Make EncodingTester usable in testing parsed state

This change updates EncodingTester to make it test the result for cases
when the expected character encoding is not limited to what can be
determined by checking only the first 1024 bytes of the input stream.

Otherwise, without this change, EncodingTester is limited to only being
useful for testing the output of the meta prescan.

test-src/nu/validator/htmlparser/test/EncodingTester.java

@@ -36,6 +36,8 @@
 
 public class EncodingTester {
 
+    protected static int SNIFFING_LIMIT = 16384;
+
     private final InputStream aggregateStream;
 
     private final StringBuilder builder = new StringBuilder();
@@ -59,7 +61,7 @@ private boolean runTest() throws IOException, SAXException {
         }
         UntilHashInputStream stream = new UntilHashInputStream(aggregateStream);
         HtmlInputStreamReader reader = new HtmlInputStreamReader(stream, null,
-                null, null, Heuristics.NONE);
+                null, null, Heuristics.NONE, SNIFFING_LIMIT);
         Charset charset = reader.getCharset();
         stream.close();
         if (skipLabel()) {