Fix off issue codehaus-plexus#22

fixed unit test, so it fails for the old code
* old unit test implementation was trapped by the buffer resizing (for the one, big 10k chars xml comment), so this was tailored into 10 * 1000 chars xml comments

src/test/java/org/codehaus/plexus/util/xml/pull/MXParserTest.java

@@ -194,13 +194,17 @@ public void testSubsequentProcessingInstructionMoreThan8k()
         sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
         sb.append("<project>");
 
-        sb.append("<!-- ");
 
-        for (int i = 0; i < 1000; i++) {
-            sb.append("ten bytes ");
+        // add ten times 1000 chars as comment
+        for (int j = 0; j < 10; j++) {
+
+            sb.append("<!-- ");
+            for (int i = 0; i < 2000; i++) {
+                sb.append("ten bytes ");
+            }
+            sb.append(" -->");
         }
 
-        sb.append(" -->");
         sb.append("<?m2e ignore?>");
         sb.append("</project>");
 
@@ -212,6 +216,15 @@ public void testSubsequentProcessingInstructionMoreThan8k()
         assertEquals( XmlPullParser.PROCESSING_INSTRUCTION, parser.nextToken() );
         assertEquals( XmlPullParser.START_TAG, parser.nextToken() );
         assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
+        assertEquals( XmlPullParser.COMMENT, parser.nextToken() );
         assertEquals( XmlPullParser.PROCESSING_INSTRUCTION, parser.nextToken() );
         assertEquals( XmlPullParser.END_TAG, parser.nextToken() );
     }