dash_upper_u_spec.rb

require_relative '../spec_helper'

describe "ruby -U" do
  it "sets Encoding.default_internal to UTF-8" do
    ruby_exe('print Encoding.default_internal.name',
             options: '-U').should == 'UTF-8'
  end

  it "sets Encoding.default_internal to UTF-8 when RUBYOPT is empty or only spaces" do
    ruby_exe('p Encoding.default_internal',
             options: '-U', env: { 'RUBYOPT' => '' }).should == "#<Encoding:UTF-8>\n"
    ruby_exe('p Encoding.default_internal',
             options: '-U', env: { 'RUBYOPT' => '  ' }).should == "#<Encoding:UTF-8>\n"
  end

  it "does nothing different if specified multiple times" do
    ruby_exe('print Encoding.default_internal.name',
             options: '-U -U').should == 'UTF-8'
  end

  it "is overruled by Encoding.default_internal=" do
    ruby_exe('Encoding.default_internal="ascii"; print Encoding.default_internal.name',
             options: '-U').should == 'US-ASCII'
  end

  it "does not affect the default external encoding" do
    ruby_exe('Encoding.default_external="ascii"; print Encoding.default_external.name',
             options: '-U').should == 'US-ASCII'
  end

  it "does not affect the source encoding" do
    ruby_exe("print __ENCODING__.name",
             options: '-U -KE').should == 'EUC-JP'
    ruby_exe("print __ENCODING__.name",
             options: '-KE -U').should == 'EUC-JP'
  end

  # I assume IO redirection will break on Windows...
  it "raises a RuntimeError if used with -Eext:int" do
    ruby_exe("p 1",
             options: '-U -Eascii:ascii',
             args: '2>&1',
             exit_status: 1).should =~ /RuntimeError/
  end

  it "raises a RuntimeError if used with -E:int" do
    ruby_exe("p 1",
             options: '-U -E:ascii',
             args: '2>&1',
             exit_status: 1).should =~ /RuntimeError/
  end
end