Run Test File result fails if test is skipped/omitted with the following error:
undefined method `exception' for #<Test::Unit::Omission:0x219def0>

Example:

require 'rubygems'
gem 'test-unit'
require 'test/unit'

class TC_MyTests < Test::Unit::TestCase

  def test_02_omit
    puts "Hello 1"
    omit("Skipping ...")
    puts "Hello 2"
  end

end

Output:
Test-unit version : 2.4.5 loaded
Hello 1
undefined method `exception' for #<Test::Unit::Omission:0x1fd8860>


Finished in 0,01 seconds.
0 tests, 0 failures, 0 errors