1 files changed, 25 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/test_case.rb b/activesupport/lib/active_support/test_case.rb
index 707544e594..a7d9c84387 100644
--- a/activesupport/lib/active_support/test_case.rb
+++ b/activesupport/lib/active_support/test_case.rb
@@ -1,4 +1,4 @@
-require 'test/unit/testcase'
+require 'minitest/spec'
 require 'active_support/testing/setup_and_teardown'
 require 'active_support/testing/assertions'
 require 'active_support/testing/deprecation'
@@ -9,7 +9,13 @@ require 'active_support/testing/mochaing'
 require 'active_support/core_ext/kernel/reporting'
 
 module ActiveSupport
-  class TestCase < ::Test::Unit::TestCase
+  class TestCase < ::MiniTest::Spec
+
+    # Use AS::TestCase for the base class when describing a model
+    register_spec_type(self) do |desc|
+      desc < ActiveRecord::Model
+    end
+
     Assertion = MiniTest::Assertion
     alias_method :method_name, :name if method_defined? :name
     alias_method :method_name, :__name__ if method_defined? :__name__
@@ -19,10 +25,27 @@ module ActiveSupport
       yield if $tags[tag]
     end
 
+    # FIXME: we have tests that depend on run order, we should fix that and
+    # remove this method.
+    def self.test_order # :nodoc:
+      :sorted
+    end
+
     include ActiveSupport::Testing::SetupAndTeardown
     include ActiveSupport::Testing::Assertions
     include ActiveSupport::Testing::Deprecation
     include ActiveSupport::Testing::Pending
     extend ActiveSupport::Testing::Declarative
+
+    # test/unit backwards compatibility methods
+    alias :assert_raise :assert_raises
+    alias :assert_not_nil :refute_nil
+    alias :assert_not_equal :refute_equal
+    alias :assert_no_match :refute_match
+    alias :assert_not_same :refute_same
+
+    def assert_nothing_raised(*args)
+      yield
+    end
   end
 end