diff --git a/src/test/java/org/codelibs/fess/helper/AccessTokenHelperTest.java b/src/test/java/org/codelibs/fess/helper/AccessTokenHelperTest.java
new file mode 100644
index 000000000..efbbb2bb9
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+++ b/src/test/java/org/codelibs/fess/helper/AccessTokenHelperTest.java
@@ -0,0 +1,79 @@
+/*
+ * 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.helper;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.codelibs.fess.unit.UnitFessTestCase;
+import org.codelibs.fess.exception.InvalidAccessTokenException;
+import org.codelibs.fess.util.ComponentUtil;
+import org.dbflute.utflute.mocklet.MockletHttpServletRequest;
+
+public class AccessTokenHelperTest extends UnitFessTestCase {
+
+    protected static final int NUM = 20;
+
+    private AccessTokenHelper accessTokenHelper;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        accessTokenHelper = new AccessTokenHelper();
+    }
+
+    public void test_generateAccessToken() {
+        List<String> tokens = new ArrayList<String>();
+        for (int i = 0; i < NUM; i++) {
+            tokens.add(accessTokenHelper.generateAccessToken());
+        }
+        for (int i = 0; i < NUM; i++) {
+            assertFalse(tokens.get(i).isEmpty());
+            for (int j = i + 1; j < NUM; j++) {
+                assertFalse(tokens.get(i).equals(tokens.get(j)));
+            }
+        }
+    }
+
+    public void test_getAccessTokenFromRequest_ok0() {
+        final String token = accessTokenHelper.generateAccessToken();
+        MockletHttpServletRequest req = getMockRequest();
+        req.addHeader("Authorization", "Bearer " + token);
+        assertEquals(token, accessTokenHelper.getAccessTokenFromRequest(req));
+    }
+
+    public void test_getAccessTokenFromRequest_ok1() {
+        final String token = accessTokenHelper.generateAccessToken();
+        MockletHttpServletRequest req = getMockRequest();
+        req.addHeader("Authorization", token);
+        assertEquals(token, accessTokenHelper.getAccessTokenFromRequest(req));
+    }
+
+    public void test_getAccessTokenFromRequest_ng0() {
+        final String token = accessTokenHelper.generateAccessToken();
+        MockletHttpServletRequest req = getMockRequest();
+        assertNull(accessTokenHelper.getAccessTokenFromRequest(req));
+    }
+
+    public void test_getAccessTokenFromRequest_ng1() {
+        final String token = "INVALID _TOKEN0";
+        MockletHttpServletRequest req = getMockRequest();
+        req.addHeader("Authorization", token);
+        assertThrows(InvalidAccessTokenException.class, () -> accessTokenHelper.getAccessTokenFromRequest(req));
+    }
+}