4 files changed, 5 insertions, 5 deletions
diff --git a/activemodel/test/cases/attribute_methods_test.rb b/activemodel/test/cases/attribute_methods_test.rb
index 5659dcbc48..c60caf90d7 100644
--- a/activemodel/test/cases/attribute_methods_test.rb
+++ b/activemodel/test/cases/attribute_methods_test.rb
@@ -31,7 +31,7 @@ class AttributeMethodsTest < ActiveModel::TestCase
     ModelWithAttributes.define_attribute_methods([:foo])
 
     assert ModelWithAttributes.attribute_methods_generated?
-    assert ModelWithAttributes.new.respond_to?(:foo)
+    assert_respond_to ModelWithAttributes.new, :foo
     assert_equal "value of foo", ModelWithAttributes.new.foo
   end
 
diff --git a/activemodel/test/cases/callbacks_test.rb b/activemodel/test/cases/callbacks_test.rb
index b996f51d6b..9675b5d450 100644
--- a/activemodel/test/cases/callbacks_test.rb
+++ b/activemodel/test/cases/callbacks_test.rb
@@ -65,6 +65,6 @@ class CallbacksTest < ActiveModel::TestCase
   test "only selects which types of callbacks should be created" do
     assert !ModelCallbacks.respond_to?(:before_initialize)
     assert !ModelCallbacks.respond_to?(:around_initialize)
-    assert ModelCallbacks.respond_to?(:after_initialize)
+    assert_respond_to ModelCallbacks, :after_initialize
   end
 end
diff --git a/activemodel/test/cases/dirty_test.rb b/activemodel/test/cases/dirty_test.rb
index c910cb43d4..e1a35be384 100644
--- a/activemodel/test/cases/dirty_test.rb
+++ b/activemodel/test/cases/dirty_test.rb
@@ -22,8 +22,8 @@ class DirtyTest < ActiveModel::TestCase
   test "changes accessible through both strings and symbols" do
     model = DirtyModel.new
     model.name = "David"
-    assert !model.changes[:name].nil?
-    assert !model.changes['name'].nil?
+    assert_not_nil model.changes[:name]
+    assert_not_nil model.changes['name']
   end
 
 end
diff --git a/activemodel/test/cases/serializeration/xml_serialization_test.rb b/activemodel/test/cases/serializeration/xml_serialization_test.rb
index 4e8e4efa25..7b9ef3e21f 100644
--- a/activemodel/test/cases/serializeration/xml_serialization_test.rb
+++ b/activemodel/test/cases/serializeration/xml_serialization_test.rb
@@ -69,7 +69,7 @@ class XmlSerializationTest < ActiveModel::TestCase
 
   test "should allow skipped types" do
     @xml = @contact.to_xml :skip_types => true
-    assert %r{<age>25</age>}.match(@xml)
+    assert_match %r{<age>25</age>}, @xml
   end
 
   test "should include yielded additions" do