1 files changed, 31 insertions, 0 deletions
diff --git a/test/-ext-/bignum/test_pack.rb b/test/-ext-/bignum/test_pack.rb
index ea5dedd585..d34a59db31 100644
--- a/test/-ext-/bignum/test_pack.rb
+++ b/test/-ext-/bignum/test_pack.rb
@@ -162,5 +162,36 @@ class TestBignum < Test::Unit::TestCase
       assert_equal(-0x8070605040302010, Integer.test_unpack("\x80\x70\x60\x50\x40\x30\x20\x10", 8, 1, 0, BIG_ENDIAN|NEGATIVE))
     end
 
+    def test_unpack2comp_single_byte
+      assert_equal(-128, Integer.test_unpack_2comp("\x80", 1, 1, 0, BIG_ENDIAN))
+      assert_equal(  -2, Integer.test_unpack_2comp("\xFE", 1, 1, 0, BIG_ENDIAN))
+      assert_equal(  -1, Integer.test_unpack_2comp("\xFF", 1, 1, 0, BIG_ENDIAN))
+      assert_equal(   0, Integer.test_unpack_2comp("\x00", 1, 1, 0, BIG_ENDIAN))
+      assert_equal(   1, Integer.test_unpack_2comp("\x01", 1, 1, 0, BIG_ENDIAN))
+      assert_equal(   2, Integer.test_unpack_2comp("\x02", 1, 1, 0, BIG_ENDIAN))
+      assert_equal( 127, Integer.test_unpack_2comp("\x7F", 1, 1, 0, BIG_ENDIAN))
+    end
+
+    def test_unpack2comp_sequence_of_ff
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*2, 2, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*3, 3, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*4, 4, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*5, 5, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*6, 6, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*7, 7, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*8, 8, 1, 0, BIG_ENDIAN))
+      assert_equal(-1, Integer.test_unpack_2comp("\xFF"*9, 9, 1, 0, BIG_ENDIAN))
+    end
+
+    def test_unpack2comp_negative_single_byte
+      assert_equal(-256, Integer.test_unpack_2comp("\x00", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+      assert_equal(-255, Integer.test_unpack_2comp("\x01", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+      assert_equal(-254, Integer.test_unpack_2comp("\x02", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+      assert_equal(-129, Integer.test_unpack_2comp("\x7F", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+      assert_equal(-128, Integer.test_unpack_2comp("\x80", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+      assert_equal(  -2, Integer.test_unpack_2comp("\xFE", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+      assert_equal(  -1, Integer.test_unpack_2comp("\xFF", 1, 1, 0, BIG_ENDIAN|NEGATIVE))
+    end
+
   end
 end