Change in Ruby's devault encoding breaks test suite with Ruby 2.0

[voxik]

$ testrb -I.:lib test
Run options: -I.:lib

# Running tests:

[107/108] TestXmlEscaping#test_utf8_verbatim = 0.00 s                                                                                 
  1) Failure:
test_utf8_verbatim(TestXmlEscaping) [/builddir/build/BUILD/rubygem-builder-3.1.4/usr/share/gems/gems/builder-3.1.4/test/test_xchar.rb:72]:
<"’"> expected but was
<"\xE2\x80\x99">.

Finished tests in 0.035375s, 3052.9897 tests/s, 5936.3689 assertions/s.
108 tests, 210 assertions, 1 failures, 0 errors, 0 skips

ruby -v: ruby 2.0.0dev (2013-02-14 trunk 39237) [x86_64-linux]

It can be fixed by adding encoding directive # encoding: us-ascii on the second line, not sure that is the right approach though.

[jimweirich]

Thanks.