Added testcase for prefix getter on JakartaRegexpCapabilities. During LUCENE-2072 dev the prefix method did always return null due to a bug in jakarta-regexp-1.5. This testcase mainly prevents other from simply upgrading as long as this bug has not been fixed.

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@883141 13f79535-47bb-0310-9956-ffa450edef68

contrib/regex/src/test/org/apache/lucene/search/regex/TestJakartaRegexpCapabilities.java

@@ -0,0 +1,37 @@
+package org.apache.lucene.search.regex;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import junit.framework.TestCase;
+
+/**
+ * Testcase for {@link JakartaRegexpCapabilities}
+ */
+public class TestJakartaRegexpCapabilities extends TestCase {
+
+  public void testGetPrefix(){
+    JakartaRegexpCapabilities cap = new JakartaRegexpCapabilities();
+    cap.compile("luc[e]?");
+    assertTrue(cap.match("luce"));
+    assertEquals("luc", cap.prefix());
+    
+    cap.compile("lucene");
+    assertTrue(cap.match("lucene"));
+    assertEquals("lucene", cap.prefix());
+  }
+}