cron.lua/spec/cron_spec.lua

local cron = require 'cron' 

context( 'cron', function()

  local counter = 0
  local function count(amount)
    amount = amount or 1
    counter = counter + amount
  end
  local countable = setmetatable({}, {__call = count})

  before(function()
    counter = 0
    cron.reset()
  end)

  context('update', function()
    test( 'Should throw an error if dt is a negative number', function()
      assert_error(function() cron.update() end)
      assert_error(function() cron.update(-1) end)
      assert_not_error(function() cron.update(1) end)
    end)
  end)

  context('reset', function()
    test('Should cancel all timed actions', function()
      cron.after(1, count)
      cron.after(2, count)
      cron.update(1)
      assert_equal(counter, 1)
      cron.reset()
      cron.update(1)
      assert_equal(counter, 1)
    end)

    test('Should cancel all periodical actions', function()
      cron.every(1, count)
      cron.update(1)
      assert_equal(counter, 1)
      cron.reset()
      cron.update(1)
      assert_equal(counter, 1)
    end)

  end)

  context( 'after', function()
    test( 'Should throw error if time is not a positive number, or callback is not callable', function()
      assert_error(function() cron.after('error', count) end)
      assert_error(function() cron.after(2, 'error') end)
      assert_error(function() cron.after(-2, count) end)
      assert_error(function() cron.after(2, {}) end)
      assert_not_error(function() cron.after(2, count) end)
      assert_not_error(function() cron.after(2, countable) end)
    end)
    
    test( 'Should execute timed actions are executed only once, at the right time', function()
      cron.after(2, count)
      cron.after(4, count)
      cron.update(1)
      assert_equal(counter, 0)
      cron.update(1)
      assert_equal(counter, 1)
      cron.update(1)
      assert_equal(counter, 1)
      cron.update(1)
      assert_equal(counter, 2)
    end)

    test( 'Should pass on parameters to the function, if specified', function()
      cron.after(1, count, 2)
      cron.update(1)
      assert_equal(counter, 2)
    end)
  end)

  context( 'every', function()
    test( 'Should throw error if time is not a positive number, or callback is not function', function()
      assert_error(function() cron.every('error', count) end)
      assert_error(function() cron.every(2, 'error') end)
      assert_error(function() cron.every(-2, count) end)
      assert_error(function() cron.every(-2, {}) end)
      assert_not_error(function() cron.every(2, count) end)
      assert_not_error(function() cron.every(2, countable) end)
    end)

    test( 'Should execute periodical actions periodically', function()
      cron.every(3, count)
      cron.update(1)
      assert_equal(counter, 0)
      cron.update(2)
      assert_equal(counter, 1)
      cron.update(2)
      assert_equal(counter, 1)
      cron.update(1)
      assert_equal(counter, 2)
    end)

    test( 'Should execute the same action multiple times on a single update if appropiate', function()
      cron.every(1, count)
      cron.update(2)
      assert_equal(counter, 2)
    end)

    test( 'Should respect parameters', function()
      cron.every(1, count, 2)
      cron.update(2)
      assert_equal(counter, 4)
    end)
  end)

  context( 'cancel', function()
    test( 'Should allow the cancelation of timed actions', function()
      local id = cron.after(1, count)
      cron.update(1)
      assert_equal(counter, 1)
      cron.cancel(id)
      cron.update(1)
      assert_equal(counter, 1)
    end)

    test( 'Should allow the cancelation of periodical actions', function()
      local id = cron.every(1, count)
      cron.update(1)
      assert_equal(counter, 1)
      cron.cancel(id)
      cron.update(1)
      assert_equal(counter, 1)
    end)
  end)



end)