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

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

describe "IO#<<" do
  it "writes an object to the IO stream" do
    lambda {
      $stderr << "Oh noes, an error!"
    }.should output_to_fd("Oh noes, an error!", $stderr)
  end

  it "calls #to_s on the object to print it" do
    lambda {
      $stderr << 1337
    }.should output_to_fd("1337", $stderr)
  end

  it "raises an error if the stream is closed" do
    io = IOSpecs.closed_io
    lambda { io << "test" }.should raise_error(IOError)
  end

  it "returns self" do
    lambda {
      ($stderr << "to_stderr").should == $stderr
    }.should output(nil, "to_stderr")
  end
end