Script: Added test for `OP_1NEGATE` -> `-1` for ASM

test/script/script.js

@@ -216,6 +216,11 @@ describe('Script', function() {
       script.toASM().should.equal('0 3045022100beb1d83771c04faaeb40bded4f031ed0e0730aaab77cf70102ecd05734a1762002206f168fb00f3b9d7c04b8c78e1fc11e81b9caa49885a904bf22780a7e14a8373101 3045022100a319839e37828bf164ff45de34a3fe22d542ebc8297c5d87dbc56fc3068ff9d5022077081a877b6e7f104d8a2fe0985bf2eb7de2e08edbac9499fc3710a353f6546101 522103a70ae7bde64333461fb88aaafe12ad6c67ca17c8213642469ae191e0aabc7251210344a62338c8ddf138771516d38187146242db50853aa588bcb10a5e49c86421a52102b52a1aed304c4d6cedcf82911f90ca6e1ffed0a5b8f7f19c68213d6fcbde677e53ae');
     });
 
+    it('should OP_1NEGATE opcode as -1 with ASM', function() {
+      var script = Script.fromString('OP_1NEGATE');
+      script.toASM().should.equal('-1');
+    });
+
   });
 
   describe('toHex', function() {