5 files changed, 41 insertions, 2 deletions
diff --git a/activesupport/test/abstract_unit.rb b/activesupport/test/abstract_unit.rb
index 62356e4d46..01e60abd99 100644
--- a/activesupport/test/abstract_unit.rb
+++ b/activesupport/test/abstract_unit.rb
@@ -40,3 +40,5 @@ class ActiveSupport::TestCase
       skip message if defined?(JRUBY_VERSION)
     end
 end
+
+require_relative "../../tools/test_common"
diff --git a/activesupport/test/core_ext/range_ext_test.rb b/activesupport/test/core_ext/range_ext_test.rb
index 4b8efb8a93..16d6a4c2f2 100644
--- a/activesupport/test/core_ext/range_ext_test.rb
+++ b/activesupport/test/core_ext/range_ext_test.rb
@@ -57,7 +57,7 @@ class RangeTest < ActiveSupport::TestCase
   end
 
   def test_should_include_other_with_exclusive_end
-    assert((1..10).include?(1...10))
+    assert((1..10).include?(1...11))
   end
 
   def test_should_compare_identical_inclusive
@@ -69,7 +69,7 @@ class RangeTest < ActiveSupport::TestCase
   end
 
   def test_should_compare_other_with_exclusive_end
-    assert((1..10) === (1...10))
+    assert((1..10) === (1...11))
   end
 
   def test_exclusive_end_should_not_include_identical_with_inclusive_end
@@ -93,6 +93,10 @@ class RangeTest < ActiveSupport::TestCase
     assert range.method(:include?) != range.method(:cover?)
   end
 
+  def test_should_cover_other_with_exclusive_end
+    assert((1..10).cover?(1...11))
+  end
+
   def test_overlaps_on_time
     time_range_1 = Time.utc(2005, 12, 10, 15, 30)..Time.utc(2005, 12, 10, 17, 30)
     time_range_2 = Time.utc(2005, 12, 10, 17, 00)..Time.utc(2005, 12, 10, 18, 00)
diff --git a/activesupport/test/descendants_tracker_test_cases.rb b/activesupport/test/descendants_tracker_test_cases.rb
index 2c94c3c56c..f8752688d2 100644
--- a/activesupport/test/descendants_tracker_test_cases.rb
+++ b/activesupport/test/descendants_tracker_test_cases.rb
@@ -27,6 +27,15 @@ module DescendantsTrackerTestCases
     assert_equal_sets [], Child2.descendants
   end
 
+  def test_descendants_with_garbage_collected_classes
+    1.times do
+      child_klass = Class.new(Parent)
+      assert_equal_sets [Child1, Grandchild1, Grandchild2, Child2, child_klass], Parent.descendants
+    end
+    GC.start
+    assert_equal_sets [Child1, Grandchild1, Grandchild2, Child2], Parent.descendants
+  end
+
   def test_direct_descendants
     assert_equal_sets [Child1, Child2], Parent.direct_descendants
     assert_equal_sets [Grandchild1, Grandchild2], Child1.direct_descendants
diff --git a/activesupport/test/notifications/instrumenter_test.rb b/activesupport/test/notifications/instrumenter_test.rb
index d5c9e82e9f..9729ad5c89 100644
--- a/activesupport/test/notifications/instrumenter_test.rb
+++ b/activesupport/test/notifications/instrumenter_test.rb
@@ -44,6 +44,12 @@ module ActiveSupport
         assert_equal Hash[result: 2], payload
       end
 
+      def test_instrument_works_without_a_block
+        instrumenter.instrument("no.block", payload)
+        assert_equal 1, notifier.finishes.size
+        assert_equal "no.block", notifier.finishes.first.first
+      end
+
       def test_start
         instrumenter.start("foo", payload)
         assert_equal [["foo", instrumenter.id, payload]], notifier.starts
diff --git a/activesupport/test/safe_buffer_test.rb b/activesupport/test/safe_buffer_test.rb
index 32e1d2d5bf..b1a1c2d390 100644
--- a/activesupport/test/safe_buffer_test.rb
+++ b/activesupport/test/safe_buffer_test.rb
@@ -248,4 +248,22 @@ class SafeBufferTest < ActiveSupport::TestCase
     x = "Hello".html_safe
     assert_nil x[/a/, 1]
   end
+
+  test "Should set back references" do
+    a = "foo123".html_safe
+    a2 = a.sub(/([a-z]+)([0-9]+)/) { $2 + $1 }
+    assert_equal "123foo", a2
+    assert_not_predicate a2, :html_safe?
+    a.sub!(/([a-z]+)([0-9]+)/) { $2 + $1 }
+    assert_equal "123foo", a
+    assert_not_predicate a, :html_safe?
+
+    b = "foo123 bar456".html_safe
+    b2 = b.gsub(/([a-z]+)([0-9]+)/) { $2 + $1 }
+    assert_equal "123foo 456bar", b2
+    assert_not_predicate b2, :html_safe?
+    b.gsub!(/([a-z]+)([0-9]+)/) { $2 + $1 }
+    assert_equal "123foo 456bar", b
+    assert_not_predicate b, :html_safe?
+  end
 end