internal wiki code, require header line to start with markup

(to allow something like  "one=two"  as text)
+ incl. test case

source/net/yacy/data/wiki/WikiCode.java

@@ -937,7 +937,17 @@ public class WikiCode extends AbstractWikiParser implements WikiParser {
 
             //extra treatment for headlines
             if (Arrays.binarySearch(HEADLINE_TAGS, tags.openWiki) >= 0) {
-                processHeadline(stringBuilder, firstPosition, tags, secondPosition, direlem);
+                // require line starts with headline markup (hdr e.g.  "   == Title == " but not  "Seven = six plus one" )
+                int i = 0;
+                boolean beginsWith = true;
+                while (i < firstPosition) {
+                    if (stringBuilder.charAt(i) > ' ') {
+                        beginsWith = false;
+                        break;
+                    }
+                    i++;
+                }
+                if (beginsWith) processHeadline(stringBuilder, firstPosition, tags, secondPosition, direlem);
             } else {
                 final int oldLength = stringBuilder.length();
                 stringBuilder.replace(firstPosition, firstPosition + tags.openWikiLength, tags.openHTML);

test/java/net/yacy/data/wiki/WikiCodeTest.java

@@ -1,5 +1,6 @@
 package net.yacy.data.wiki;
 
+import java.io.BufferedReader;
 import org.junit.Test;
 import static org.junit.Assert.*;
 
@@ -32,4 +33,26 @@ public class WikiCodeTest {
         }
     }
 
-}
+    /**
+     * test header wiki markup
+     */
+    @Test
+    public void testProcessLineOfWikiCode() {
+        String[] hdrTeststr = new String[]{ // ok test header
+            "== Header ==", "==Header=="};
+
+        String[] nohdrTeststr = new String[]{ // wrong test header
+            "Text of = Header =", "One=Two"};
+
+        WikiCode wc = new WikiCode();
+
+        for (String s : hdrTeststr) { // test ok header
+            String erg = wc.transform("8090", s);
+            assertTrue("<h2> tag expected:"+erg, erg.contains("<h2>"));
+        }
+        for (String s : nohdrTeststr) { // test wrong header
+            String erg = wc.transform("8090", s);
+            assertFalse("no header tag expected:"+erg, erg.contains("<h1>"));
+        }
+    }
+}