ruby_version_is "1.9" do
  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 "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').should =~ /RuntimeError/
    end

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