sdks/java/core/src/test/java/org/apache/beam/sdk/io/LocalFileSystemRegistrarTest.java

/*
 * 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 org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;

import java.util.ServiceLoader;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Lists;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link LocalFileSystemRegistrar}. */
@RunWith(JUnit4.class)
public class LocalFileSystemRegistrarTest {

  @Test
  public void testServiceLoader() {
    for (FileSystemRegistrar registrar :
        Lists.newArrayList(ServiceLoader.load(FileSystemRegistrar.class).iterator())) {
      if (registrar instanceof LocalFileSystemRegistrar) {
        Iterable<FileSystem> fileSystems = registrar.fromOptions(PipelineOptionsFactory.create());
        assertThat(fileSystems, contains(instanceOf(LocalFileSystem.class)));
        return;
      }
    }
    fail("Expected to find " + LocalFileSystemRegistrar.class);
  }
}