4 files changed, 28 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/array/grouping_test.rb b/activesupport/test/core_ext/array/grouping_test.rb
index b8cfe9728c..2eb0f05141 100644
--- a/activesupport/test/core_ext/array/grouping_test.rb
+++ b/activesupport/test/core_ext/array/grouping_test.rb
@@ -90,6 +90,12 @@ class GroupingTest < ActiveSupport::TestCase
     assert_equal [[1, 2, 3], [4, 5], [6, 7]],
       (1..7).to_a.in_groups(3, false)
   end
+
+  def test_in_groups_invalid_argument
+    assert_raises(ArgumentError) { [].in_groups_of(0) }
+    assert_raises(ArgumentError) { [].in_groups_of(-1) }
+    assert_raises(ArgumentError) { [].in_groups_of(nil) }
+  end
 end
 
 class SplitTest < ActiveSupport::TestCase
diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb
index dbbb2d77da..5e9fdfd872 100644
--- a/activesupport/test/core_ext/hash_ext_test.rb
+++ b/activesupport/test/core_ext/hash_ext_test.rb
@@ -586,6 +586,8 @@ class HashExtTest < ActiveSupport::TestCase
     roundtrip = mixed_with_default.with_indifferent_access.to_hash
     assert_equal @strings, roundtrip
     assert_equal '1234', roundtrip.default
+
+    # Ensure nested hashes are not HashWithIndiffereneAccess
     new_to_hash = @nested_mixed.with_indifferent_access.to_hash
     assert_not new_to_hash.instance_of?(HashWithIndifferentAccess)
     assert_not new_to_hash["a"].instance_of?(HashWithIndifferentAccess)
@@ -1516,6 +1518,16 @@ class HashToXmlTest < ActiveSupport::TestCase
     assert_equal expected, Hash.from_trusted_xml('<product><name type="yaml">:value</name></product>')
   end
 
+  def test_should_use_default_proc_for_unknown_key
+    hash_wia = HashWithIndifferentAccess.new { 1 +  2 }
+    assert_equal 3, hash_wia[:new_key]
+  end
+
+  def test_should_use_default_proc_if_no_key_is_supplied
+    hash_wia = HashWithIndifferentAccess.new { 1 +  2 }
+    assert_equal 3, hash_wia.default
+  end
+
   def test_should_use_default_value_for_unknown_key
     hash_wia = HashWithIndifferentAccess.new(3)
     assert_equal 3, hash_wia[:new_key]
diff --git a/activesupport/test/core_ext/object/itself_test.rb b/activesupport/test/core_ext/object/itself_test.rb
new file mode 100644
index 0000000000..65db0ddf40
--- /dev/null
+++ b/activesupport/test/core_ext/object/itself_test.rb
@@ -0,0 +1,9 @@
+require 'abstract_unit'
+require 'active_support/core_ext/object'
+
+class Object::ItselfTest < ActiveSupport::TestCase
+  test 'itself returns self' do
+    object = 'fun'
+    assert_equal object, object.itself
+  end
+end
diff --git a/activesupport/test/core_ext/range_ext_test.rb b/activesupport/test/core_ext/range_ext_test.rb
index cfe31b75e8..98c4ec6b5e 100644
--- a/activesupport/test/core_ext/range_ext_test.rb
+++ b/activesupport/test/core_ext/range_ext_test.rb
@@ -16,6 +16,7 @@ class RangeTest < ActiveSupport::TestCase
   def test_date_range
     assert_instance_of Range, DateTime.new..DateTime.new
     assert_instance_of Range, DateTime::Infinity.new..DateTime::Infinity.new
+    assert_instance_of Range, DateTime.new..DateTime::Infinity.new
   end
 
   def test_overlaps_last_inclusive