adapters.rb in rspec-rails-3.2.0

- old
+ new

@@ -1,8 +1,9 @@
 require 'delegate'
 require 'active_support'
 require 'active_support/concern'
+require 'active_support/core_ext/string'
 
 module RSpec
   module Rails
     if ::Rails::VERSION::STRING >= '4.1.0'
       if defined?(Kernel.gem)
@@ -12,9 +13,47 @@
       end
       require 'minitest/assertions'
       # Constant aliased to either Minitest or TestUnit, depending on what is
       # loaded.
       Assertions = Minitest::Assertions
+    elsif RUBY_VERSION >= '2.2.0'
+      # Minitest / TestUnit has been removed from ruby core. However, we are
+      # on an old Rails version and must load the appropriate gem
+      if ::Rails::VERSION::STRING >= '4.0.0'
+        # ActiveSupport 4.0.x has the minitest '~> 4.2' gem as a dependency
+        # This gem has no `lib/minitest.rb` file.
+        gem 'minitest' if defined?(Kernel.gem)
+        require 'minitest/unit'
+        Assertions = MiniTest::Assertions
+      elsif ::Rails::VERSION::STRING >= '3.2.21'
+        # TODO: Change the above check to >= '3.2.22' once it's released
+        begin
+          # Test::Unit "helpfully" sets up autoload for its `AutoRunner`.
+          # While we do not reference it directly, when we load the `TestCase`
+          # classes from AS (ActiveSupport), AS kindly references `AutoRunner`
+          # for everyone.
+          #
+          # To handle this we need to pre-emptively load 'test/unit' and make
+          # sure the version installed has `AutoRunner` (the 3.x line does to
+          # date). If so, we turn the auto runner off.
+          require 'test/unit'
+          require 'test/unit/assertions'
+          Test::Unit::AutoRunner.need_auto_run = false if defined?(Test::Unit::AutoRunner)
+        rescue LoadError => e
+          raise LoadError, <<-ERR.squish, e.backtrace
+            Ruby 2.2+ has removed test/unit from the core library. Rails
+            requires this as a dependency. Please add test-unit gem to your
+            Gemfile: `gem 'test-unit', '~> 3.0'` (#{e.message})"
+          ERR
+        end
+        Assertions = Test::Unit::Assertions
+      else
+        abort <<-MSG.squish
+          Ruby 2.2+ is not supported on Rails #{::Rails::VERSION::STRING}.
+          Check the Rails release notes for the appropriate update with
+          support.
+        MSG
+      end
     else
       begin
         require 'test/unit/assertions'
       rescue LoadError
         # work around for Rubinius not having a std std-lib