spec/ruby/language/predefined/data_spec.rb


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require_relative '../../spec_helper'

describe "The DATA constant" do
  it "exists when the main script contains __END__" do
    ruby_exe(fixture(__FILE__, "data1.rb")).chomp.should == "true"
  end

  it "does not exist when the main script contains no __END__" do
    ruby_exe("puts Object.const_defined?(:DATA)").chomp.should == 'false'
  end

  it "does not exist when an included file has a __END__" do
    ruby_exe(fixture(__FILE__, "data2.rb")).chomp.should == "false"
  end

  it "does not change when an included files also has a __END__" do
    ruby_exe(fixture(__FILE__, "data3.rb")).chomp.should == "data 3"
  end

  it "is included in an otherwise empty file" do
    ap = fixture(__FILE__, "print_data.rb")
    str = ruby_exe(fixture(__FILE__, "data_only.rb"), options: "-r#{ap}")
    str.chomp.should == "data only"
  end

  it "returns a File object with the right offset" do
    ruby_exe(fixture(__FILE__, "data_offset.rb")).should == "File\n121\n"
  end

  it "is set even if there is no data after __END__" do
    ruby_exe(fixture(__FILE__, "empty_data.rb")).should == "31\n\"\"\n"
  end

  it "is set even if there is no newline after __END__" do
    path = tmp("no_newline_data.rb")
    code = File.binread(fixture(__FILE__, "empty_data.rb"))
    touch(path, "wb") { |f| f.write code.chomp }
    begin
      ruby_exe(path).should == "30\n\"\"\n"
    ensure
      rm_r path
    end
  end

  it "rewinds to the head of the main script" do
    ruby_exe(fixture(__FILE__, "data5.rb")).chomp.should == "DATA.rewind"
  end
end