--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/sun/net/www/protocol/jar/CanonicalizationTest.java	Wed Feb 14 19:03:12 2018 +0100
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018, 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 8197849
+ * @summary Sanity test the special canonicalization logic for jar resources
+ */
+
+import java.net.URL;
+
+public class CanonicalizationTest {
+    public static void main(String args[]) throws Exception {
+        URL base = new URL("jar:file:/foo!/");
+
+        check(new URL(base, ""), "jar:file:/foo!/");
+        check(new URL(base, "."), "jar:file:/foo!/");
+        check(new URL(base, ".."), "jar:file:/foo!");
+        check(new URL(base, ".x"), "jar:file:/foo!/.x");
+        check(new URL(base, "..x"), "jar:file:/foo!/..x");
+        check(new URL(base, "..."), "jar:file:/foo!/...");
+        check(new URL(base, "foo/."), "jar:file:/foo!/foo/");
+        check(new URL(base, "foo/.."), "jar:file:/foo!/");
+        check(new URL(base, "foo/.x"), "jar:file:/foo!/foo/.x");
+        check(new URL(base, "foo/..x"), "jar:file:/foo!/foo/..x");
+        check(new URL(base, "foo/..."), "jar:file:/foo!/foo/...");
+        check(new URL(base, "foo/./"), "jar:file:/foo!/foo/");
+        check(new URL(base, "foo/../"), "jar:file:/foo!/");
+        check(new URL(base, "foo/.../"), "jar:file:/foo!/foo/.../");
+        check(new URL(base, "foo/../../"), "jar:file:/foo!/");
+        check(new URL(base, "foo/../,,/.."), "jar:file:/foo!/");
+        check(new URL(base, "foo/../."), "jar:file:/foo!/");
+        check(new URL(base, "foo/../.x"), "jar:file:/foo!/.x");
+    }
+
+    private static void check(URL url, String expected) {
+        if (!url.toString().equals(expected)) {
+            throw new AssertionError("Expected " + url + " to equal " + expected);
+        }
+    }
+}