diff --git a/spec/test/utilSpec.js b/spec/test/utilSpec.js
--- a/spec/test/utilSpec.js
+++ b/spec/test/utilSpec.js
@@ -14,6 +14,15 @@ describe("Util",function(){
 		["\ud84c\udfb4",[0xf0,0xa3,0x8e,0xb4]]
 	];
 	
+	describe("bytes2int32s",function(){
+		it("should pack bytes into 32b integers",function(){
+			expect(util.bytes2int32s([])).toEqual([]);
+			expect(util.bytes2int32s([0])).toEqual([0]);
+			expect(util.bytes2int32s([1])).toEqual([1]);
+			expect(util.bytes2int32s([0x12,0x34,0x56,0x78,0x9a])).toEqual([0x78563412,0x9a]);
+		});
+	});
+	
 	describe("str2utf8",function(){
 		it("should encode a String into bytes in UTF-8",function(){
 			utf.forEach(couple=>expect(util.str2utf8(couple[0])).toEqual(couple[1]));