1 files changed, 26 insertions, 0 deletions
diff --git a/test/ruby/test_fixnum.rb b/test/ruby/test_fixnum.rb
new file mode 100644
index 0000000000..57999d4b03
--- /dev/null
+++ b/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