* lib/test/unit.rb: partial revert of r30849. [ruby-core:32864]

* test/testunit/test_rake_integration.rb: adding an integration test
  with the rake loader to prevent regressions.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/testunit/test_rake_integration.rb

@@ -0,0 +1,30 @@
+require 'minitest/autorun'
+require 'tmpdir'
+require_relative '../ruby/envutil'
+
+class RakeIntegration < MiniTest::Unit::TestCase
+  include Test::Unit::Assertions
+  RAKE_LOADER = File.expand_path(
+    File.join(
+    File.dirname(__FILE__),
+    '..',
+    '..',
+    'lib',
+    'rake',
+    'rake_test_loader.rb'))
+
+  def test_with_rake_runner
+    Dir.mktmpdir do |dir|
+      filename = File.join dir, 'testing.rb'
+      File.open(filename, 'wb') do |f|
+        f.write <<-eotest
+require 'test/unit'
+raise 'loaded twice' if defined?(FooTest)
+class FooTest; end
+        eotest
+      end
+
+      assert_ruby_status(%w{ -w } + [RAKE_LOADER, filename])
+    end
+  end
+end