected that the
+-- caller of this function is a script component attached to the same game
+-- object as the proxy. This is required since monarch will acquire and
+-- release input focus of the game object where the proxy is attached.
+-- @param id Unique id of the screen
+-- @param proxy URL to the collection proxy containing the screen
+-- @param popup true the screen is a popup
+-- @param transition_url Optional URL to a script that is
+-- responsible for the screen transitions
+-- @param focus_url Optional URL to a script that is to be notified of
+-- focus lost/gained events
 function M.register(id, proxy, popup, transition_url, focus_url)
 	assert(not screens[id], ("There is already a screen registered with id %s"):format(tostring(id)))
+	assert(proxy, "You must provide a collection proxy URL")
+	local url = msg.url(proxy)
 	screens[id] = {
 		id = id,
 		proxy = proxy,
@@ -64,6 +93,9 @@ function M.register(id, proxy, popup, transition_url, focus_url)
 	}
 end
 
+--- Unregister a screen
+-- This is done automatically by the screen.script
+-- @param id Id of the screen to unregister
 function M.unregister(id)
 	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
 	screens[id] = nil
@@ -191,7 +223,7 @@ end
 -- @param id Id of the screen to show
 -- @param options Table with options when showing the screen (can be nil). Valid values:
 -- 		* clear - Set to true if the stack should be cleared down to an existing instance of the screen
--- 		* reload - Set to true if screen should be reloaded if it already exists in the stack and is loaded
+-- 		* reload - Set to true if screen should be reloaded if it already exists in the stack and is loaded.
 --				  This would be the case if doing a show() from a popup on the screen just below the popup.
 -- @param data Optional data to set on the screen. Can be retrieved by the data() function
 -- @param cb Optional callback to invoke when screen is shown
@@ -224,7 +256,7 @@ function M.show(id, options, data, cb)
 	-- to remove every screen on the stack up until and
 	-- including the screen itself
 	if options and options.clear then
-		while in_stack(id) do
+		while M.in_stack(id) do
 			table.remove(stack)
 		end
 	end
@@ -244,7 +276,7 @@ function M.back(data, cb)
 		back_out(screen, top, cb)
 		if top then
 			if data then
-				screen.data = data
+				top.data = data
 			end
 			back_in(top, screen)
 		end
@@ -274,6 +306,18 @@ function M.on_message(message_id, message, sender)
 	end
 end
 
+--- Get a list of ids for the current screen stack
+-- (primarily used for unit testing, but could have uses outside testing)
+-- @return Table with screen ids. First entry is at the bottom of the
+-- stack and the last value is at the top (and currently visible)
+function M.get_stack()
+	local s = {}
+	for k,v in pairs(stack) do
+		s[k] = v.id
+	end
+	return s
+end
+
 function M.dump_stack()
 	local s = ""
 	for i, screen in ipairs(stack) do

monarch/screen.script

@@ -1,4 +1,4 @@
-local monarch = require "monarch.monarch"
+local monarch
 
 go.property("screen_proxy", msg.url("#collectionproxy"))
 go.property("screen_id", hash(""))
@@ -8,6 +8,7 @@ go.property("focus_url", msg.url())
 
 
 function init(self)
+	monarch = require "monarch.monarch"
 	monarch.register(self.screen_id, self.screen_proxy, self.popup, self.transition_url, self.focus_url)
 end
 

test/cowait.lua

@@ -0,0 +1,48 @@
+local M = {}
+
+
+local instances = {}
+
+local function create(fn)
+	local instance = {
+		co = coroutine.running(),
+		fn = fn,
+	}
+	table.insert(instances, instance)
+	coroutine.yield(instance.co)
+end
+
+	
+
+function M.seconds(amount)
+	local time = socket.gettime() + amount
+	create(function()
+		return socket.gettime() >= time
+	end)
+end
+
+
+function M.eval(fn)
+	create(fn)
+end
+
+function M.update()
+	for k,instance in pairs(instances) do
+		if instance.fn() then
+			instances[k] = nil
+			coroutine.resume(instance.co)
+		end
+	end
+end
+
+return setmetatable(M, {
+	__call = function(self, arg1, ...)
+		if type(arg1) == "number" then
+			return M.seconds(arg1, ...)
+		elseif type(arg1) == "function" then
+			return M.eval(arg1, ...)
+		else
+			error("Unknown argument type")
+		end
+	end
+})

test/cowait.script

@@ -0,0 +1,5 @@
+local cowait = require "test.cowait"
+
+function update(self, dt)
+	cowait.update()
+end

test/data/screen1.collection

@@ -0,0 +1,37 @@
+name: "screen1"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"screen1\"\n"
+  "  component: \"/test/data/screen1.gui\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

test/data/screen1.gui

@@ -0,0 +1,131 @@
+script: "/test/data/screen1.gui_script"
+fonts {
+  name: "example"
+  font: "/assets/example.font"
+}
+background_color {
+  x: 0.0
+  y: 0.0
+  z: 0.0
+  w: 0.0
+}
+nodes {
+  position {
+    x: 320.0
+    y: 568.0
+    z: 0.0
+    w: 1.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  size {
+    x: 200.0
+    y: 100.0
+    z: 0.0
+    w: 1.0
+  }
+  color {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  type: TYPE_BOX
+  blend_mode: BLEND_MODE_ALPHA
+  texture: ""
+  id: "box"
+  xanchor: XANCHOR_NONE
+  yanchor: YANCHOR_NONE
+  pivot: PIVOT_CENTER
+  adjust_mode: ADJUST_MODE_FIT
+  layer: ""
+  inherit_alpha: true
+  slice9 {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 0.0
+  }
+  clipping_mode: CLIPPING_MODE_NONE
+  clipping_visible: true
+  clipping_inverted: false
+  alpha: 1.0
+  template_node_child: false
+  size_mode: SIZE_MODE_AUTO
+}
+nodes {
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  size {
+    x: 200.0
+    y: 100.0
+    z: 0.0
+    w: 1.0
+  }
+  color {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  type: TYPE_TEXT
+  blend_mode: BLEND_MODE_ALPHA
+  text: "1"
+  font: "example"
+  id: "text"
+  xanchor: XANCHOR_NONE
+  yanchor: YANCHOR_NONE
+  pivot: PIVOT_CENTER
+  outline {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  shadow {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  adjust_mode: ADJUST_MODE_FIT
+  line_break: false
+  parent: "box"
+  layer: ""
+  inherit_alpha: true
+  alpha: 1.0
+  outline_alpha: 1.0
+  shadow_alpha: 1.0
+  template_node_child: false
+  text_leading: 1.0
+  text_tracking: 0.0
+}
+material: "/builtins/materials/gui.material"
+adjust_reference: ADJUST_REFERENCE_PARENT
+max_nodes: 512

test/data/screen1.gui_script

@@ -0,0 +1,12 @@
+function init(self)
+	print("init - screen1")
+end
+
+function final(self)
+	print("final - screen1")
+end
+
+function on_message(self, message_id, message, sender)
+	-- Add message-handling code here
+	-- Remove this function if not needed
+end

test/data/screen2.collection

@@ -0,0 +1,37 @@
+name: "screen2"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"screen2\"\n"
+  "  component: \"/test/data/screen2.gui\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

test/data/screen2.gui

@@ -0,0 +1,131 @@
+script: "/test/data/screen2.gui_script"
+fonts {
+  name: "example"
+  font: "/assets/example.font"
+}
+background_color {
+  x: 0.0
+  y: 0.0
+  z: 0.0
+  w: 0.0
+}
+nodes {
+  position {
+    x: 320.0
+    y: 697.0
+    z: 0.0
+    w: 1.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  size {
+    x: 200.0
+    y: 100.0
+    z: 0.0
+    w: 1.0
+  }
+  color {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  type: TYPE_BOX
+  blend_mode: BLEND_MODE_ALPHA
+  texture: ""
+  id: "box"
+  xanchor: XANCHOR_NONE
+  yanchor: YANCHOR_NONE
+  pivot: PIVOT_CENTER
+  adjust_mode: ADJUST_MODE_FIT
+  layer: ""
+  inherit_alpha: true
+  slice9 {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 0.0
+  }
+  clipping_mode: CLIPPING_MODE_NONE
+  clipping_visible: true
+  clipping_inverted: false
+  alpha: 1.0
+  template_node_child: false
+  size_mode: SIZE_MODE_AUTO
+}
+nodes {
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  size {
+    x: 200.0
+    y: 100.0
+    z: 0.0
+    w: 1.0
+  }
+  color {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  type: TYPE_TEXT
+  blend_mode: BLEND_MODE_ALPHA
+  text: "2"
+  font: "example"
+  id: "text"
+  xanchor: XANCHOR_NONE
+  yanchor: YANCHOR_NONE
+  pivot: PIVOT_CENTER
+  outline {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  shadow {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+    w: 1.0
+  }
+  adjust_mode: ADJUST_MODE_FIT
+  line_break: false
+  parent: "box"
+  layer: ""
+  inherit_alpha: true
+  alpha: 1.0
+  outline_alpha: 1.0
+  shadow_alpha: 1.0
+  template_node_child: false
+  text_leading: 1.0
+  text_tracking: 0.0
+}
+material: "/builtins/materials/gui.material"
+adjust_reference: ADJUST_REFERENCE_PARENT
+max_nodes: 512

test/data/screen2.gui_script

@@ -0,0 +1,12 @@
+function init(self)
+	print("init - screen2")
+end
+
+function final(self)
+	print("final - screen2")
+end
+
+function on_message(self, message_id, message, sender)
+	-- Add message-handling code here
+	-- Remove this function if not needed
+end

test/data/screens.collection

@@ -0,0 +1,118 @@
+name: "screens"
+scale_along_z: 0
+embedded_instances {
+  id: "screen1"
+  data: "components {\n"
+  "  id: \"screen\"\n"
+  "  component: \"/monarch/screen.script\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "  properties {\n"
+  "    id: \"screen_id\"\n"
+  "    value: \"screen1\"\n"
+  "    type: PROPERTY_TYPE_HASH\n"
+  "  }\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"collectionproxy\"\n"
+  "  type: \"collectionproxy\"\n"
+  "  data: \"collection: \\\"/test/data/screen1.collection\\\"\\n"
+  "exclude: false\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}
+embedded_instances {
+  id: "screen2"
+  data: "components {\n"
+  "  id: \"screen\"\n"
+  "  component: \"/monarch/screen.script\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "  properties {\n"
+  "    id: \"screen_id\"\n"
+  "    value: \"screen2\"\n"
+  "    type: PROPERTY_TYPE_HASH\n"
+  "  }\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"collectionproxy\"\n"
+  "  type: \"collectionproxy\"\n"
+  "  data: \"collection: \\\"/test/data/screen2.collection\\\"\\n"
+  "exclude: false\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

test/test.collection

@@ -0,0 +1,70 @@
+name: "test"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"test\"\n"
+  "  component: \"/test/test.script\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  "components {\n"
+  "  id: \"cowait\"\n"
+  "  component: \"/test/cowait.script\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"screensfactory\"\n"
+  "  type: \"collectionfactory\"\n"
+  "  data: \"prototype: \\\"/test/data/screens.collection\\\"\\n"
+  "load_dynamically: false\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

test/test.script

@@ -0,0 +1,9 @@
+local deftest = require "deftest.deftest"
+
+local test_monarch = require "test.test_monarch"
+
+
+function init(self)
+	deftest.add(test_monarch)
+	deftest.run()
+end

test/test_monarch.lua

@@ -0,0 +1,135 @@
+local cowait = require "test.cowait"
+local monarch = require "monarch.monarch"
+
+local SCREEN1 = hash("screen1")
+local SCREEN2 = hash("screen2")
+local FOOBAR = hash("foobar")
+
+return function()
+
+	local screens_instances = {}
+
+	local function is_shown(screen_id)
+		return monarch.is_top(screen_id)
+	end
+
+	local function is_hidden(screen_id)
+		return not monarch.is_top(screen_id)
+	end
+
+	local function wait_timeout(fn, ...)
+		local args = { ... }
+		local time = socket.gettime()
+		cowait(function()
+			return fn(unpack(args)) or socket.gettime() > time + 5	
+		end)
+		return fn(...)
+	end
+		
+	local function wait_until_shown(screen_id)
+		return wait_timeout(is_shown, screen_id)
+	end
+	local function wait_until_hidden(screen_id)
+		return wait_timeout(is_hidden, screen_id)
+	end
+
+	local function assert_stack(expected_screens)
+		local actual_screens = monarch.get_stack()
+		if #actual_screens ~= #expected_screens then
+			error("Stack length mismatch", 2)
+		end
+		for i=1,#actual_screens do
+			if actual_screens[i] ~= expected_screens[i] then
+				error("Stack content not matching", 2)
+			end
+		end
+	end
+
+	
+	describe("monarch", function()
+		before(function()
+			monarch = require "monarch.monarch"
+			screens_instances = collectionfactory.create("#screensfactory")
+		end)
+
+		after(function()
+			package.loaded["monarch.monarch"] = nil
+			for id,instance_id in pairs(screens_instances) do
+				go.delete(instance_id)
+			end
+			cowait(0.1)
+		end)
+
+
+		it("should be able to tell if a screen exists", function()
+			assert(monarch.screen_exists(SCREEN1))
+			assert(not monarch.screen_exists(hash("foobar")))
+		end)
+
+
+		it("should be able to show screens and go back to previous screens", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+
+			monarch.show(SCREEN2)
+			assert(wait_until_hidden(SCREEN1), "Screen1 was never hidden")
+			assert(wait_until_shown(SCREEN2), "Screen2 was never shown")
+			assert_stack({ SCREEN1, SCREEN2 })
+
+			monarch.back()
+			assert(wait_until_hidden(SCREEN2), "Screen2 was never hidden")
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+
+			monarch.back()
+			assert(wait_until_hidden(SCREEN1), "Screen1 was never hidden")
+			assert_stack({ })
+		end)
+
+
+		it("should be able to pass data to a screen when showning it or going back to it", function()
+			local data1 = { foo = "bar" }
+			monarch.show(SCREEN1, nil, data1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+
+			local data2 = { boo = "car" }
+			monarch.show(SCREEN2, nil, data2)
+			assert(wait_until_shown(SCREEN2), "Screen2 was never shown")
+			
+			assert(monarch.data(SCREEN1) == data1, "Expected data on screen1 doesn't match actual data")
+			assert(monarch.data(SCREEN2) == data2, "Expected data on screen2 doesn't match actual data")
+
+			local data_back = { going = "back" }
+			monarch.back(data_back)
+			assert_stack({ SCREEN1 })
+
+			assert(monarch.data(SCREEN1) == data_back, "Expected data on screen1 doesn't match actual data")
+		end)
+
+
+		it("should be able to show the same screen twice", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1, SCREEN1 })
+		end)
+		
+
+		it("should be able to clear the stack if trying to show the same screen twice", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+			monarch.show(SCREEN2)
+			assert(wait_until_shown(SCREEN2), "Screen2 was never shown")
+			assert_stack({ SCREEN1, SCREEN2 })
+			monarch.show(SCREEN1, { clear = true })
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+		end)
+		
+						
+	end)
+end