[GitHub] [beam] robertwb commented on a change in pull request #11708: [BEAM-9577] Artifact v2 support for uber jars.

[GitBox <gi...@apache.org>]

robertwb commented on a change in pull request #11708:
URL: https://github.com/apache/beam/pull/11708#discussion_r425462707



##########
File path: sdks/java/core/src/test/java/org/apache/beam/sdk/io/ClassLoaderFileSystemTest.java
##########
@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.beam.sdk.io;
+
+import static java.nio.channels.Channels.newInputStream;
+import static org.junit.Assert.assertArrayEquals;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.channels.ReadableByteChannel;
+import org.apache.beam.sdk.options.PipelineOptionsFactory;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class ClassLoaderFileSystemTest {
+
+  private static final String SOME_CLASS =
+      "classpath://org/apache/beam/sdk/io/ClassLoaderFilesystem.class";
+
+  @Test
+  public void testOpen() throws IOException {
+    ClassLoaderFileSystem filesystem = new ClassLoaderFileSystem();
+    ReadableByteChannel channel = filesystem.open(filesystem.matchNewResource(SOME_CLASS, false));
+    checkIsClass(channel);
+  }
+
+  @Test
+  public void testRegistrar() throws IOException {
+    ReadableByteChannel channel = FileSystems.open(FileSystems.matchNewResource(SOME_CLASS, false));
+    checkIsClass(channel);
+  }
+
+  public void checkIsClass(ReadableByteChannel channel) throws IOException {
+    FileSystems.setDefaultPipelineOptions(PipelineOptionsFactory.create());
+    InputStream inputStream = newInputStream(channel);
+    byte[] magic = new byte[4];
+    inputStream.read(magic);
+    assertArrayEquals(magic, new byte[] {(byte) 0xCA, (byte) 0xFE, (byte) 0xBA, (byte) 0xBE});

Review comment:
       It's used on the Python side.




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