diff --git a/src/test/java/org/codelibs/fess/ds/AbstractDataStoreTest.java b/src/test/java/org/codelibs/fess/ds/AbstractDataStoreTest.java
new file mode 100644
index 000000000..ce7b70d15
--- /dev/null
+++ b/src/test/java/org/codelibs/fess/ds/AbstractDataStoreTest.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2012-2018 CodeLibs Project and the Others.
+ *
+ * Licensed 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.
+ */
+package org.codelibs.fess.ds;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.codelibs.fess.ds.callback.IndexUpdateCallback;
+import org.codelibs.fess.es.config.exentity.DataConfig;
+import org.codelibs.fess.unit.UnitFessTestCase;
+
+public class AbstractDataStoreTest extends UnitFessTestCase {
+    public AbstractDataStore dataStore;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        dataStore = new AbstractDataStore() {
+            @Override
+            protected String getName() {
+                return "Test";
+            }
+
+            @Override
+            protected void storeData(DataConfig dataConfig, IndexUpdateCallback callback, Map<String, String> paramMap,
+                    Map<String, String> scriptMap, Map<String, Object> defaultDataMap) {
+                // TODO nothing
+            }
+        };
+    }
+
+    public void test_convertValue() {
+        String value;
+        final Map<String, Object> paramMap = new HashMap<>();
+        paramMap.put("param1", "PARAM1");
+        paramMap.put("param2", "PARAM2+");
+        paramMap.put("param3", "PARAM3*");
+
+        value = "\"abc\"";
+        assertEquals("abc", dataStore.convertValue(value, paramMap));
+
+        value = "param1";
+        assertEquals("PARAM1", dataStore.convertValue(value, paramMap));
+
+        value = "param2";
+        assertEquals("PARAM2+", dataStore.convertValue(value, paramMap));
+
+        value = "\"123\"+param2+\",\"+param3+\"abc\"";
+        assertEquals("123PARAM2+,PARAM3*abc", dataStore.convertValue(value, paramMap));
+
+        value = null;
+        assertEquals("", dataStore.convertValue(value, paramMap));
+
+        value = "";
+        assertEquals("", dataStore.convertValue(value, paramMap));
+
+        value = " ";
+        assertNull(dataStore.convertValue(value, paramMap));
+    }
+}