beholder.lua/spec/acceptance.lua

local beholder = require 'beholder'


describe("Acceptance", function()

  before(function()
    beholder.reset()
  end)

  test("Basic behavior", function()

    local counter = 0

    local id = beholder.observe("EVENT", function() counter = counter + 1 end)

    beholder.trigger("EVENT")
    beholder.trigger("EVENT")

    assert_equal(counter, 2)

    beholder.stopObserving(id)

    beholder.trigger("EVENT")

    assert_equal(counter, 2)

  end)

  test("Observing subjects", function()
    local counter = 0
    local button = {}

    beholder.observeSubject(button, "EVENT", function() counter = counter + 1 end)

    beholder.trigger("EVENT")
    beholder.trigger("EVENT")

    assert_equal(2, counter)

    button = nil
    collectgarbage("collect")

    beholder.trigger("EVENT")

    assert_equal(2, counter)

  end)

  test("several actions on the same event", function()

    local counter1, counter2 = 0,0

    local id1 = beholder.observe("EVENT", function() counter1 = counter1 + 1 end)
    local id2 = beholder.observe("EVENT", function() counter2 = counter2 + 1 end)

    beholder.trigger("EVENT")
    beholder.trigger("EVENT")

    assert_equal(counter1, 2)
    assert_equal(counter2, 2)

    beholder.stopObserving(id1)

    beholder.trigger("EVENT")
    assert_equal(counter1, 2)
    assert_equal(counter2, 3)

    beholder.stopObserving(id2)

    beholder.trigger("EVENT")
    assert_equal(counter1, 2)
    assert_equal(counter2, 3)

  end)

  test("composed events", function()
    local counter = 0
    local lastKey = ""
    local enterPressed = false
    local escapePressed = false

    beholder.observe("KEYPRESS", function() counter = counter + 1 end)
    beholder.observe("KEYPRESS", function(key) lastKey = key end)
    beholder.observe("KEYPRESS", "enter", function() enterPressed = true end)

    beholder.trigger("KEYPRESS", "space")
    assert_equal(counter, 1)
    assert_equal(lastKey, "space")
    assert_false(enterPressed)
    assert_false(escapePressed)

    beholder.trigger("KEYPRESS", "enter")
    assert_equal(counter, 2)
    assert_equal(lastKey, "enter")
    assert_true(enterPressed)
    assert_false(escapePressed)
  end)

  test("nil events", function()
    local counter = 0

    local id = beholder.observe(function(_, x) counter = counter + x end)

    beholder.trigger("FOO", 1)
    beholder.trigger("BAR", 2)

    assert_equal(3, counter)

    beholder.stopObserving(id)

    beholder.observe(function() counter = 10 end)

    beholder.trigger()

    assert_equal(10, counter)
  end)

  test("triggering all events", function()
    local even = 0
    local uneven = 1

    beholder.observe("EVEN", function(x) even = even + 2*x end)
    beholder.observe("UNEVEN", function(x) uneven = uneven + 2*x end)

    beholder.triggerAll(1)

    assert_equal(even, 2)
    assert_equal(uneven, 3)

    beholder.triggerAll(2)

    assert_equal(even, 6)
    assert_equal(uneven, 7)

  end)


end)