Fix failing AS isolated tests

activesupport/test/core_ext/boolean_ext_test.rb

+require 'abstract_unit'
+require 'active_support/core_ext/boolean/conversions'
+
 class BooleanExtAccessTests < Test::Unit::TestCase
   def test_to_param_on_true
     assert_equal true, true.to_param
@@ -6,4 +9,4 @@ def test_to_param_on_true
   def test_to_param_on_false
     assert_equal false, false.to_param
   end
-end
\ No newline at end of file
+end

activesupport/test/core_ext/nil_ext_test.rb

+require 'abstract_unit'
+require 'active_support/core_ext/nil/conversions'
+
 class NilExtAccessTests < Test::Unit::TestCase
   def test_to_param
     assert_nil nil.to_param
   end
-end
\ No newline at end of file
+end

activesupport/test/core_ext/object_ext_test.rb

 require 'abstract_unit'
+require 'active_support/core_ext/object/metaclass'
+require 'active_support/core_ext/object/conversions'
 
 class ObjectExtTest < Test::Unit::TestCase
   def test_tap_yields_and_returns_self

activesupport/test/core_ext/regexp_ext_test.rb

+require 'abstract_unit'
+require 'active_support/core_ext/regexp'
+
 class RegexpExtAccessTests < Test::Unit::TestCase
   def test_number_of_captures
     assert_equal 0, //.number_of_captures
@@ -23,4 +26,4 @@ def test_unoptionalize
     assert_equal "foo", Regexp.unoptionalize("(?:foo)?")
     assert_equal "", Regexp.unoptionalize("")
   end
-end
\ No newline at end of file
+end