* lib/optparse.rb (OptionParser#order, #permute, #parse): allow an

array as argument.

* test/ruby/test_*.rb: moved invariants to left side in
  assert_equal, and use assert_nil, assert_raises and so on.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4516 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_math.rb

@@ -4,11 +4,11 @@ $KCODE = 'none'
 
 class TestMath < Test::Unit::TestCase
   def test_math
-    assert_equal(Math.sqrt(4), 2)
-    
+    assert_equal(2, Math.sqrt(4))
+
     self.class.class_eval {
       include Math
     }
-    assert_equal(sqrt(4), 2)
+    assert_equal(2, sqrt(4))
   end
 end