--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javap/T4876942.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2008, 2016, 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.
+ */
+
+/*
+ * @test
+ * @bug 4876942 6715251
+ * @summary javap invoked without args does not print help screen
+ * @modules jdk.jdeps/com.sun.tools.javap
+ */
+
+import java.io.*;
+import java.util.zip.*;
+
+public class T4876942 {
+    public static void main(String[] args) throws Exception {
+        new T4876942().run();
+    }
+
+    public void run() throws IOException {
+        String output = javap();
+        verify(output, "-public", "-protected", "-private"); // check that some of the options are listed
+
+        if (errors > 0)
+            throw new Error(errors + " found.");
+    }
+
+    String javap(String... args) {
+        StringWriter sw = new StringWriter();
+        PrintWriter out = new PrintWriter(sw);
+        //sun.tools.javap.Main.entry(args);
+        int rc = com.sun.tools.javap.Main.run(args, out);
+        if (rc != (args.length == 0 ? 2 : 0))
+            throw new Error("javap failed. rc=" + rc);
+        out.close();
+        return sw.toString();
+    }
+
+    void verify(String output, String... expects) {
+        for (String expect: expects) {
+            if (output.indexOf(expect)< 0)
+                error(expect + " not found");
+        }
+    }
+
+    void error(String msg) {
+        System.err.println(msg);
+        errors++;
+    }
+
+    int errors;
+}