Monarch-Extension/test/test_monarch.lua

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