1) Error:
test_spec {adobe font metrics} 001 [should calculate string width taking into account accented characters](adobe font metrics):
ArgumentError: malformed UTF-8 character (expected 3 bytes, given 1 bytes)
    ./lib/prawn/font/metrics.rb:106:in `unpack'
    ./lib/prawn/font/metrics.rb:106:in `string_width'
    ./spec/metrics_spec.rb:13:in `test_spec {adobe font metrics} 001 [should calculate string width taking into account accented characters]'
    /usr/local/lib/ruby/gems/1.8/gems/mocha-0.5.5/lib/mocha/test_case_adapter.rb:19:in `__send__'
    /usr/local/lib/ruby/gems/1.8/gems/mocha-0.5.5/lib/mocha/test_case_adapter.rb:19:in `run'

  2) Error:
test_spec {adobe font metrics} 002 [should calculate string width taking into account kerning pairs](adobe font metrics):
ArgumentError: malformed UTF-8 character (expected 4 bytes, given 1 bytes)
    ./lib/prawn/font/metrics.rb:106:in `unpack'
    ./lib/prawn/font/metrics.rb:106:in `string_width'
    ./lib/prawn/font/metrics.rb:100:in `string_width'
    ./lib/prawn/font/metrics.rb:106:in `inject'
    ./lib/prawn/font/metrics.rb:98:in `each'
    ./lib/prawn/font/metrics.rb:98:in `inject'
    ./lib/prawn/font/metrics.rb:98:in `string_width'
    ./spec/metrics_spec.rb:19:in `test_spec {adobe font metrics} 002 [should calculate string width taking into account kerning pairs]'
    /usr/local/lib/ruby/gems/1.8/gems/mocha-0.5.5/lib/mocha/test_case_adapter.rb:19:in `__send__'
    /usr/local/lib/ruby/gems/1.8/gems/mocha-0.5.5/lib/mocha/test_case_adapter.rb:19:in `run'

  3) Failure:
test_spec {when drawing text} 011 [should correctly render a utf-8 string when using a built-in font](when drawing text)
    [./spec/text_spec.rb:172:in `test_spec {when drawing text} 011 [should correctly render a utf-8 string when using a built-in font]'
     /usr/local/lib/ruby/gems/1.8/gems/mocha-0.5.5/lib/mocha/test_case_adapter.rb:19:in `__send__'
     /usr/local/lib/ruby/gems/1.8/gems/mocha-0.5.5/lib/mocha/test_case_adapter.rb:19:in `run']:
<"\302\251"> expected but was
<"\302\254\302\251">.