Make all of tests runnable on their own.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2691 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/test/base_test.rb

+require 'abstract_unit'
+require 'fixtures/topic'
 require 'fixtures/reply'
 require 'fixtures/company'
 require 'fixtures/developer'

activerecord/test/class_inheritable_attributes_test.rb

-$:.unshift(File.dirname(__FILE__) + '/../lib')
-
 require 'test/unit'
+require 'abstract_unit'
 require 'active_support/class_inheritable_attributes'
 
 class A
@@ -30,4 +29,4 @@ def test_second_level
     assert_equal [ :one, :two, :four ], D.read_inheritable_attribute("first")
     assert_equal [ :one, :two ], B.read_inheritable_attribute("first")
   end
-end
\ No newline at end of file
+end