Print out a warning if there are template-markers left over after doing

the replacements, closes #6.

src/main/java/org/dstadler/poi/mailmerge/MailMerge.java

@@ -9,6 +9,7 @@
 import java.util.List;
 import java.util.logging.Logger;
 
+import org.apache.commons.lang3.StringUtils;
 import org.apache.poi.xwpf.usermodel.XWPFDocument;
 import org.apache.xmlbeans.XmlException;
 import org.apache.xmlbeans.XmlOptions;
@@ -105,6 +106,12 @@ private void applyLines(Data dataIn, XWPFDocument doc, String outputFile) throws
 				replaced = replaced.replace("${" + header + "}", value);
 	    	}
 
+			// check for missed replacements or formatting which interferes
+			if(replaced.contains("${")) {
+				log.warning("Still found template-marker after doing replacement: " +
+						StringUtils.abbreviate(StringUtils.substring(replaced, replaced.indexOf("${")), 200));
+			}
+
 			appendBody(body, replaced, first);
 
 			first = false;

src/test/java/org/dstadler/poi/mailmerge/MailMergeTest.java

@@ -100,4 +100,19 @@ public void testInvalidXlsx() throws Exception {
 			// expected here
 		}
 	}
+
+	@Test
+	public void testTagSplitByFormatting() throws Exception {
+		assertTrue("Failed to create directory 'build'", new File("build").exists() || new File("build").mkdirs());
+
+		// ensure the result file is not there
+		assertTrue("File should not exist or we should be able to delete it, exist: " + RESULT_FILE.exists(),
+				!RESULT_FILE.exists() || RESULT_FILE.delete());
+
+		// use sample files to run a full merge
+		MailMerge.main(new String[] {"samples/Template-TagSplitByFormatting.docx", "samples/Lines.xlsx", RESULT_FILE.getPath()});
+
+		// ensure the result file is written now
+		assertTrue(RESULT_FILE.exists());
+	}
 }