modify for ruby-1.9.2

.gitignore

@@ -31,3 +31,4 @@ doc/
 
 # other
 *.lock
+.rbx

Manifest.txt

@@ -8,6 +8,7 @@ test-declare.gemspec
 lib/test/declare.rb
 lib/test/declare/requirements.rb
 lib/test/declare/version.rb
+lib/test/declare/compatible_ruby_version.rb
 lib/test/declare/exceptions.rb
 lib/test/declare/assertions.rb
 lib/test/declare/singleton_class.rb

lib/test/declare/assertions.rb

@@ -5,7 +5,8 @@ module Test; module Declare
 
   module Assertions
 
-    UNASSIGNED = Test::Unit::TestCase::UNASSIGNED
+    UNASSIGNED = Test::Unit::TestCase.const_defined?(:UNASSIGNED) ?
+                 Test::Unit::TestCase::UNASSIGNED : ''
 
     def is(other, desc=nil)
       target = it

lib/test/declare/compatible_ruby_version.rb

@@ -0,0 +1,20 @@
+require 'test/unit'
+
+unless RUBY_VERSION >= '1.9.3'
+
+  module MiniTest; class Unit; class TestCase
+
+    class << self
+
+      remove_method :test_suites
+
+      # This code from 1.9.3's minitest
+      def test_suites # :nodoc:
+        @@test_suites.keys.sort_by { |ts| ts.name.to_s }
+      end
+
+    end
+
+  end; end; end
+
+end

lib/test/declare/requirements.rb

@@ -1,4 +1,5 @@
 require_relative 'version'
+require_relative 'compatible_ruby_version'
 require_relative 'exceptions'
 require_relative 'assertions'
 require_relative 'singleton_class'