diff --git a/test/low_test.cpp b/test/low_test.cpp
new file mode 100644
index 0000000..bfca6ec
--- /dev/null
+++ b/test/low_test.cpp
@@ -0,0 +1,24 @@
+#define MCL_USE_LLVM
+#include <cybozu/test.hpp>
+#include <cybozu/xorshift.hpp>
+#include "../src/fp_proto.hpp"
+#include "../src/low_gmp.hpp"
+
+cybozu::XorShift rg;
+
+CYBOZU_TEST_AUTO(addNC)
+{
+	using namespace mcl::fp;
+	const size_t N = 256 / UnitBitSize;
+	Unit x[N], y[N];
+	for (int i = 0; i < 10; i++) {
+		Unit z[N];
+		Unit w[N];
+		rg.read(x, N);
+		rg.read(y, N);
+		low_add<N>(z, x, y);
+		mcl_fp_addNC256(w, x, y);
+		CYBOZU_TEST_EQUAL_ARRAY(z, w, N);
+	}
+}
+