--- /dev/null	2018-08-07 17:30:56.000000000 +0800
+++ new/test/jdk/com/sun/jndi/dns/FactoryTests/LookupFactoryBase.java	2018-08-07 17:30:56.000000000 +0800
@@ -0,0 +1,116 @@
+/*
+ * 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.Context;
+import javax.naming.NamingException;
+import javax.naming.directory.InitialDirContext;
+
+/**
+ * Abstract test base for Factory related Tests, this class extends DNSTestBase.
+ *
+ * This test base will also been referenced outside of current open test folder,
+ * please double check all usages when modify this.
+ *
+ * @see DNSTestBase
+ * @see TestBase
+ */
+public abstract class LookupFactoryBase extends DNSTestBase {
+    // pre defined attribute value for 'A'
+    public static final String ATTRIBUTE_VALUE = "1.2.4.1";
+
+    private String key;
+
+    public LookupFactoryBase() {
+        // set default test data
+        setKey("host1");
+    }
+
+    /**
+     * Initial context with given object factories and lookup attr.
+     *
+     * @param objFactories given object factories, can be null to ignore
+     * @param lookupAttr   given lookup attr, can be null to ignore
+     * @throws NamingException if a naming exception is encountered
+     */
+    public void initContext(String objFactories, String lookupAttr)
+            throws NamingException {
+        if (objFactories != null) {
+            env().put(Context.OBJECT_FACTORIES, objFactories);
+        }
+        if (lookupAttr != null) {
+            env().put("com.sun.jndi.dns.lookup.attr", lookupAttr);
+        }
+        setContext(new InitialDirContext(env()));
+    }
+
+    /**
+     * Overload method of verifyLookupObject, specify class type TestDnsObject.
+     *
+     * @param obj given lookup returned object
+     */
+    public void verifyLookupObject(Object obj) {
+        verifyLookupObject(obj, TestDnsObject.class);
+    }
+
+    /**
+     * Verify given lookup returned object whether match class type, will throw
+     * RuntimeException if verify failed.
+     *
+     * @param obj       given lookup returned object
+     * @param classType given class type
+     * @param <T>       given type
+     */
+    public <T> void verifyLookupObject(Object obj, Class<T> classType) {
+        DNSTestUtils.debug("Object is: " + obj);
+        if (!classType.isInstance(obj)) {
+            throw new RuntimeException(
+                    "Failed: expecting a " + classType + ", but actual is "
+                            + obj.getClass());
+        }
+    }
+
+    /**
+     * Verify given lookup returned object match class type TestDnsObject, then
+     * verify the object toString() value match with given value, will throw
+     * RuntimeException if any verification step failed.
+     *
+     * @param obj   given lookup returned object
+     * @param value given expected value
+     */
+    public void verifyLookupObjectAndValue(Object obj, String value) {
+        verifyLookupObject(obj);
+        if (!obj.toString().equals(value)) {
+            throw new RuntimeException(
+                    "Unexpected object value: " + obj.toString() + " expected: "
+                            + value);
+        }
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+}