--- /dev/null	2018-09-04 13:41:48.000000000 +0800
+++ new/test/jdk/com/sun/jndi/dns/FedTests/ListFedBase.java	2018-09-04 13:41:47.000000000 +0800
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import javax.naming.Binding;
+import javax.naming.NamingEnumeration;
+import javax.naming.NamingException;
+
+/**
+ * Abstract test base for Fed list related test, this class extends DNSTestBase.
+ *
+ * @see DNSTestBase
+ * @see TestBase
+ */
+abstract class ListFedBase extends DNSTestBase {
+    private String key;
+
+    public ListFedBase() {
+        // set default test data
+        setKey("host1");
+    }
+
+    /**
+     * Verify given NamingEnumeration match expected count.
+     *
+     * @param enumObj       given NamingEnumeration instance
+     * @param expectedCount given expected count
+     * @throws NamingException
+     */
+    public void verifyNamingEnumeration(NamingEnumeration enumObj,
+            int expectedCount) throws NamingException {
+        DNSTestUtils.debug("Enum is: " + enumObj);
+
+        int count = 0;
+        Binding res;
+
+        while (enumObj.hasMore()) {
+            res = (Binding) enumObj.next();
+            DNSTestUtils.debug(res);
+            ++count;
+        }
+
+        if (count != expectedCount) {
+            throw new RuntimeException(
+                    "Expecting " + expectedCount + " entries but got " + count);
+        }
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+}