Added one more testcase to multiple element xml matcher

Author: HaoWang420

Diff for: hamcrest/src/test/java/org/hamcrest/xml/HasXPathTest.java

@@ -92,6 +92,21 @@ public Iterator<String> getPrefixes(String namespaceURI) {
         assertMatches(hasXPath("/books/book/isbn", equalTo("A-ISBN")), multipleBookXml);
     }
 
+    /*
+    Test whether the single element case still works or not
+     */
+    @Test public void
+    appliesMatcherToPathInDocumentWithSingleElement() {
+        Document multipleBookXml = parse("<books>\n"
+                + "<book>\n"
+                + "<isbn>A-ISBN</isbn>\n"
+                + "</book>\n"
+                + "</books>\n"
+        );
+
+        assertMatches(hasXPath("/books/book/isbn", equalTo("A-ISBN")), multipleBookXml);
+    }
+
     @Test public void
     matchesEmptyElement() {
         assertMatches(hasXPath("//emptySomething"), xml);