Use ActiveModel::TestCase base class

activemodel/lib/active_model/lint.rb

@@ -1,6 +1,3 @@
-require "test/unit"
-require "test/unit/ui/console/testrunner"
-
 # You can test whether an object is compliant with the ActiveModel API by
 # calling ActiveModel::Lint.test(object). It will emit a Test::Unit
 # output that tells you whether your object is fully compliant, or if not,
@@ -16,6 +13,9 @@ require "test/unit/ui/console/testrunner"
 module ActiveModel
   module Lint
     def self.test(object, verbosity = 2, output = STDOUT)
+      require "test/unit"
+      require "test/unit/ui/console/testrunner"
+
       test_class = Class.new(::Test::Unit::TestCase) do
         include Test
 

activemodel/test/cases/lint_test.rb

@@ -1,6 +1,6 @@
 require "cases/helper"
 
-class TestLint < Test::Unit::TestCase
+class TestLint < ActiveModel::TestCase
   class CompliantObject
     def to_model
       self
@@ -47,4 +47,4 @@ class TestLint < Test::Unit::TestCase
   def test_errors_full_messages
     assert_output(CompliantObject.new, 0, 0, /test_errors_aref/)
   end
-end
+end

activemodel/test/cases/naming_test.rb

@@ -1,6 +1,6 @@
 require 'cases/helper'
 
-class NamingTest < Test::Unit::TestCase
+class NamingTest < ActiveModel::TestCase
   def setup
     @model_name = ActiveModel::Name.new('Post::TrackBack')
   end

activemodel/test/cases/validations/i18n_generate_message_validation_test.rb

@@ -3,7 +3,7 @@ require 'cases/tests_database'
 
 require 'models/person'
 
-class I18nGenerateMessageValidationTest < Test::Unit::TestCase
+class I18nGenerateMessageValidationTest < ActiveModel::TestCase
   def setup
     Person.reset_callbacks(:validate)
     @person = Person.new