--- /dev/null	2017-05-22 14:23:14.000000000 -0700
+++ new/test/javax/imageio/plugins/gif/EndWriteSequenceTest.java	2017-05-22 14:23:13.000000000 -0700
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2005, 2017, 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 6275366 6275369
+ * @summary Verifies that behaviour of GIFImageWriter.endWriteSequence() is
+ *          consistent with specification
+ */
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriter;
+import javax.imageio.stream.ImageOutputStream;
+
+public class EndWriteSequenceTest {
+    public static void main(String[] args) throws IOException {
+        ImageWriter w =
+            ImageIO.getImageWritersByFormatName("GIF").next();
+
+        boolean gotCorrectException = false;
+
+        /**
+         * check statement: "Throws: IllegalStateException -
+         * if the output has not been set ...."
+         */
+        try {
+            w.reset(); // to be shure that output is null
+            w.endWriteSequence();
+        } catch (IllegalStateException e) {
+            gotCorrectException = true;
+        } catch (Throwable e) {
+            throw new RuntimeException("Test failed.", e);
+        }
+        if (!gotCorrectException) {
+            throw new RuntimeException("Test failed.");
+        }
+
+        /**
+         * set up output stream
+         */
+        ByteArrayOutputStream baos =
+            new ByteArrayOutputStream();
+
+        ImageOutputStream ios =
+            ImageIO.createImageOutputStream(baos);
+
+        w.setOutput(ios);
+
+        /**
+         * check statement: "Throws: IllegalStateException -
+         * if .... prepareWriteSequence has not been called.
+         */
+        gotCorrectException = false;
+        try {
+            w.endWriteSequence();
+        } catch  (IllegalStateException e) {
+            gotCorrectException = true;
+        } catch (Throwable e) {
+            throw new RuntimeException("Test failed.", e);
+        }
+        if (!gotCorrectException) {
+            throw new RuntimeException("Test failed.");
+        }
+
+        System.out.println("Test passed.");
+    }
+}