diff --git a/src/test/java/org/codelibs/fess/util/DocMapTest.java b/src/test/java/org/codelibs/fess/util/DocMapTest.java
new file mode 100644
index 000000000..0bdb02e3c
--- /dev/null
+++ b/src/test/java/org/codelibs/fess/util/DocMapTest.java
@@ -0,0 +1,48 @@
+/*
+ * 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.util;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.List;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.Iterator;
+
+import org.codelibs.fess.unit.UnitFessTestCase;
+
+public class DocMapTest extends UnitFessTestCase {
+    public void test_DocList() {
+        Map<String, Object> value = new LinkedHashMap<>();
+        DocMap docMap = new DocMap(value);
+        assertTrue(docMap.isEmpty());
+        value.clear();
+
+        List<String> keys = Arrays.asList("test_2", "test_0", "lang", "test_1");
+        value.put(keys.get(0), true);
+        value.put(keys.get(1), 1000);
+        value.put(keys.get(2), "ja");
+        value.put(keys.get(3), "str");
+        docMap = new DocMap(value);
+        assertFalse(docMap.isEmpty());
+
+        Set<Map.Entry<String, Object>> actual = docMap.entrySet();
+        assertTrue(actual.size() == keys.size());
+        docMap.clear();
+
+        assertTrue(docMap.isEmpty());
+    }
+}