ruby--ruby/test/ruby/test_pipe.rb

# frozen_string_literal: false
require 'test/unit'
require_relative 'ut_eof'

class TestPipe < Test::Unit::TestCase
  include TestEOF
  def open_file(content)
    r, w = IO.pipe
    w << content
    w.close
    begin
      yield r
    ensure
      r.close
    end
  end
  class WithConversion < self
    def open_file(content)
      r, w = IO.pipe
      w << content
      w.close
      r.set_encoding("us-ascii:utf-8")
      begin
        yield r
      ensure
        r.close
      end
    end
  end

  def test_stdout_epipe
    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
    begin;
      io = STDOUT
      begin
        save = io.dup
        IO.popen("echo", "w", out: IO::NULL) do |f|
          io.reopen(f)
          Process.wait(f.pid)
          assert_raise(Errno::EPIPE) do
            io.print "foo\n"
          end
        end
      ensure
        io.reopen(save)
      end
    end;
  end
end