--- a/stress-tester/src/main/java/com/passus/st/reader/nc/NcDataHelper.java	Tue Nov 21 09:29:19 2017 +0100
+++ b/stress-tester/src/main/java/com/passus/st/reader/nc/NcDataHelper.java	Tue Nov 21 10:43:31 2017 +0100
@@ -126,7 +126,7 @@
                 throw new IndexOutOfBoundsException();
             }
 
-            data[startIndex] = (byte) bytes;
+            data[startIndex] = (byte) (0x80 | bytes);
             startIndex++;
             DataUtils.putInt(data, startIndex, bytes, value);
             return bytes + 1;
@@ -201,8 +201,8 @@
             if (endIndex - startIndex < bytes + 2) {
                 throw new IndexOutOfBoundsException();
             }
-            data[startIndex++] = (byte) (value >> 8);
-            data[startIndex++] = (byte) value;
+            data[startIndex++] = (byte) 0x80;
+            data[startIndex++] = (byte) bytes;
 
             DataUtils.putLong(data, startIndex, bytes, value);
             return bytes + 2;

--- a/stress-tester/src/test/java/com/passus/st/reader/nc/NcDataHelperTest.java	Tue Nov 21 09:29:19 2017 +0100
+++ b/stress-tester/src/test/java/com/passus/st/reader/nc/NcDataHelperTest.java	Tue Nov 21 10:43:31 2017 +0100
@@ -22,7 +22,7 @@
         return new Object[][]{
             {new byte[]{0x00}, 1, 0x00},
             {new byte[]{0x7F}, 1, 0x7F},
-            {new byte[]{(byte) 0x81, (byte) 0x03}, 2, 0x03}
+            {new byte[]{(byte) 0x81, (byte) 0xFF}, 2, 0xFF}
         };
     }
 
@@ -31,7 +31,7 @@
         return new Object[][]{
             {new byte[]{0x00, 0x00}, 2, 0x00L},
             {new byte[]{0x00, 0x7F}, 2, 0x7FL},
-            {new byte[]{(byte) 0x80, 0x01, 0x03}, 3, 0x03L}
+            {new byte[]{(byte) 0x80, 0x02, (byte) 0x80, 0x01}, 4, 0x8001L}
         };
     }
 
@@ -57,6 +57,13 @@
         assertEquals(expectedLength, length.intValue());
     }
 
+    @Test(dataProvider = "validIntVLC")
+    public void testWriteIntVLC(byte[] expectedResult, int expectedBytes, int length) {
+        byte[] result = new byte[expectedResult.length];
+        helper.writeIntVLC(length, result);
+        assertEquals(expectedResult, result);
+    }
+
     @Test(dataProvider = "validLongVLC")
     public void testReadLongVLC_ByteBuff(byte[] data, int expectedBytes, long expectedLength) {
         ByteBuff buff = new HeapByteBuff();
@@ -79,4 +86,10 @@
         assertEquals(expectedLength, length.longValue());
     }
 
+    @Test(dataProvider = "validLongVLC")
+    public void testWriteLongVLC(byte[] expectedResult, int expectedBytes, long length) {
+        byte[] result = new byte[expectedResult.length];
+        helper.writeLongVLC(length, result);
+        assertEquals(expectedResult, result);
+    }
 }