Issue #3906 - Introducing Testcase to demonstrate issue

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

jetty-util/src/test/java/org/eclipse/jetty/util/resource/PathResourceTest.java

@@ -0,0 +1,71 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.util.resource;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.channels.ReadableByteChannel;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.eclipse.jetty.toolchain.test.MavenTestingUtils;
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.nullValue;
+
+public class PathResourceTest
+{
+    @Test
+    public void testNonDefaultFileSystem_GetInputStream() throws URISyntaxException, IOException
+    {
+        Path exampleJar = MavenTestingUtils.getTestResourcePathFile("example.jar");
+
+        URI uri = new URI("jar", exampleJar.toUri().toASCIIString(), null);
+        System.err.println("URI = " + uri);
+
+        Map<String, Object> env = new HashMap<>();
+        env.put("multi-release", "runtime");
+
+        try (FileSystem zipfs = FileSystems.newFileSystem(uri, env))
+        {
+            Path manifestPath = zipfs.getPath("/META-INF/MANIFEST.MF");
+            assertThat(manifestPath, is(not(nullValue())));
+
+            PathResource resource = new PathResource(manifestPath);
+
+            try (ReadableByteChannel channel = resource.getReadableByteChannel())
+            {
+                assertThat("ReadableByteChannel", channel, is(not(nullValue())));
+            }
+
+            try (InputStream inputStream = resource.getInputStream())
+            {
+                assertThat("InputStream", inputStream, is(not(nullValue())));
+            }
+        }
+    }
+}