Pathname.rb error on running a minitest testcase

Question

I'm running ruby 1.8.6.

I installed the minitest 1.3.1 gem, which is the new defacto replacement for the Test::Unit framework in Ruby 1.9 The API is supposed to be the same. I wrote a small test to get things rolling

require 'rubygems'
gem 'minitest'
require 'minitest/unit'

MiniTest::Unit.autorun

class CategoryMiniTest < MiniTest::Unit::TestCase
  def test_twoCategoriesCannotHaveSameName
    assert_equals(2,2)
  end
end

which leads to

>ruby test\unit\category_mini_test.rb
l:/ruby_home/lib/ruby/1.8/pathname.rb:709:in `relative_path_from': different prefix: "l:/" and "L:/Gishu/Ruby/Rails/ShowMeTheMoney" (ArgumentError)
        from l:/ruby_home/lib/ruby/gems/1.8/gems/minitest-1.3.1/lib/minitest/unit.rb:17

What gives ?

Answer 1

I can't see anything wrong with your code. It looks almost exactly the same as the Ruby 1.8.6 & MiniTest example in my blog post: Test::Unit and MiniTest with different Ruby versions.

So I wonder if it is (a) something to do with your environment; (b) something to do with how you are running the test; or (c) a bug in MiniTest.

Looking at the error message, I wonder whether the problem is with case-sensitivity - the upper-case and lower-case L drive letters may not match.