test.lua

local test = require 'simple_test'
local array = require 'array'

test('meta infos', function(a)
  a.equal(array.__VERSION, '1.3.6')
  a.equal(array.__DESCRIPTION,
  "A small library with useful methods to handle Lua's table when it's working like an Array")
end)

test('is_array', function(a)
  a.not_ok(array.is_array('lua'))
  a.not_ok(array.is_array({ language='lua' }))
  a.ok(array.is_array({}))
  a.ok(array.is_array({ 'a', 'b', 'c', 'd' }))
end)

test('is_empty', function(a)
  a.not_ok(array.is_empty({ 'a' }))
  a.ok(array.is_empty({}))
end)

test('first', function(a)
  a.equal(array.first({ 'a', 'b', 'c', 'd' }), 'a')
end)

test('last', function(a)
  a.equal(array.last({ 'a', 'b', 'c', 'd' }), 'd')
end)

test('slice', function(a)
  a.equal(#array.slice({}, 1, 2), 0)

  a.deep_equal(
    array.slice({ 'lua', 'javascript', 'python', 'ruby', 'c' }, 2, 5),
    { 'javascript', 'python', 'ruby' }
  )

  a.deep_equal(
    array.slice({ 'lua', 'javascript', 'python', 'ruby', 'c' }, 2),
    { 'javascript', 'python', 'ruby', 'c' }
  )

  a.deep_equal(
    array.slice({ 'lua', 'javascript', 'python', 'ruby', 'c' }, -2),
    { 'ruby', 'c' }
  )

  a.deep_equal(
    array.slice({ 'lua', 'javascript', 'python', 'ruby', 'c' }, 2, -2),
    { 'javascript', 'python' }
  )
end)

test('reverse', function(a)
  a.deep_equal(
    array.reverse({ 'lua', 'javascript', 'python' }),
    { 'python', 'javascript', 'lua' }
  )
end)

test('map', function(a)
  a.deep_equal(
    array.map({ 1, 2, 3 }, function(value)
      return value * 2
    end),
    { 2, 4, 6 }
  )
end)

test('filter', function(a)
  a.deep_equal(
    array.filter({ 15, 10, 5, 3, 20 }, function(value)
      return value >= 10
    end),
    { 15, 10, 20 }
  )
end)

test('max', function(a)
  a.equal(array.max({ 20, 22, 1, 3, 30, 42 }), 42)
  a.equal(array.max({}), nil)
end)

test('min', function(a)
  a.equal(array.min({ 20, 22, 1, 3, 30, 42 }), 1)
  a.equal(array.min({}), nil)
end)

test('reduce', function(a)
  a.equal(
    array.reduce({ 20, 30, 40 }, function(memo, value)
      return memo + value
    end),
    90
  )

  a.equal(
    array.reduce({ 'a', 'b', 'c', 'd', 'e' }, function(memo, value)
      return memo .. value
    end),
    'abcde'
  )
end)

test('reduce_right', function(a)
  a.equal(
    array.reduce_right({ 20, 30, 40 }, function(memo, value)
      return memo + value
    end),
    90
  )

  a.equal(
    array.reduce_right({ 'a', 'b', 'c', 'd', 'e' }, function(memo, value)
      return memo .. value
    end),
    'edcba'
  )
end)

test('sum', function(a)
  a.equal(
    array.sum({10, 20, 30, 40, 50}),
    150
  )
end)

test('index_of', function(a)
  a.equal(
    array.index_of({ 20, 30, 40, 50 }, 40),
    3
  )

  a.equal(
    array.index_of({ 20, 30, 40 }, 50),
    -1
  )
end)

test('concat', function(a)
  a.deep_equal(
    array.concat({ 1, 2, 3 }, { 4, 5, 6 }),
    { 1, 2, 3, 4, 5, 6 }
  )

  a.deep_equal(
    array.concat({ 'a', 'b', 'c' }, { 'd', 'e' }, { 'f', 'g' }),
    { 'a', 'b', 'c', 'd', 'e', 'f', 'g' }
  )

  a.deep_equal(
    array.concat({ 1, 2, 3 }, { 4, 5 }, { 6, 7 }, { 8, 9 }),
    { 1, 2, 3, 4, 5, 6, 7, 8, 9 }
  )
end)

test('uniq', function(a)
  a.deep_equal(
    array.uniq({ 'a', 'b', 'a', 'b', 'c', 'd' }),
    { 'a', 'b', 'c', 'd' }
  )
end)

test('without', function(a)
  a.deep_equal(
    array.without({ 10, 20, 30, 10, 4 }, { 10, 4 }),
    { 20, 30 }
  )
end)

test('some', function(a)
  a.ok(
    array.some({'a', 'b', 'c'}, function(element)
      if (element == 'b') then return true end
    end)
  )

  a.not_ok(
    array.some({'a', 'b', 'c'}, function(element)
      if (element == 'd') then return true end
    end)
  )
end)

test('zip', function(a)
  a.deep_equal(
    array.zip({ 'a', 'b' }, { 'A', 'B', 'C' }),
    {
      { 'a', 'A' },
      { 'b', 'B' }
    }
  )

  a.deep_equal(
    array.zip({ 'a', 'b' }, { 'A', 'B' }),
    {
      { 'a', 'A' },
      { 'b', 'B' }
    }
  )
end)

test('every', function(a)
  a.not_ok(
    array.every({ 10, 20, 30 }, function(value)
      return value > 10
    end)
  )

  a.ok(
    array.every({ 10, 20, 30 }, function(value)
      return value >= 10
    end)
  )
end)

test('shallow_copy', function(a)
  local obj = {
    { 'a' },
    { 'b' }
  }

  a.deep_equal(
    array.shallow_copy(obj),
    obj
  )
end)

test('deep_copy', function(a)
  local obj = {
    { 'a' },
    { 'b' }
  }

  local result = array.deep_copy(obj)

  a.equal(#result, #obj)
  a.equal(result[1][1], obj[1][1])
  a.equal(result[2][1], obj[2][1])

  obj[1][1] = 'c'
  a.equal(result[1][1], 'a')

  obj[1] = 'c'
  a.equal(type(result[1]), 'table')
end)

test('diff', function(a)
  local result = array.diff(
    { 'a', 'b', 'g', 'z', 'h' },
    { 'a', 'c', 'd', 'e', 'f', 'h', 'x' }
  )

  a.deep_equal(result, { 'b', 'g', 'z' })
end)

test('flat', function(a)
  a.deep_equal(
    array.flat({ 'a', 'b', 'c', { 'd', 'e', 'f', { 'g', 'h' } }, { 'i' }, 'j' }),
    { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j' }
  )

  a.deep_equal(
    array.flat({ 'a', 'b', 'c', { 'd', 'e', 'f', { 'g', 'h' } }, { 'i' }, 'j' }, 1),
    { 'a', 'b', 'c', 'd', 'e', 'f', { 'g', 'h' }, 'i', 'j' }
  )

  a.deep_equal(
    array.flat({ 'a', 'b', 'c', { 'd', 'e', { 'f', { 'g', 'h' } } }, { 'i' }, 'j' }, 2),
    { 'a', 'b', 'c', 'd', 'e', 'f', { 'g', 'h' }, 'i', 'j' }
  )
end)

test('fill', function(a)
  local value = 'Lua'
  local result = array.fill(value, 3, 4)
  a.equal(result[3], value)
  a.equal(result[4], value)

  a.deep_equal(
    array.fill(value, 3),
    { value, value, value }
  )
end)

test('remove', function(a)
  local list = { 1, 2, 3, 4 }
  local result = array.remove(list, function(value)
    return math.fmod(value, 2) == 0
  end)

  a.deep_equal(
    list,
    { 1, 3 }
  )

  a.deep_equal(
    result,
    { 2, 4 }
  )
end)

test('counter', function(a)
  a.deep_equal(
    array.counter({ 'a', 'b', 'a', 'a', 'c', 'b' }),
    { a = 3, b = 2, c = 1 }
  )
end)

test('intersect', function(a)
  local first_list = { 'a', 'b', 'a', 'c', 'e', 'f', 'a' }
  local second_list = { 'b', 'a', 'd', 'a' }

  a.equal(
    #array.intersect(first_list, second_list),
    3
  )
end)

test('from_pairs', function(a)
  a.deep_equal(
    array.from_pairs({ {'a', 1}, {'b', 2} }),
    { a = 1, b = 2 }
  )
end)

test('includes', function(a)
  local list = { 'a', 'b', 'c' }

  a.ok(
    array.includes(list, 'c')
  )

  a.not_ok(
    array.includes(list, 'd')
  )
end)

test('each', function(a)
  local list = { 'a', 'b', 'c' }
  local values = {}
  local keys = {}

  array.each(list, function(v, k)
    table.insert(values, v)
    table.insert(keys, k)
  end)

  a.deep_equal(list, values)
  a.deep_equal(keys, { 1, 2, 3 })
end)

test('reverse_each', function(a)
  local values = {}
  local keys = {}

  array.reverse_each({ 'a', 'b', 'c' }, function(v, k)
    table.insert(values, v)
    table.insert(keys, k)
  end)

  a.deep_equal(values, { 'c', 'b', 'a' })
  a.deep_equal(keys, { 3, 2, 1 })
end)

test('group_by', function(a)
  a.deep_equal(
    array.group_by({ 6.1, 4.1, 6.3, 4.4, 5.1 }, function(item) return math.floor(item) end),
    {
      [4] = { 4.1, 4.4 },
      [6] = { 6.1, 6.3 },
      [5] = { 5.1 }
    }
  )

  a.deep_equal(
    array.group_by({ 'one', 'two', 'three', 'four' }, function(item) return #item end),
    {
      [3] = { 'one', 'two' },
      [5] = { 'three' },
      [4] = { 'four' }
    }
  )
end)

test('random', function(a)
  local list = { 'a', 'b', 'c' }

  a.ok(
    array.includes(list, array.random(list))
  )

  a.equal(array.random({ 'a' }), 'a')
end)

test('permutation', function(a)
  a.deep_equal(
    array.permutation({ 'lua', 'javascript' }),
    {
      { 'lua', 'javascript' },
      { 'javascript', 'lua' },
    }
  )

  a.deep_equal(
    array.permutation({ 'lua', 'javascript', 'ruby' }),
    {
      { 'lua', 'javascript', 'ruby' },
      { 'javascript', 'lua', 'ruby' },
      { 'javascript', 'ruby', 'lua' },
      { 'lua', 'ruby', 'javascript' },
      { 'ruby', 'lua', 'javascript' },
      { 'ruby', 'javascript', 'lua' },
    }
  )
end)

test('chunk', function(a)
  a.deep_equal(
    array.chunk({ 'a', 'b', 'c', 'd', 'e', 'f', 'g' }, 3),
    {
      { 'a', 'b', 'c' },
      { 'd', 'e', 'f' },
      { 'g' },
    }
  )
end)

test('flat_map', function(a)
  a.deep_equal(
    array.flat_map({ 1, 2, 3 }, function(value)
      return { value, value * 2 }
    end),
    { 1, 2, 2, 4, 3, 6 }
  )
end)

test('key_by', function(a)
  a.deep_equal(
    array.key_by({ { id = 1, name = 'lua' }, { id = 2, name = 'javascript' } }, function(item)
      return item.id
    end),
    {
      [1] = { id = 1, name = 'lua' },
      [2] = { id = 2, name = 'javascript' }
    }
  ) 
end)