2 files changed, 13 insertions, 0 deletions
diff --git a/test/-ext-/bignum/test_big2str.rb b/test/-ext-/bignum/test_big2str.rb
index 3e45232d6c..f03d2328a1 100644
--- a/test/-ext-/bignum/test_big2str.rb
+++ b/test/-ext-/bignum/test_big2str.rb
@@ -19,5 +19,11 @@ class TestBignum < Test::Unit::TestCase
       assert_equal("1" + "0" * e, x.big2str_poweroftwo(2))
     end
 
+    def test_big2str_gmp
+      x = 10**1000
+      assert_equal("1" + "0" * 1000, x.big2str_gmp(10))
+    rescue NotImplementedError
+    end
+
   end
 end
diff --git a/test/-ext-/bignum/test_mul.rb b/test/-ext-/bignum/test_mul.rb
index e462506e9f..7841dfffb2 100644
--- a/test/-ext-/bignum/test_mul.rb
+++ b/test/-ext-/bignum/test_mul.rb
@@ -126,5 +126,12 @@ class TestBignum < Test::Unit::TestCase
       assert_equal(x.big_mul_normal(y), x.big_mul_toom3(y))
     end
 
+    def test_mul_gmp
+      x = (1 << 2*BITSPERDIG) | (1 << BITSPERDIG) | 1
+      y = (1 << 2*BITSPERDIG) | (1 << BITSPERDIG) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_gmp(y))
+    rescue NotImplementedError
+    end
+
   end
 end