ruby--ruby/spec/ruby/core/io/initialize_spec.rb

require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "IO#initialize" do
  before :each do
    @name = tmp("io_initialize.txt")
    @io = new_io @name
    @fd = @io.fileno
  end

  after :each do
    @io.close if @io
    rm_r @name
  end

  # File descriptor numbers are not predictable in multi-threaded code;
  # MJIT will be opening/closing files the background
  without_feature :mjit do
    it "reassociates the IO instance with the new descriptor when passed a Fixnum" do
      fd = new_fd @name, "r:utf-8"
      @io.send :initialize, fd, 'r'
      @io.fileno.should == fd
      # initialize has closed the old descriptor
      lambda { IO.for_fd(@fd).close }.should raise_error(Errno::EBADF)
    end

    it "calls #to_int to coerce the object passed as an fd" do
      obj = mock('fileno')
      fd = new_fd @name, "r:utf-8"
      obj.should_receive(:to_int).and_return(fd)
      @io.send :initialize, obj, 'r'
      @io.fileno.should == fd
      # initialize has closed the old descriptor
      lambda { IO.for_fd(@fd).close }.should raise_error(Errno::EBADF)
    end
  end

  it "raises a TypeError when passed an IO" do
    lambda { @io.send :initialize, STDOUT, 'w' }.should raise_error(TypeError)
  end

  it "raises a TypeError when passed nil" do
    lambda { @io.send :initialize, nil, 'w' }.should raise_error(TypeError)
  end

  it "raises a TypeError when passed a String" do
    lambda { @io.send :initialize, "4", 'w' }.should raise_error(TypeError)
  end

  it "raises IOError on closed stream" do
    lambda { @io.send :initialize, IOSpecs.closed_io.fileno }.should raise_error(IOError)
  end

  it "raises an Errno::EBADF when given an invalid file descriptor" do
    lambda { @io.send :initialize, -1, 'w' }.should raise_error(Errno::EBADF)
  end
end