Revert "minitest provides "it" and "describe""

This reverts commit 22bc12ec37.

REASON: We will remove the MiniTest::Spec from Rails and we need these
methods again

Conflicts:
	activesupport/lib/active_support/test_case.rb

activesupport/lib/active_support/test_case.rb

@@ -5,6 +5,7 @@ require 'active_support/testing/setup_and_teardown'
 require 'active_support/testing/assertions'
 require 'active_support/testing/deprecation'
 require 'active_support/testing/pending'
+require 'active_support/testing/declarative'
 require 'active_support/testing/isolation'
 require 'active_support/testing/constant_lookup'
 require 'active_support/core_ext/kernel/reporting'
@@ -42,25 +43,7 @@ module ActiveSupport
     include ActiveSupport::Testing::Assertions
     include ActiveSupport::Testing::Deprecation
     include ActiveSupport::Testing::Pending
-
-    def self.describe(text)
-      if block_given?
-        super
-      else
-        message = "`describe` without a block is deprecated, please switch to: `def self.name; #{text.inspect}; end`\n"
-        ActiveSupport::Deprecation.warn message
-
-        class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
-          def self.name
-            "#{text}"
-          end
-        RUBY_EVAL
-      end
-    end
-
-    class << self
-      alias :test :it
-    end
+    extend ActiveSupport::Testing::Declarative
 
     # test/unit backwards compatibility methods
     alias :assert_raise :assert_raises

activesupport/lib/active_support/testing/declarative.rb

@@ -0,0 +1,40 @@
+module ActiveSupport
+  module Testing
+    module Declarative
+
+      def self.extended(klass) #:nodoc:
+        klass.class_eval do
+
+          unless method_defined?(:describe)
+            def self.describe(text)
+              class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
+                def self.name
+                  "#{text}"
+                end
+              RUBY_EVAL
+            end
+          end
+
+        end
+      end
+
+      unless defined?(Spec)
+        # test "verify something" do
+        #   ...
+        # end
+        def test(name, &block)
+          test_name = "test_#{name.gsub(/\s+/,'_')}".to_sym
+          defined = instance_method(test_name) rescue false
+          raise "#{test_name} is already defined in #{self}" if defined
+          if block_given?
+            define_method(test_name, &block)
+          else
+            define_method(test_name) do
+              flunk "No implementation provided for #{name}"
+            end
+          end
+        end
+      end
+    end
+  end
+end