diff --git a/activesupport/test/core_ext/array/access_test.rb b/activesupport/test/core_ext/array/access_test.rb
new file mode 100644
index 0000000000..f14f64421d
--- /dev/null
+++ b/activesupport/test/core_ext/array/access_test.rb
@@ -0,0 +1,30 @@
+require 'abstract_unit'
+require 'active_support/core_ext/array'
+
+class AccessTest < ActiveSupport::TestCase
+  def test_from
+    assert_equal %w( a b c d ), %w( a b c d ).from(0)
+    assert_equal %w( c d ), %w( a b c d ).from(2)
+    assert_equal %w(), %w( a b c d ).from(10)
+    assert_equal %w( d e ), %w( a b c d e ).from(-2)
+    assert_equal %w(), %w( a b c d e ).from(-10)
+  end
+
+  def test_to
+    assert_equal %w( a ), %w( a b c d ).to(0)
+    assert_equal %w( a b c ), %w( a b c d ).to(2)
+    assert_equal %w( a b c d ), %w( a b c d ).to(10)
+    assert_equal %w( a b c ), %w( a b c d ).to(-2)
+    assert_equal %w(), %w( a b c ).to(-10)
+  end
+
+  def test_specific_accessor
+    array = (1..42).to_a
+
+    assert_equal array[1], array.second
+    assert_equal array[2], array.third
+    assert_equal array[3], array.fourth
+    assert_equal array[4], array.fifth
+    assert_equal array[41], array.forty_two
+  end
+end
diff --git a/activesupport/test/core_ext/array/conversions_test.rb b/activesupport/test/core_ext/array/conversions_test.rb
new file mode 100644
index 0000000000..51ad9897da
--- /dev/null
+++ b/activesupport/test/core_ext/array/conversions_test.rb
@@ -0,0 +1,211 @@
+require 'abstract_unit'
+require 'active_support/core_ext/array'
+require 'active_support/core_ext/big_decimal'
+require 'active_support/core_ext/hash'
+require 'active_support/core_ext/string'
+
+class ToSentenceTest < ActiveSupport::TestCase
+  def test_plain_array_to_sentence
+    assert_equal "", [].to_sentence
+    assert_equal "one", ['one'].to_sentence
+    assert_equal "one and two", ['one', 'two'].to_sentence
+    assert_equal "one, two, and three", ['one', 'two', 'three'].to_sentence
+  end
+
+  def test_to_sentence_with_words_connector
+    assert_equal "one two, and three", ['one', 'two', 'three'].to_sentence(words_connector: ' ')
+    assert_equal "one & two, and three", ['one', 'two', 'three'].to_sentence(words_connector: ' & ')
+    assert_equal "onetwo, and three", ['one', 'two', 'three'].to_sentence(words_connector: nil)
+  end
+
+  def test_to_sentence_with_last_word_connector
+    assert_equal "one, two, and also three", ['one', 'two', 'three'].to_sentence(last_word_connector: ', and also ')
+    assert_equal "one, twothree", ['one', 'two', 'three'].to_sentence(last_word_connector: nil)
+    assert_equal "one, two three", ['one', 'two', 'three'].to_sentence(last_word_connector: ' ')
+    assert_equal "one, two and three", ['one', 'two', 'three'].to_sentence(last_word_connector: ' and ')
+  end
+
+  def test_two_elements
+    assert_equal "one and two", ['one', 'two'].to_sentence
+    assert_equal "one two", ['one', 'two'].to_sentence(two_words_connector: ' ')
+  end
+
+  def test_one_element
+    assert_equal "one", ['one'].to_sentence
+  end
+
+  def test_one_element_not_same_object
+    elements = ["one"]
+    assert_not_equal elements[0].object_id, elements.to_sentence.object_id
+  end
+
+  def test_one_non_string_element
+    assert_equal '1', [1].to_sentence
+  end
+
+  def test_does_not_modify_given_hash
+    options = { words_connector: ' ' }
+    assert_equal "one two, and three", ['one', 'two', 'three'].to_sentence(options)
+    assert_equal({ words_connector: ' ' }, options)
+  end
+
+  def test_with_blank_elements
+    assert_equal ", one, , two, and three", [nil, 'one', '', 'two', 'three'].to_sentence
+  end
+end
+
+class ToSTest < ActiveSupport::TestCase
+  class TestDB
+    @@counter = 0
+    def id
+      @@counter += 1
+    end
+  end
+
+  def test_to_s_db
+    collection = [TestDB.new, TestDB.new, TestDB.new]
+
+    assert_equal "null", [].to_s(:db)
+    assert_equal "1,2,3", collection.to_s(:db)
+  end
+end
+
+class ToXmlTest < ActiveSupport::TestCase
+  def test_to_xml_with_hash_elements
+    xml = [
+      { name: "David", age: 26, age_in_millis: 820497600000 },
+      { name: "Jason", age: 31, age_in_millis: BigDecimal.new('1.0') }
+    ].to_xml(skip_instruct: true, indent: 0)
+
+    assert_equal '<objects type="array"><object>', xml.first(30)
+    assert xml.include?(%(<age type="integer">26</age>)), xml
+    assert xml.include?(%(<age-in-millis type="integer">820497600000</age-in-millis>)), xml
+    assert xml.include?(%(<name>David</name>)), xml
+    assert xml.include?(%(<age type="integer">31</age>)), xml
+    assert xml.include?(%(<age-in-millis type="decimal">1.0</age-in-millis>)), xml
+    assert xml.include?(%(<name>Jason</name>)), xml
+  end
+
+  def test_to_xml_with_non_hash_elements
+    xml = [1, 2, 3].to_xml(skip_instruct: true, indent: 0)
+
+    assert_equal '<fixnums type="array"><fixnum', xml.first(29)
+    assert xml.include?(%(<fixnum type="integer">2</fixnum>)), xml
+  end
+
+  def test_to_xml_with_non_hash_different_type_elements
+    xml = [1, 2.0, '3'].to_xml(skip_instruct: true, indent: 0)
+
+    assert_equal '<objects type="array"><object', xml.first(29)
+    assert xml.include?(%(<object type="integer">1</object>)), xml
+    assert xml.include?(%(<object type="float">2.0</object>)), xml
+    assert xml.include?(%(object>3</object>)), xml
+  end
+
+  def test_to_xml_with_dedicated_name
+    xml = [
+      { name: "David", age: 26, age_in_millis: 820497600000 }, { name: "Jason", age: 31 }
+    ].to_xml(skip_instruct: true, indent: 0, root: "people")
+
+    assert_equal '<people type="array"><person>', xml.first(29)
+  end
+
+  def test_to_xml_with_options
+    xml = [
+      { name: "David", street_address: "Paulina" }, { name: "Jason", street_address: "Evergreen" }
+    ].to_xml(skip_instruct: true, skip_types: true, indent: 0)
+
+    assert_equal "<objects><object>", xml.first(17)
+    assert xml.include?(%(<street-address>Paulina</street-address>))
+    assert xml.include?(%(<name>David</name>))
+    assert xml.include?(%(<street-address>Evergreen</street-address>))
+    assert xml.include?(%(<name>Jason</name>))
+  end
+
+  def test_to_xml_with_indent_set
+    xml = [
+      { name: "David", street_address: "Paulina" }, { name: "Jason", street_address: "Evergreen" }
+    ].to_xml(skip_instruct: true, skip_types: true, indent: 4)
+
+    assert_equal "<objects>\n    <object>", xml.first(22)
+    assert xml.include?(%(\n        <street-address>Paulina</street-address>))
+    assert xml.include?(%(\n        <name>David</name>))
+    assert xml.include?(%(\n        <street-address>Evergreen</street-address>))
+    assert xml.include?(%(\n        <name>Jason</name>))
+  end
+
+  def test_to_xml_with_dasherize_false
+    xml = [
+      { name: "David", street_address: "Paulina" }, { name: "Jason", street_address: "Evergreen" }
+    ].to_xml(skip_instruct: true, skip_types: true, indent: 0, dasherize: false)
+
+    assert_equal "<objects><object>", xml.first(17)
+    assert xml.include?(%(<street_address>Paulina</street_address>))
+    assert xml.include?(%(<street_address>Evergreen</street_address>))
+  end
+
+  def test_to_xml_with_dasherize_true
+    xml = [
+      { name: "David", street_address: "Paulina" }, { name: "Jason", street_address: "Evergreen" }
+    ].to_xml(skip_instruct: true, skip_types: true, indent: 0, dasherize: true)
+
+    assert_equal "<objects><object>", xml.first(17)
+    assert xml.include?(%(<street-address>Paulina</street-address>))
+    assert xml.include?(%(<street-address>Evergreen</street-address>))
+  end
+
+  def test_to_xml_with_instruct
+    xml = [
+      { name: "David", age: 26, age_in_millis: 820497600000 },
+      { name: "Jason", age: 31, age_in_millis: BigDecimal.new('1.0') }
+    ].to_xml(skip_instruct: false, indent: 0)
+
+    assert_match(/^<\?xml [^>]*/, xml)
+    assert_equal 0, xml.rindex(/<\?xml /)
+  end
+
+  def test_to_xml_with_block
+    xml = [
+      { name: "David", age: 26, age_in_millis: 820497600000 },
+      { name: "Jason", age: 31, age_in_millis: BigDecimal.new('1.0') }
+    ].to_xml(skip_instruct: true, indent: 0) do |builder|
+      builder.count 2
+    end
+
+    assert xml.include?(%(<count>2</count>)), xml
+  end
+
+  def test_to_xml_with_empty
+    xml = [].to_xml
+    assert_match(/type="array"\/>/, xml)
+  end
+
+  def test_to_xml_dups_options
+    options = { skip_instruct: true }
+    [].to_xml(options)
+    # :builder, etc, shouldn't be added to options
+    assert_equal({ skip_instruct: true }, options)
+  end
+end
+
+class ToParamTest < ActiveSupport::TestCase
+  class ToParam < String
+    def to_param
+      "#{self}1"
+    end
+  end
+
+  def test_string_array
+    assert_equal '', %w().to_param
+    assert_equal 'hello/world', %w(hello world).to_param
+    assert_equal 'hello/10', %w(hello 10).to_param
+  end
+
+  def test_number_array
+    assert_equal '10/20', [10, 20].to_param
+  end
+
+  def test_to_param_array
+    assert_equal 'custom1/param1', [ToParam.new('custom'), ToParam.new('param')].to_param
+  end
+end
diff --git a/activesupport/test/core_ext/array/extract_options_test.rb b/activesupport/test/core_ext/array/extract_options_test.rb
new file mode 100644
index 0000000000..0481a507cf
--- /dev/null
+++ b/activesupport/test/core_ext/array/extract_options_test.rb
@@ -0,0 +1,45 @@
+require 'abstract_unit'
+require 'active_support/core_ext/array'
+require 'active_support/core_ext/hash'
+
+class ExtractOptionsTest < ActiveSupport::TestCase
+  class HashSubclass < Hash
+  end
+
+  class ExtractableHashSubclass < Hash
+    def extractable_options?
+      true
+    end
+  end
+
+  def test_extract_options
+    assert_equal({}, [].extract_options!)
+    assert_equal({}, [1].extract_options!)
+    assert_equal({ a: :b }, [{ a: :b }].extract_options!)
+    assert_equal({ a: :b }, [1, { a: :b }].extract_options!)
+  end
+
+  def test_extract_options_doesnt_extract_hash_subclasses
+    hash = HashSubclass.new
+    hash[:foo] = 1
+    array = [hash]
+    options = array.extract_options!
+    assert_equal({}, options)
+    assert_equal([hash], array)
+  end
+
+  def test_extract_options_extracts_extractable_subclass
+    hash = ExtractableHashSubclass.new
+    hash[:foo] = 1
+    array = [hash]
+    options = array.extract_options!
+    assert_equal({ foo: 1 }, options)
+    assert_equal([], array)
+  end
+
+  def test_extract_options_extracts_hash_with_indifferent_access
+    array = [{ foo: 1 }.with_indifferent_access]
+    options = array.extract_options!
+    assert_equal(1, options[:foo])
+  end
+end
diff --git a/activesupport/test/core_ext/array/grouping_test.rb b/activesupport/test/core_ext/array/grouping_test.rb
new file mode 100644
index 0000000000..b8cfe9728c
--- /dev/null
+++ b/activesupport/test/core_ext/array/grouping_test.rb
@@ -0,0 +1,120 @@
+require 'abstract_unit'
+require 'active_support/core_ext/array'
+
+class GroupingTest < ActiveSupport::TestCase
+  def setup
+    Fixnum.send :private, :/  # test we avoid Integer#/ (redefined by mathn)
+  end
+
+  def teardown
+    Fixnum.send :public, :/
+  end
+
+  def test_in_groups_of_with_perfect_fit
+    groups = []
+    ('a'..'i').to_a.in_groups_of(3) do |group|
+      groups << group
+    end
+
+    assert_equal [%w(a b c), %w(d e f), %w(g h i)], groups
+    assert_equal [%w(a b c), %w(d e f), %w(g h i)], ('a'..'i').to_a.in_groups_of(3)
+  end
+
+  def test_in_groups_of_with_padding
+    groups = []
+    ('a'..'g').to_a.in_groups_of(3) do |group|
+      groups << group
+    end
+
+    assert_equal [%w(a b c), %w(d e f), ['g', nil, nil]], groups
+  end
+
+  def test_in_groups_of_pads_with_specified_values
+    groups = []
+
+    ('a'..'g').to_a.in_groups_of(3, 'foo') do |group|
+      groups << group
+    end
+
+    assert_equal [%w(a b c), %w(d e f), %w(g foo foo)], groups
+  end
+
+  def test_in_groups_of_without_padding
+    groups = []
+
+    ('a'..'g').to_a.in_groups_of(3, false) do |group|
+      groups << group
+    end
+
+    assert_equal [%w(a b c), %w(d e f), %w(g)], groups
+  end
+
+  def test_in_groups_returned_array_size
+    array = (1..7).to_a
+
+    1.upto(array.size + 1) do |number|
+      assert_equal number, array.in_groups(number).size
+    end
+  end
+
+  def test_in_groups_with_empty_array
+    assert_equal [[], [], []], [].in_groups(3)
+  end
+
+  def test_in_groups_with_block
+    array = (1..9).to_a
+    groups = []
+
+    array.in_groups(3) do |group|
+      groups << group
+    end
+
+    assert_equal array.in_groups(3), groups
+  end
+
+  def test_in_groups_with_perfect_fit
+    assert_equal [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
+      (1..9).to_a.in_groups(3)
+  end
+
+  def test_in_groups_with_padding
+    array = (1..7).to_a
+
+    assert_equal [[1, 2, 3], [4, 5, nil], [6, 7, nil]],
+      array.in_groups(3)
+    assert_equal [[1, 2, 3], [4, 5, 'foo'], [6, 7, 'foo']],
+      array.in_groups(3, 'foo')
+  end
+
+  def test_in_groups_without_padding
+    assert_equal [[1, 2, 3], [4, 5], [6, 7]],
+      (1..7).to_a.in_groups(3, false)
+  end
+end
+
+class SplitTest < ActiveSupport::TestCase
+  def test_split_with_empty_array
+    assert_equal [[]], [].split(0)
+  end
+
+  def test_split_with_argument
+    a = [1, 2, 3, 4, 5]
+    assert_equal [[1, 2], [4, 5]],  a.split(3)
+    assert_equal [[1, 2, 3, 4, 5]], a.split(0)
+    assert_equal [1, 2, 3, 4, 5], a
+  end
+
+  def test_split_with_block
+    a = (1..10).to_a
+    assert_equal [[1, 2], [4, 5], [7, 8], [10]], a.split { |i| i % 3 == 0 }
+    assert_equal [1, 2, 3, 4, 5, 6, 7, 8, 9 ,10], a
+  end
+
+  def test_split_with_edge_values
+    a = [1, 2, 3, 4, 5]
+    assert_equal [[], [2, 3, 4, 5]],  a.split(1)
+    assert_equal [[1, 2, 3, 4], []],  a.split(5)
+    assert_equal [[], [2, 3, 4], []], a.split { |i| i == 1 || i == 5 }
+    assert_equal [1, 2, 3, 4, 5], a
+  end
+end
diff --git a/activesupport/test/core_ext/array/prepend_append_test.rb b/activesupport/test/core_ext/array/prepend_append_test.rb
new file mode 100644
index 0000000000..762aa69b2b
--- /dev/null
+++ b/activesupport/test/core_ext/array/prepend_append_test.rb
@@ -0,0 +1,12 @@
+require 'abstract_unit'
+require 'active_support/core_ext/array'
+
+class PrependAppendTest < ActiveSupport::TestCase
+  def test_append
+    assert_equal [1, 2], [1].append(2)
+  end
+
+  def test_prepend
+    assert_equal [2, 1], [1].prepend(2)
+  end
+end
diff --git a/activesupport/test/core_ext/array/wrap_test.rb b/activesupport/test/core_ext/array/wrap_test.rb
new file mode 100644
index 0000000000..baf426506f
--- /dev/null
+++ b/activesupport/test/core_ext/array/wrap_test.rb
@@ -0,0 +1,77 @@
+require 'abstract_unit'
+require 'active_support/core_ext/array'
+
+class WrapTest < ActiveSupport::TestCase
+  class FakeCollection
+    def to_ary
+      ["foo", "bar"]
+    end
+  end
+
+  class Proxy
+    def initialize(target) @target = target end
+    def method_missing(*a) @target.send(*a) end
+  end
+
+  class DoubtfulToAry
+    def to_ary
+      :not_an_array
+    end
+  end
+
+  class NilToAry
+    def to_ary
+      nil
+    end
+  end
+
+  def test_array
+    ary = %w(foo bar)
+    assert_same ary, Array.wrap(ary)
+  end
+
+  def test_nil
+    assert_equal [], Array.wrap(nil)
+  end
+
+  def test_object
+    o = Object.new
+    assert_equal [o], Array.wrap(o)
+  end
+
+  def test_string
+    assert_equal ["foo"], Array.wrap("foo")
+  end
+
+  def test_string_with_newline
+    assert_equal ["foo\nbar"], Array.wrap("foo\nbar")
+  end
+
+  def test_object_with_to_ary
+    assert_equal ["foo", "bar"], Array.wrap(FakeCollection.new)
+  end
+
+  def test_proxy_object
+    p = Proxy.new(Object.new)
+    assert_equal [p], Array.wrap(p)
+  end
+
+  def test_proxy_to_object_with_to_ary
+    p = Proxy.new(FakeCollection.new)
+    assert_equal [p], Array.wrap(p)
+  end
+
+  def test_struct
+    o = Struct.new(:foo).new(123)
+    assert_equal [o], Array.wrap(o)
+  end
+
+  def test_wrap_returns_wrapped_if_to_ary_returns_nil
+    o = NilToAry.new
+    assert_equal [o], Array.wrap(o)
+  end
+
+  def test_wrap_does_not_complain_if_to_ary_does_not_return_an_array
+    assert_equal DoubtfulToAry.new.to_ary, Array.wrap(DoubtfulToAry.new)
+  end
+end
diff --git a/activesupport/test/core_ext/array_ext_test.rb b/activesupport/test/core_ext/array_ext_test.rb
deleted file mode 100644
index bd1b818717..0000000000
--- a/activesupport/test/core_ext/array_ext_test.rb
+++ /dev/null
@@ -1,482 +0,0 @@
-require 'abstract_unit'
-require 'active_support/core_ext/array'
-require 'active_support/core_ext/big_decimal'
-require 'active_support/core_ext/hash'
-require 'active_support/core_ext/object/conversions'
-require 'active_support/core_ext/string'
-
-class ArrayExtAccessTests < ActiveSupport::TestCase
-  def test_from
-    assert_equal %w( a b c d ), %w( a b c d ).from(0)
-    assert_equal %w( c d ), %w( a b c d ).from(2)
-    assert_equal %w(), %w( a b c d ).from(10)
-    assert_equal %w( d e ), %w( a b c d e ).from(-2)
-    assert_equal %w(), %w( a b c d e ).from(-10)
-  end
-
-  def test_to
-    assert_equal %w( a ), %w( a b c d ).to(0)
-    assert_equal %w( a b c ), %w( a b c d ).to(2)
-    assert_equal %w( a b c d ), %w( a b c d ).to(10)
-    assert_equal %w( a b c ), %w( a b c d ).to(-2)
-    assert_equal %w(), %w( a b c ).to(-10)
-  end
-
-  def test_second_through_tenth
-    array = (1..42).to_a
-
-    assert_equal array[1], array.second
-    assert_equal array[2], array.third
-    assert_equal array[3], array.fourth
-    assert_equal array[4], array.fifth
-    assert_equal array[41], array.forty_two
-  end
-end
-
-class ArrayExtToParamTests < ActiveSupport::TestCase
-  class ToParam < String
-    def to_param
-      "#{self}1"
-    end
-  end
-
-  def test_string_array
-    assert_equal '', %w().to_param
-    assert_equal 'hello/world', %w(hello world).to_param
-    assert_equal 'hello/10', %w(hello 10).to_param
-  end
-
-  def test_number_array
-    assert_equal '10/20', [10, 20].to_param
-  end
-
-  def test_to_param_array
-    assert_equal 'custom1/param1', [ToParam.new('custom'), ToParam.new('param')].to_param
-  end
-end
-
-class ArrayExtToSentenceTests < ActiveSupport::TestCase
-  def test_plain_array_to_sentence
-    assert_equal "", [].to_sentence
-    assert_equal "one", ['one'].to_sentence
-    assert_equal "one and two", ['one', 'two'].to_sentence
-    assert_equal "one, two, and three", ['one', 'two', 'three'].to_sentence
-  end
-
-  def test_to_sentence_with_words_connector
-    assert_equal "one two, and three", ['one', 'two', 'three'].to_sentence(:words_connector => ' ')
-    assert_equal "one & two, and three", ['one', 'two', 'three'].to_sentence(:words_connector => ' & ')
-    assert_equal "onetwo, and three", ['one', 'two', 'three'].to_sentence(:words_connector => nil)
-  end
-
-  def test_to_sentence_with_last_word_connector
-    assert_equal "one, two, and also three", ['one', 'two', 'three'].to_sentence(:last_word_connector => ', and also ')
-    assert_equal "one, twothree", ['one', 'two', 'three'].to_sentence(:last_word_connector => nil)
-    assert_equal "one, two three", ['one', 'two', 'three'].to_sentence(:last_word_connector => ' ')
-    assert_equal "one, two and three", ['one', 'two', 'three'].to_sentence(:last_word_connector => ' and ')
-  end
-
-  def test_two_elements
-    assert_equal "one and two", ['one', 'two'].to_sentence
-    assert_equal "one two", ['one', 'two'].to_sentence(:two_words_connector => ' ')
-  end
-
-  def test_one_element
-    assert_equal "one", ['one'].to_sentence
-  end
-
-  def test_one_element_not_same_object
-    elements = ["one"]
-    assert_not_equal elements[0].object_id, elements.to_sentence.object_id
-  end
-
-  def test_one_non_string_element
-    assert_equal '1', [1].to_sentence
-  end
-
-  def test_does_not_modify_given_hash
-    options = { words_connector: ' ' }
-    assert_equal "one two, and three", ['one', 'two', 'three'].to_sentence(options)
-    assert_equal({ words_connector: ' ' }, options)
-  end
-
-  def test_with_blank_elements
-    assert_equal ", one, , two, and three", [nil, 'one', '', 'two', 'three'].to_sentence
-  end
-end
-
-class ArrayExtToSTests < ActiveSupport::TestCase
-  def test_to_s_db
-    collection = [
-      Class.new { def id() 1 end }.new,
-      Class.new { def id() 2 end }.new,
-      Class.new { def id() 3 end }.new
-    ]
-
-    assert_equal "null", [].to_s(:db)
-    assert_equal "1,2,3", collection.to_s(:db)
-  end
-end
-
-class ArrayExtGroupingTests < ActiveSupport::TestCase
-  def setup
-    Fixnum.send :private, :/  # test we avoid Integer#/ (redefined by mathn)
-  end
-
-  def teardown
-    Fixnum.send :public, :/
-  end
-
-  def test_in_groups_of_with_perfect_fit
-    groups = []
-    ('a'..'i').to_a.in_groups_of(3) do |group|
-      groups << group
-    end
-
-    assert_equal [%w(a b c), %w(d e f), %w(g h i)], groups
-    assert_equal [%w(a b c), %w(d e f), %w(g h i)], ('a'..'i').to_a.in_groups_of(3)
-  end
-
-  def test_in_groups_of_with_padding
-    groups = []
-    ('a'..'g').to_a.in_groups_of(3) do |group|
-      groups << group
-    end
-
-    assert_equal [%w(a b c), %w(d e f), ['g', nil, nil]], groups
-  end
-
-  def test_in_groups_of_pads_with_specified_values
-    groups = []
-
-    ('a'..'g').to_a.in_groups_of(3, 'foo') do |group|
-      groups << group
-    end
-
-    assert_equal [%w(a b c), %w(d e f), ['g', 'foo', 'foo']], groups
-  end
-
-  def test_in_groups_of_without_padding
-    groups = []
-
-    ('a'..'g').to_a.in_groups_of(3, false) do |group|
-      groups << group
-    end
-
-    assert_equal [%w(a b c), %w(d e f), ['g']], groups
-  end
-
-  def test_in_groups_returned_array_size
-    array = (1..7).to_a
-
-    1.upto(array.size + 1) do |number|
-      assert_equal number, array.in_groups(number).size
-    end
-  end
-
-  def test_in_groups_with_empty_array
-    assert_equal [[], [], []], [].in_groups(3)
-  end
-
-  def test_in_groups_with_block
-    array = (1..9).to_a
-    groups = []
-
-    array.in_groups(3) do |group|
-      groups << group
-    end
-
-    assert_equal array.in_groups(3), groups
-  end
-
-  def test_in_groups_with_perfect_fit
-    assert_equal [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
-      (1..9).to_a.in_groups(3)
-  end
-
-  def test_in_groups_with_padding
-    array = (1..7).to_a
-
-    assert_equal [[1, 2, 3], [4, 5, nil], [6, 7, nil]],
-      array.in_groups(3)
-    assert_equal [[1, 2, 3], [4, 5, 'foo'], [6, 7, 'foo']],
-      array.in_groups(3, 'foo')
-  end
-
-  def test_in_groups_without_padding
-    assert_equal [[1, 2, 3], [4, 5], [6, 7]],
-      (1..7).to_a.in_groups(3, false)
-  end
-end
-
-class ArraySplitTests < ActiveSupport::TestCase
-  def test_split_with_empty_array
-    assert_equal [[]], [].split(0)
-  end
-
-  def test_split_with_argument
-    a = [1, 2, 3, 4, 5]
-    assert_equal [[1, 2], [4, 5]],  a.split(3)
-    assert_equal [[1, 2, 3, 4, 5]], a.split(0)
-    assert_equal [1, 2, 3, 4, 5], a
-  end
-
-  def test_split_with_block
-    a = (1..10).to_a
-    assert_equal [[1, 2], [4, 5], [7, 8], [10]], a.split { |i| i % 3 == 0 }
-    assert_equal [1, 2, 3, 4, 5, 6, 7, 8, 9 ,10], a
-  end
-
-  def test_split_with_edge_values
-    a = [1, 2, 3, 4, 5]
-    assert_equal [[], [2, 3, 4, 5]],  a.split(1)
-    assert_equal [[1, 2, 3, 4], []],  a.split(5)
-    assert_equal [[], [2, 3, 4], []], a.split { |i| i == 1 || i == 5 }
-    assert_equal [1, 2, 3, 4, 5], a
-  end
-end
-
-class ArrayToXmlTests < ActiveSupport::TestCase
-  def test_to_xml_with_hash_elements
-    xml = [
-      { :name => "David", :age => 26, :age_in_millis => 820497600000 },
-      { :name => "Jason", :age => 31, :age_in_millis => BigDecimal.new('1.0') }
-    ].to_xml(:skip_instruct => true, :indent => 0)
-
-    assert_equal '<objects type="array"><object>', xml.first(30)
-    assert xml.include?(%(<age type="integer">26</age>)), xml
-    assert xml.include?(%(<age-in-millis type="integer">820497600000</age-in-millis>)), xml
-    assert xml.include?(%(<name>David</name>)), xml
-    assert xml.include?(%(<age type="integer">31</age>)), xml
-    assert xml.include?(%(<age-in-millis type="decimal">1.0</age-in-millis>)), xml
-    assert xml.include?(%(<name>Jason</name>)), xml
-  end
-
-  def test_to_xml_with_non_hash_elements
-    xml = [1, 2, 3].to_xml(:skip_instruct => true, :indent => 0)
-
-    assert_equal '<fixnums type="array"><fixnum', xml.first(29)
-    assert xml.include?(%(<fixnum type="integer">2</fixnum>)), xml
-  end
-
-  def test_to_xml_with_non_hash_different_type_elements
-    xml = [1, 2.0, '3'].to_xml(:skip_instruct => true, :indent => 0)
-
-    assert_equal '<objects type="array"><object', xml.first(29)
-    assert xml.include?(%(<object type="integer">1</object>)), xml
-    assert xml.include?(%(<object type="float">2.0</object>)), xml
-    assert xml.include?(%(object>3</object>)), xml
-  end
-
-  def test_to_xml_with_dedicated_name
-    xml = [
-      { :name => "David", :age => 26, :age_in_millis => 820497600000 }, { :name => "Jason", :age => 31 }
-    ].to_xml(:skip_instruct => true, :indent => 0, :root => "people")
-
-    assert_equal '<people type="array"><person>', xml.first(29)
-  end
-
-  def test_to_xml_with_options
-    xml = [
-      { :name => "David", :street_address => "Paulina" }, { :name => "Jason", :street_address => "Evergreen" }
-    ].to_xml(:skip_instruct => true, :skip_types => true, :indent => 0)
-
-    assert_equal "<objects><object>", xml.first(17)
-    assert xml.include?(%(<street-address>Paulina</street-address>))
-    assert xml.include?(%(<name>David</name>))
-    assert xml.include?(%(<street-address>Evergreen</street-address>))
-    assert xml.include?(%(<name>Jason</name>))
-  end
-
-  def test_to_xml_with_indent_set
-    xml = [
-      { :name => "David", :street_address => "Paulina" }, { :name => "Jason", :street_address => "Evergreen" }
-    ].to_xml(:skip_instruct => true, :skip_types => true, :indent => 4)
-
-    assert_equal "<objects>\n    <object>", xml.first(22)
-    assert xml.include?(%(\n        <street-address>Paulina</street-address>))
-    assert xml.include?(%(\n        <name>David</name>))
-    assert xml.include?(%(\n        <street-address>Evergreen</street-address>))
-    assert xml.include?(%(\n        <name>Jason</name>))
-  end
-
-  def test_to_xml_with_dasherize_false
-    xml = [
-      { :name => "David", :street_address => "Paulina" }, { :name => "Jason", :street_address => "Evergreen" }
-    ].to_xml(:skip_instruct => true, :skip_types => true, :indent => 0, :dasherize => false)
-
-    assert_equal "<objects><object>", xml.first(17)
-    assert xml.include?(%(<street_address>Paulina</street_address>))
-    assert xml.include?(%(<street_address>Evergreen</street_address>))
-  end
-
-  def test_to_xml_with_dasherize_true
-    xml = [
-      { :name => "David", :street_address => "Paulina" }, { :name => "Jason", :street_address => "Evergreen" }
-    ].to_xml(:skip_instruct => true, :skip_types => true, :indent => 0, :dasherize => true)
-
-    assert_equal "<objects><object>", xml.first(17)
-    assert xml.include?(%(<street-address>Paulina</street-address>))
-    assert xml.include?(%(<street-address>Evergreen</street-address>))
-  end
-
-  def test_to_xml_with_instruct
-    xml = [
-      { :name => "David", :age => 26, :age_in_millis => 820497600000 },
-      { :name => "Jason", :age => 31, :age_in_millis => BigDecimal.new('1.0') }
-    ].to_xml(:skip_instruct => false, :indent => 0)
-
-    assert_match(/^<\?xml [^>]*/, xml)
-    assert_equal 0, xml.rindex(/<\?xml /)
-  end
-
-  def test_to_xml_with_block
-    xml = [
-      { :name => "David", :age => 26, :age_in_millis => 820497600000 },
-      { :name => "Jason", :age => 31, :age_in_millis => BigDecimal.new('1.0') }
-    ].to_xml(:skip_instruct => true, :indent => 0) do |builder|
-      builder.count 2
-    end
-
-    assert xml.include?(%(<count>2</count>)), xml
-  end
-
-  def test_to_xml_with_empty
-    xml = [].to_xml
-    assert_match(/type="array"\/>/, xml)
-  end
-
-  def test_to_xml_dups_options
-    options = {:skip_instruct => true}
-    [].to_xml(options)
-    # :builder, etc, shouldn't be added to options
-    assert_equal({:skip_instruct => true}, options)
-  end
-end
-
-class ArrayExtractOptionsTests < ActiveSupport::TestCase
-  class HashSubclass < Hash
-  end
-
-  class ExtractableHashSubclass < Hash
-    def extractable_options?
-      true
-    end
-  end
-
-  def test_extract_options
-    assert_equal({}, [].extract_options!)
-    assert_equal({}, [1].extract_options!)
-    assert_equal({:a=>:b}, [{:a=>:b}].extract_options!)
-    assert_equal({:a=>:b}, [1, {:a=>:b}].extract_options!)
-  end
-
-  def test_extract_options_doesnt_extract_hash_subclasses
-    hash = HashSubclass.new
-    hash[:foo] = 1
-    array = [hash]
-    options = array.extract_options!
-    assert_equal({}, options)
-    assert_equal [hash], array
-  end
-
-  def test_extract_options_extracts_extractable_subclass
-    hash = ExtractableHashSubclass.new
-    hash[:foo] = 1
-    array = [hash]
-    options = array.extract_options!
-    assert_equal({:foo => 1}, options)
-    assert_equal [], array
-  end
-
-  def test_extract_options_extracts_hwia
-    hash = [{:foo => 1}.with_indifferent_access]
-    options = hash.extract_options!
-    assert_equal 1, options[:foo]
-  end
-end
-
-class ArrayWrapperTests < ActiveSupport::TestCase
-  class FakeCollection
-    def to_ary
-      ["foo", "bar"]
-    end
-  end
-
-  class Proxy
-    def initialize(target) @target = target end
-    def method_missing(*a) @target.send(*a) end
-  end
-
-  class DoubtfulToAry
-    def to_ary
-      :not_an_array
-    end
-  end
-
-  class NilToAry
-    def to_ary
-      nil
-    end
-  end
-
-  def test_array
-    ary = %w(foo bar)
-    assert_same ary, Array.wrap(ary)
-  end
-
-  def test_nil
-    assert_equal [], Array.wrap(nil)
-  end
-
-  def test_object
-    o = Object.new
-    assert_equal [o], Array.wrap(o)
-  end
-
-  def test_string
-    assert_equal ["foo"], Array.wrap("foo")
-  end
-
-  def test_string_with_newline
-    assert_equal ["foo\nbar"], Array.wrap("foo\nbar")
-  end
-
-  def test_object_with_to_ary
-    assert_equal ["foo", "bar"], Array.wrap(FakeCollection.new)
-  end
-
-  def test_proxy_object
-    p = Proxy.new(Object.new)
-    assert_equal [p], Array.wrap(p)
-  end
-
-  def test_proxy_to_object_with_to_ary
-    p = Proxy.new(FakeCollection.new)
-    assert_equal [p], Array.wrap(p)
-  end
-
-  def test_struct
-    o = Struct.new(:foo).new(123)
-    assert_equal [o], Array.wrap(o)
-  end
-
-  def test_wrap_returns_wrapped_if_to_ary_returns_nil
-    o = NilToAry.new
-    assert_equal [o], Array.wrap(o)
-  end
-
-  def test_wrap_does_not_complain_if_to_ary_does_not_return_an_array
-    assert_equal DoubtfulToAry.new.to_ary, Array.wrap(DoubtfulToAry.new)
-  end
-end
-
-class ArrayPrependAppendTest < ActiveSupport::TestCase
-  def test_append
-    assert_equal [1, 2], [1].append(2)
-  end
-
-  def test_prepend
-    assert_equal [2, 1], [1].prepend(2)
-  end
-end