require "test_helper"

require "puma/null_io"

class TestNullIO < Minitest::Test
  attr_accessor :nio

  def setup
    self.nio = Puma::NullIO.new
  end

  def test_gets_returns_nil
    assert_nil nio.gets
  end

  def test_each_never_yields
    nio.each { raise "never yield" }
  end

  def test_read_with_no_arguments
    assert_equal "", nio.read
  end

  def test_read_with_nil_length
    assert_equal "", nio.read(nil)
  end

  def test_read_with_zero_length
    assert_equal "", nio.read(0)
  end

  def test_read_with_positive_integer_length
    assert_nil nio.read(1)
  end

  def test_read_with_length_and_buffer
    buf = ""
    assert_nil nio.read(1, buf)
    assert_equal "", buf
  end

  def test_size
    assert_equal 0, nio.size
  end
end