diff --git a/activesupport/test/core_ext/boolean_ext_test.rb b/activesupport/test/core_ext/boolean_ext_test.rb
index 751f7037453d6d568f8b6eaba508c9629501def7..9439716efb372e7c7d59b77398be0b39abc29566 100644
--- a/activesupport/test/core_ext/boolean_ext_test.rb
+++ b/activesupport/test/core_ext/boolean_ext_test.rb
@@ -1,3 +1,6 @@
+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
diff --git a/activesupport/test/core_ext/nil_ext_test.rb b/activesupport/test/core_ext/nil_ext_test.rb
index 945d3af239302e947fd403f9bfa25d7a1859ed6c..1062676d65d810ece6a385f58e0d802af0d34121 100644
--- a/activesupport/test/core_ext/nil_ext_test.rb
+++ b/activesupport/test/core_ext/nil_ext_test.rb
@@ -1,5 +1,8 @@
+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
diff --git a/activesupport/test/core_ext/object_ext_test.rb b/activesupport/test/core_ext/object_ext_test.rb
index 72e3bffa4c99525c1ef9a601dcb397710f4f30fe..484eecaab6c076284b3a7c6f46409413bd7c0741 100644
--- a/activesupport/test/core_ext/object_ext_test.rb
+++ b/activesupport/test/core_ext/object_ext_test.rb
@@ -1,4 +1,6 @@
 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
diff --git a/activesupport/test/core_ext/regexp_ext_test.rb b/activesupport/test/core_ext/regexp_ext_test.rb
index e2d9140bca1e12c0324da16e62b4d814b70596d3..cc3f07d5c5c478c45e3b74bb08c4c5f738b87b05 100644
--- a/activesupport/test/core_ext/regexp_ext_test.rb
+++ b/activesupport/test/core_ext/regexp_ext_test.rb
@@ -1,3 +1,6 @@
+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