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diff --git a/activemodel/test/cases/validations/length_validation_test.rb b/activemodel/test/cases/validations/length_validation_test.rb
new file mode 100644
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+++ b/activemodel/test/cases/validations/length_validation_test.rb
@@ -0,0 +1,449 @@
+# encoding: utf-8
+require 'cases/helper'
+require 'cases/tests_database'
+
+require 'models/topic'
+require 'models/developer'
+require 'models/person'
+
+class LengthValidationTest < ActiveModel::TestCase
+  include ActiveModel::TestsDatabase
+  include ActiveModel::ValidationsRepairHelper
+
+  repair_validations(Topic)
+
+  def test_validates_length_of_with_allow_nil
+    Topic.validates_length_of( :title, :is => 5, :allow_nil=>true )
+
+    assert !Topic.create("title" => "ab").valid?
+    assert !Topic.create("title" => "").valid?
+    assert Topic.create("title" => nil).valid?
+    assert Topic.create("title" => "abcde").valid?
+  end
+
+  def test_validates_length_of_with_allow_blank
+    Topic.validates_length_of( :title, :is => 5, :allow_blank=>true )
+
+    assert !Topic.create("title" => "ab").valid?
+    assert Topic.create("title" => "").valid?
+    assert Topic.create("title" => nil).valid?
+    assert Topic.create("title" => "abcde").valid?
+  end
+
+  def test_validates_length_of_using_minimum
+    Topic.validates_length_of :title, :minimum => 5
+
+    t = Topic.create("title" => "valid", "content" => "whatever")
+    assert t.valid?
+
+    t.title = "not"
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["is too short (minimum is 5 characters)"], t.errors[:title]
+
+    t.title = ""
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["is too short (minimum is 5 characters)"], t.errors[:title]
+
+    t.title = nil
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["is too short (minimum is 5 characters)"], t.errors["title"]
+  end
+
+  def test_optionally_validates_length_of_using_minimum
+    Topic.validates_length_of :title, :minimum => 5, :allow_nil => true
+
+    t = Topic.create("title" => "valid", "content" => "whatever")
+    assert t.valid?
+
+    t.title = nil
+    assert t.valid?
+  end
+
+  def test_validates_length_of_using_maximum
+    Topic.validates_length_of :title, :maximum => 5
+
+    t = Topic.create("title" => "valid", "content" => "whatever")
+    assert t.valid?
+
+    t.title = "notvalid"
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["is too long (maximum is 5 characters)"], t.errors[:title]
+
+    t.title = ""
+    assert t.valid?
+
+    t.title = nil
+    assert !t.valid?
+  end
+
+  def test_optionally_validates_length_of_using_maximum
+    Topic.validates_length_of :title, :maximum => 5, :allow_nil => true
+
+    t = Topic.create("title" => "valid", "content" => "whatever")
+    assert t.valid?
+
+    t.title = nil
+    assert t.valid?
+  end
+
+  def test_validates_length_of_using_within
+    Topic.validates_length_of(:title, :content, :within => 3..5)
+
+    t = Topic.new("title" => "a!", "content" => "I'm ooooooooh so very long")
+    assert !t.valid?
+    assert_equal ["is too short (minimum is 3 characters)"], t.errors[:title]
+    assert_equal ["is too long (maximum is 5 characters)"], t.errors[:content]
+
+    t.title = nil
+    t.content = nil
+    assert !t.valid?
+    assert_equal ["is too short (minimum is 3 characters)"], t.errors[:title]
+    assert_equal ["is too short (minimum is 3 characters)"], t.errors[:content]
+
+    t.title = "abe"
+    t.content  = "mad"
+    assert t.valid?
+  end
+
+  def test_optionally_validates_length_of_using_within
+    Topic.validates_length_of :title, :content, :within => 3..5, :allow_nil => true
+
+    t = Topic.create('title' => 'abc', 'content' => 'abcd')
+    assert t.valid?
+
+    t.title = nil
+    assert t.valid?
+  end
+
+  def test_optionally_validates_length_of_using_within_on_create
+    Topic.validates_length_of :title, :content, :within => 5..10, :on => :create, :too_long => "my string is too long: {{count}}"
+
+    t = Topic.create("title" => "thisisnotvalid", "content" => "whatever")
+    assert !t.save
+    assert t.errors[:title].any?
+    assert_equal ["my string is too long: 10"], t.errors[:title]
+
+    t.title = "butthisis"
+    assert t.save
+
+    t.title = "few"
+    assert t.save
+
+    t.content = "andthisislong"
+    assert t.save
+
+    t.content = t.title = "iamfine"
+    assert t.save
+  end
+
+  def test_optionally_validates_length_of_using_within_on_update
+    Topic.validates_length_of :title, :content, :within => 5..10, :on => :update, :too_short => "my string is too short: {{count}}"
+
+    t = Topic.create("title" => "vali", "content" => "whatever")
+    assert !t.save
+    assert t.errors[:title].any?
+
+    t.title = "not"
+    assert !t.save
+    assert t.errors[:title].any?
+    assert_equal ["my string is too short: 5"], t.errors[:title]
+
+    t.title = "valid"
+    t.content = "andthisistoolong"
+    assert !t.save
+    assert t.errors[:content].any?
+
+    t.content = "iamfine"
+    assert t.save
+  end
+
+  def test_validates_length_of_using_is
+    Topic.validates_length_of :title, :is => 5
+
+    t = Topic.create("title" => "valid", "content" => "whatever")
+    assert t.valid?
+
+    t.title = "notvalid"
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["is the wrong length (should be 5 characters)"], t.errors[:title]
+
+    t.title = ""
+    assert !t.valid?
+
+    t.title = nil
+    assert !t.valid?
+  end
+
+  def test_optionally_validates_length_of_using_is
+    Topic.validates_length_of :title, :is => 5, :allow_nil => true
+
+    t = Topic.create("title" => "valid", "content" => "whatever")
+    assert t.valid?
+
+    t.title = nil
+    assert t.valid?
+  end
+
+  def test_validates_length_of_using_bignum
+    bigmin = 2 ** 30
+    bigmax = 2 ** 32
+    bigrange = bigmin...bigmax
+    assert_nothing_raised do
+      Topic.validates_length_of :title, :is => bigmin + 5
+      Topic.validates_length_of :title, :within => bigrange
+      Topic.validates_length_of :title, :in => bigrange
+      Topic.validates_length_of :title, :minimum => bigmin
+      Topic.validates_length_of :title, :maximum => bigmax
+    end
+  end
+
+  def test_validates_length_of_nasty_params
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :minimum=>6, :maximum=>9) }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :within=>6, :maximum=>9) }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :within=>6, :minimum=>9) }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :within=>6, :is=>9) }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :minimum=>"a") }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :maximum=>"a") }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :within=>"a") }
+    assert_raise(ArgumentError) { Topic.validates_length_of(:title, :is=>"a") }
+  end
+
+  def test_validates_length_of_custom_errors_for_minimum_with_message
+    Topic.validates_length_of( :title, :minimum=>5, :message=>"boo {{count}}" )
+    t = Topic.create("title" => "uhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["boo 5"], t.errors[:title]
+  end
+
+  def test_validates_length_of_custom_errors_for_minimum_with_too_short
+    Topic.validates_length_of( :title, :minimum=>5, :too_short=>"hoo {{count}}" )
+    t = Topic.create("title" => "uhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["hoo 5"], t.errors[:title]
+  end
+
+  def test_validates_length_of_custom_errors_for_maximum_with_message
+    Topic.validates_length_of( :title, :maximum=>5, :message=>"boo {{count}}" )
+    t = Topic.create("title" => "uhohuhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["boo 5"], t.errors[:title]
+  end
+
+  def test_validates_length_of_custom_errors_for_in
+    Topic.validates_length_of(:title, :in => 10..20, :message => "hoo {{count}}")
+    t = Topic.create("title" => "uhohuhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["hoo 10"], t.errors["title"]
+
+    t = Topic.create("title" => "uhohuhohuhohuhohuhohuhohuhohuhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["hoo 20"], t.errors["title"]
+  end
+
+  def test_validates_length_of_custom_errors_for_maximum_with_too_long
+    Topic.validates_length_of( :title, :maximum=>5, :too_long=>"hoo {{count}}" )
+    t = Topic.create("title" => "uhohuhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["hoo 5"], t.errors["title"]
+  end
+
+  def test_validates_length_of_custom_errors_for_is_with_message
+    Topic.validates_length_of( :title, :is=>5, :message=>"boo {{count}}" )
+    t = Topic.create("title" => "uhohuhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["boo 5"], t.errors["title"]
+  end
+
+  def test_validates_length_of_custom_errors_for_is_with_wrong_length
+    Topic.validates_length_of( :title, :is=>5, :wrong_length=>"hoo {{count}}" )
+    t = Topic.create("title" => "uhohuhoh", "content" => "whatever")
+    assert !t.valid?
+    assert t.errors[:title].any?
+    assert_equal ["hoo 5"], t.errors["title"]
+  end
+
+  def test_validates_length_of_using_minimum_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of :title, :minimum => 5
+
+      t = Topic.create("title" => "一二三四五", "content" => "whatever")
+      assert t.valid?
+
+      t.title = "一二三四"
+      assert !t.valid?
+      assert t.errors[:title].any?
+      assert_equal ["is too short (minimum is 5 characters)"], t.errors["title"]
+    end
+  end
+
+  def test_validates_length_of_using_maximum_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of :title, :maximum => 5
+
+      t = Topic.create("title" => "一二三四五", "content" => "whatever")
+      assert t.valid?
+
+      t.title = "一二34五六"
+      assert !t.valid?
+      assert t.errors[:title].any?
+      assert_equal ["is too long (maximum is 5 characters)"], t.errors["title"]
+    end
+  end
+
+  def test_validates_length_of_using_within_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of(:title, :content, :within => 3..5)
+
+      t = Topic.new("title" => "一二", "content" => "12三四五六七")
+      assert !t.valid?
+      assert_equal ["is too short (minimum is 3 characters)"], t.errors[:title]
+      assert_equal ["is too long (maximum is 5 characters)"], t.errors[:content]
+      t.title = "一二三"
+      t.content  = "12三"
+      assert t.valid?
+    end
+  end
+
+  def test_optionally_validates_length_of_using_within_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of :title, :within => 3..5, :allow_nil => true
+
+      t = Topic.create(:title => "一二三四五")
+      assert t.valid?, t.errors.inspect
+
+      t = Topic.create(:title => "一二三")
+      assert t.valid?, t.errors.inspect
+
+      t.title = nil
+      assert t.valid?, t.errors.inspect
+    end
+  end
+
+  def test_optionally_validates_length_of_using_within_on_create_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of :title, :within => 5..10, :on => :create, :too_long => "長すぎます: {{count}}"
+
+      t = Topic.create("title" => "一二三四五六七八九十A", "content" => "whatever")
+      assert !t.save
+      assert t.errors[:title].any?
+      assert_equal "長すぎます: 10", t.errors[:title].first
+
+      t.title = "一二三四五六七八九"
+      assert t.save
+
+      t.title = "一二3"
+      assert t.save
+
+      t.content = "一二三四五六七八九十"
+      assert t.save
+
+      t.content = t.title = "一二三四五六"
+      assert t.save
+    end
+  end
+
+  def test_optionally_validates_length_of_using_within_on_update_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of :title, :within => 5..10, :on => :update, :too_short => "短すぎます: {{count}}"
+
+      t = Topic.create("title" => "一二三4", "content" => "whatever")
+      assert !t.save
+      assert t.errors[:title].any?
+
+      t.title = "1二三4"
+      assert !t.save
+      assert t.errors[:title].any?
+      assert_equal ["短すぎます: 5"], t.errors[:title]
+
+      t.title = "一二三四五六七八九十A"
+      assert !t.save
+      assert t.errors[:title].any?
+
+      t.title = "一二345"
+      assert t.save
+    end
+  end
+
+  def test_validates_length_of_using_is_utf8
+    with_kcode('UTF8') do
+      Topic.validates_length_of :title, :is => 5
+
+      t = Topic.create("title" => "一二345", "content" => "whatever")
+      assert t.valid?
+
+      t.title = "一二345六"
+      assert !t.valid?
+      assert t.errors[:title].any?
+      assert_equal ["is the wrong length (should be 5 characters)"], t.errors["title"]
+    end
+  end
+
+  def test_validates_length_of_with_block
+    Topic.validates_length_of :content, :minimum => 5, :too_short=>"Your essay must be at least {{count}} words.",
+                                        :tokenizer => lambda {|str| str.scan(/\w+/) }
+    t = Topic.create!(:content => "this content should be long enough")
+    assert t.valid?
+
+    t.content = "not long enough"
+    assert !t.valid?
+    assert t.errors[:content].any?
+    assert_equal ["Your essay must be at least 5 words."], t.errors[:content]
+  end
+
+  def test_validates_length_of_with_custom_too_long_using_quotes
+    repair_validations(Developer) do
+      Developer.validates_length_of :name, :maximum => 4, :too_long=> "This string contains 'single' and \"double\" quotes"
+      d = Developer.new
+      d.name = "Jeffrey"
+      assert !d.valid?
+      assert_equal ["This string contains 'single' and \"double\" quotes"], d.errors[:name]
+    end
+  end
+
+  def test_validates_length_of_with_custom_too_short_using_quotes
+    repair_validations(Developer) do
+      Developer.validates_length_of :name, :minimum => 4, :too_short=> "This string contains 'single' and \"double\" quotes"
+      d = Developer.new
+      d.name = "Joe"
+      assert !d.valid?
+      assert_equal ["This string contains 'single' and \"double\" quotes"], d.errors[:name]
+    end
+  end
+
+  def test_validates_length_of_with_custom_message_using_quotes
+    repair_validations(Developer) do
+      Developer.validates_length_of :name, :minimum => 4, :message=> "This string contains 'single' and \"double\" quotes"
+      d = Developer.new
+      d.name = "Joe"
+      assert !d.valid?
+      assert_equal ["This string contains 'single' and \"double\" quotes"], d.errors[:name]
+    end
+  end
+
+  def test_validates_length_of_for_ruby_class
+    repair_validations(Person) do
+      Person.validates_length_of :karma, :minimum => 5
+
+      p = Person.new
+      p.karma = "Pix"
+      assert p.invalid?
+
+      assert_equal ["is too short (minimum is 5 characters)"], p.errors[:karma]
+
+      p.karma = "The Smiths"
+      assert p.valid?
+    end
+  end
+end