awesome/tests/test-screen-changes.lua

-- Tests for screen additions & removals

local runner = require("_runner")
local test_client = require("_client")
local naughty = require("naughty")

local real_screen = screen[1]
local fake_screen = screen.fake_add(50, 50, 500, 500)
local test_client1, test_client2

local steps = {
    -- Step 1: Set up some clients to experiment with and assign them as needed
    function(count)
        if count == 1 then  -- Setup.
            test_client()
            test_client()
        end
        local cls = client.get()
        if #cls == 2 then
            test_client1, test_client2 = cls[1], cls[2]
            test_client1.screen = real_screen
            test_client2.screen = fake_screen

            -- Display a notification on the screen-to-be-removed
            naughty.notify{ text = "test", screen = fake_screen }

            return true
        end
    end,

    -- Step 2: Say goodbye to the screen
    function()
        fake_screen:fake_remove()

        -- TODO: This is a hack to make the test work, how to do this so that it
        -- also works "in the wild"?
        mypromptbox[fake_screen] = nil
        mylayoutbox[fake_screen] = nil
        mytaglist[fake_screen] = nil
        mytasklist[fake_screen] = nil
        mywibox[fake_screen] = nil

        -- Wrap in a weak table to allow garbage collection
        fake_screen = setmetatable({ fake_screen }, { __mode = "v" })

        return true
    end,

    -- Step 3: Everything should now be on the main screen, the old screen
    -- should be garbage collectable
    function()
        assert(test_client1.screen == real_screen, test_client1.screen)
        assert(test_client2.screen == real_screen, test_client2.screen)

        collectgarbage("collect")
        if #fake_screen == 0 then
            return true
        end
    end,
}

runner.run_steps(steps)

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