* numeric.c (int_pow): fix previous nubu's commit.

* test/ruby/test_fixnum.rb: new test.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_fixnum.rb

@@ -0,0 +1,26 @@
+require 'test/unit'
+
+class TestFixnum < Test::Unit::TestCase
+  def setup
+    @verbose = $VERBOSE
+    $VERBOSE = nil
+  end
+
+  def teardown
+    $VERBOSE = @verbose
+  end
+
+  def test_pow
+    [1, 2, 2**64, 2**63*3, 2**64*3].each do |y|
+      [1, 3].each do |x|
+        z1 = x**y
+        z2 = (-x)**y
+        if y % 2 == 1
+          assert_equal(z2, -z1)
+        else
+          assert_equal(z2, z1)
+        end
+      end
+    end
+  end
+end