Enumerable_test.rb

require_relative "test_helper"

class EnumerableTest < StdlibTest
  target Enumerable

  def test_enum_for
    enumerable.enum_for
    enumerable.enum_for { 0 }
    enumerable.enum_for(:each)
    enumerable.enum_for(:each) { 0 }
  end

  def test_find_all
    enumerable.find_all
    enumerable.find_all { |x| x.even? }
  end

  def test_filter
    enumerable.filter
    enumerable.filter { |x| x.even? }
  end

  def test_grep
    enumerable.grep(-> x { x.even? })
    enumerable.grep(-> x { x.even? }) { |x| x * 2 }
  end

  def test_grep_v
    enumerable.grep_v(-> x { x.even? })
    enumerable.grep_v(-> x { x.even? }) { |x| x * 2 }
  end

  def test_select
    enumerable.select
    enumerable.select { |x| x.even? }
  end

  def test_uniq
    enumerable.uniq
    enumerable.uniq { |x| x.even? }
  end

  def test_sum
    enumerable.sum
    enumerable.sum { |x| x * 2 }
    enumerable.sum(0)
    enumerable.sum('') { |x| x.to_s }
  end

  if Enumerable.public_method_defined?(:filter_map)
    def test_filter_map
      enumerable.filter_map
      enumerable.filter_map { |x| x.even? && x * 2 }
    end
  end

  def test_chain
    enumerable.chain
    enumerable.chain([4, 5])
  end

  def test_take
    enumerable.take(10)
    enumerable.take(0)
  end

  if Enumerable.public_method_defined?(:tally)
    def test_tally
      enumerable.tally
      enumerable.tally({})
    end
  end

  def test_to_h
    enumerable = Class.new {
      def each
        yield [1, 2]
        yield [2, 3]
        yield [3, 4]
      end

      include Enumerable
    }.new
    enumerable.to_h
    enumerable.to_h { |obj| obj }
  end

  def test_each_entry
    enumerable.each_entry
    enumerable.each_entry { |x| x }
  end

  def test_zip
    enumerable.zip([4,5,6])
    enumerable.zip([4,5,6]) { |arr| arr.sum }
  end

  def test_chunk
    enumerable.chunk
    enumerable.chunk { |x| x.even? }
  end

  def test_chunk_while
    enumerable.chunk_while { |elt_before, elt_after| (elt_before & elt_after).zero? }
  end

  def test_slice_when
    enumerable.slice_when { |elt_before, elt_after| (elt_before & elt_after).zero? }
  end

  def test_slice_after
    enumerable.slice_after(1)
    enumerable.slice_after { |elt| elt.even? }
  end

  def test_slice_before
    enumerable.slice_before(1)
    enumerable.slice_before { |elt| elt.even? }
  end

  private

  def enumerable
    Class.new {
      def each
        yield 1
        yield 2
        yield 3
      end

      include Enumerable
    }.new
  end
end

class EnumerableTest2 < Test::Unit::TestCase
  include TestHelper

  class TestEnumerable
    include Enumerable

    def each
      yield '1'
      yield '2'
      yield '3'
      self
    end
  end

  class TestEmptyEnumerable
    include Enumerable

    def each
    end
  end

  testing "::Enumerable[String]"

  def test_chunk
    assert_send_type "() -> ::Enumerator[String, ::Enumerator[[untyped, ::Array[String]], void]]",
                     TestEnumerable.new, :chunk
    assert_send_type "() { (String) -> Integer } -> ::Enumerator[[Integer, ::Array[String]], void]",
                     TestEnumerable.new, :chunk do |x| x.to_i end
  end

  def test_collect_concat
    assert_send_type "() -> ::Enumerator[String, ::Array[untyped]]",
                     TestEnumerable.new, :collect_concat

    assert_send_type "{ (String) -> Integer } -> ::Array[Integer]",
                     TestEnumerable.new, :collect_concat do |x| x.to_i end
    assert_send_type "{ (String) -> ::Array[Integer] } -> ::Array[Integer]",
                     TestEnumerable.new, :collect_concat do |x| [x.to_i] end
  end

  def test_compact
    assert_send_type(
      "() -> Array[String]",
      TestEnumerable.new, :compact
    )
  end

  def test_each_with_object
    assert_send_type "(Integer) -> ::Enumerator[[String, Integer], Integer]",
                     TestEnumerable.new, :each_with_object, 0
    assert_send_type "(Integer) { (String, Integer) -> untyped } -> Integer",
                     TestEnumerable.new, :each_with_object, 0 do end
  end

  def test_each_cons
    assert_send_type(
      "(Integer) { (Array[String]) -> void } -> EnumerableTest2::TestEnumerable",
      TestEnumerable.new, :each_cons, 2
    ) do end
  end

  def test_each_slice
    assert_send_type(
      "(Integer) { (Array[String]) -> void } -> EnumerableTest2::TestEnumerable",
      TestEnumerable.new, :each_slice, 2
    ) do end
  end

  def test_enum_for
    assert_send_type(
      "() ?{ () -> Integer } -> Enumerator[String, EnumerableTest2::TestEnumerable]",
      TestEnumerable.new, :enum_for
    )
  end

  def test_find_index
    assert_send_type "() -> ::Enumerator[String, Integer?]", TestEnumerable.new,
                     :find_index
    assert_send_type "(untyped) -> Integer?", TestEnumerable.new, :find_index,
                     '0'
    assert_send_type "() { (String) -> untyped } -> Integer?",
                     TestEnumerable.new, :find_index do end
  end

  def test_grepv
    assert_send_type "(untyped) -> ::Array[String]", TestEnumerable.new,
                     :grep_v, '0'
    assert_send_type "(untyped) { (String) -> Integer } -> ::Array[Integer]",
                     TestEnumerable.new, :grep_v, '0' do 0 end
  end

  def test_include?
    assert_send_type "(String) -> bool",
                     TestEnumerable.new, :include?, ''
    assert_send_type "(Integer) -> bool",
                     TestEnumerable.new, :include?, 1
  end

  def test_inject
    assert_send_type "(String init, Symbol method) -> untyped", TestEnumerable.new, :inject, +'', :<<
    assert_send_type "(Symbol method) -> String", TestEnumerable.new, :inject, :+
    assert_send_type("(Integer initial) { (Integer, String) -> Integer } -> Integer", TestEnumerable.new, :inject, 0) do |memo, item|
      memo ^ item.hash
    end
    assert_send_type("() { (String, String) -> String } -> String", TestEnumerable.new, :inject) do |memo, item|
      memo + item
    end
  end

  def test_first
    assert_send_type '() -> ::String?' , TestEnumerable.new, :first
    assert_send_type '() -> ::String?' , TestEmptyEnumerable.new, :first
    assert_send_type '(ToInt n) -> ::Array[::String]' , TestEnumerable.new, :first, ToInt.new(42)
    assert_send_type '(ToInt n) -> ::Array[::String]' , TestEmptyEnumerable.new, :first, ToInt.new(42)
  end
end