diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index d5dbb88886cb9..7372f2da1b6e8 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -186,15 +186,6 @@ def test_succesful_build_association
     assert_equal account, firm.account
   end
 
-  def test_failing_build_association
-    firm = Firm.new("name" => "GlobalMegaCorp")
-    firm.save
-
-    account = firm.build_account
-    assert !account.save
-    assert_equal ["can't be empty"], account.errors["credit_limit"]
-  end
-
   def test_build_association_twice_without_saving_affects_nothing
     count_of_account = Account.count
     firm = Firm.find(:first)
diff --git a/activerecord/test/cases/associations/join_model_test.rb b/activerecord/test/cases/associations/join_model_test.rb
index e9af5a60d8ad2..8bdf8bcd55bf9 100644
--- a/activerecord/test/cases/associations/join_model_test.rb
+++ b/activerecord/test/cases/associations/join_model_test.rb
@@ -52,18 +52,6 @@ def test_has_many_uniq_through_dynamic_find
     assert_equal 1, authors(:mary).unique_categorized_posts.find_all_by_title("So I was thinking").size
   end
 
-  def test_polymorphic_has_many
-    assert posts(:welcome).taggings.include?(taggings(:welcome_general))
-  end
-
-  def test_polymorphic_has_one
-    assert_equal taggings(:welcome_general), posts(:welcome).tagging
-  end
-
-  def test_polymorphic_belongs_to
-    assert_equal posts(:welcome), posts(:welcome).taggings.first.taggable
-  end
-
   def test_polymorphic_has_many_going_through_join_model
     assert_equal tags(:general), tag = posts(:welcome).tags.first
     assert_no_queries do
diff --git a/activerecord/test/cases/reflection_test.rb b/activerecord/test/cases/reflection_test.rb
index 2c9158aa7bf50..67818622d7935 100644
--- a/activerecord/test/cases/reflection_test.rb
+++ b/activerecord/test/cases/reflection_test.rb
@@ -22,12 +22,6 @@ def test_human_name
     assert_equal "Subscriber", Subscriber.model_name.human
   end
 
-  def test_column_null_not_null
-    subscriber = Subscriber.find(:first)
-    assert subscriber.column_for_attribute("name").null
-    assert !subscriber.column_for_attribute("nick").null
-  end
-
   def test_read_attribute_names
     assert_equal(
       %w( id title author_name author_email_address bonus_time written_on last_read content approved replies_count parent_id parent_title type ).sort,
diff --git a/activerecord/test/cases/validations/i18n_validation_test.rb b/activerecord/test/cases/validations/i18n_validation_test.rb
index a0ff35f948e9b..38fa2b821ddc4 100644
--- a/activerecord/test/cases/validations/i18n_validation_test.rb
+++ b/activerecord/test/cases/validations/i18n_validation_test.rb
@@ -47,25 +47,6 @@ def test_validates_uniqueness_of_generates_message_with_custom_default_message
     @topic.valid?
   end
 
-  # validates_uniqueness_of w/o mocha
-
-  def test_validates_associated_finds_custom_model_key_translation
-    I18n.backend.store_translations 'en', :activerecord => {:errors => {:models => {:topic => {:attributes => {:title => {:taken => 'custom message'}}}}}}
-    I18n.backend.store_translations 'en', :activerecord => {:errors => {:messages => {:taken => 'global message'}}}
-
-    Topic.validates_uniqueness_of :title
-    unique_topic.valid?
-    assert_equal ['custom message'], unique_topic.errors[:replies]
-  end
-
-  def test_validates_associated_finds_global_default_translation
-    I18n.backend.store_translations 'en', :activerecord => {:errors => {:messages => {:taken => 'global message'}}}
-
-    Topic.validates_uniqueness_of :title
-    unique_topic.valid?
-    assert_equal ['global message'], unique_topic.errors[:replies]
-  end
-
   # validates_associated w/ mocha
 
   def test_validates_associated_generates_message