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

require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe IO, "#print" do
  before :each do
    @old_separator = $\
    $\ = '->'
    @name = tmp("io_print")
  end

  after :each do
    $\ = @old_separator
    rm_r @name
  end

  it "writes $_.to_s followed by $\\ (if any) to the stream if no arguments given" do
    o = mock('o')
    o.should_receive(:to_s).and_return("mockmockmock")
    $_ = o

    touch(@name) { |f| f.print }
    IO.read(@name).should == "mockmockmock#{$\}"

    # Set $_ to something known
    string = File.open(__FILE__) {|f| f.gets }

    touch(@name) { |f| f.print }
    IO.read(@name).should == "#{string}#{$\}"
  end

  it "calls obj.to_s and not obj.to_str then writes the record separator" do
    o = mock('o')
    o.should_not_receive(:to_str)
    o.should_receive(:to_s).and_return("hello")

    touch(@name) { |f| f.print(o) }

    IO.read(@name).should == "hello#{$\}"
  end

  it "writes each obj.to_s to the stream and appends $\\ (if any) given multiple objects" do
    o, o2 = Object.new, Object.new
    def o.to_s(); 'o'; end
    def o2.to_s(); 'o2'; end

    touch(@name) { |f| f.print(o, o2) }
    IO.read(@name).should == "#{o.to_s}#{o2.to_s}#{$\}"
  end

  it "raises IOError on closed stream" do
    lambda { IOSpecs.closed_io.print("stuff") }.should raise_error(IOError)
  end
end