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   * 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.util.construction;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.startsWith;
  import static org.junit.Assert.fail;
  
  import java.util.Optional;
  import org.apache.beam.model.pipeline.v1.RunnerApi;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class DefaultArtifactResolverTest {
    private RunnerApi.Pipeline createEmptyPipeline(
        Iterable<RunnerApi.ArtifactInformation> dependencies) {
      return RunnerApi.Pipeline.newBuilder()
          .setComponents(
              RunnerApi.Components.newBuilder()
                  .putEnvironments(
                      "env",
                      RunnerApi.Environment.newBuilder().addAllDependencies(dependencies).build()))
          .build();
    }
  
    // Testing artifacts
    private RunnerApi.ArtifactInformation fooMavenArtifact =
        RunnerApi.ArtifactInformation.newBuilder()
            .setTypeUrn(BeamUrns.getUrn(RunnerApi.StandardArtifacts.Types.MAVEN))
            .setTypePayload(
                RunnerApi.MavenPayload.newBuilder()
                    .setArtifact("org.apache:foo:1.0")
                    .build()
                    .toByteString())
            .build();
  
    private RunnerApi.ArtifactInformation fooFileArtifact =
        RunnerApi.ArtifactInformation.newBuilder()
            .setTypeUrn(BeamUrns.getUrn(RunnerApi.StandardArtifacts.Types.FILE))
            .setTypePayload(
                RunnerApi.ArtifactFilePayload.newBuilder().setPath("foo.jar").build().toByteString())
            .build();
  
    private RunnerApi.ArtifactInformation barFileArtifact =
        RunnerApi.ArtifactInformation.newBuilder()
            .setTypeUrn(BeamUrns.getUrn(RunnerApi.StandardArtifacts.Types.FILE))
            .setTypePayload(
                RunnerApi.ArtifactFilePayload.newBuilder().setPath("bar.jar").build().toByteString())
            .build();
  
    private RunnerApi.ArtifactInformation ambientArtifact =
        RunnerApi.ArtifactInformation.newBuilder()
            .setTypeUrn(BeamUrns.getUrn(RunnerApi.StandardArtifacts.Types.DEFERRED))
            .setTypePayload(
                RunnerApi.DeferredArtifactPayload.newBuilder()
                    .setKey("test-key")
                    .build()
                    .toByteString())
            .build();
  
    // Testing Resolvers
    private ArtifactResolver.ResolutionFn dummyMavenFooResolver =
        info -> {
          if (info.equals(fooMavenArtifact)) {
            return Optional.of(ImmutableList.of(fooFileArtifact));
          } else {
            return Optional.empty();
          }
        };
  
    private ArtifactResolver.ResolutionFn dummyAmbientFooBarResolver =
        info -> {
          if (info.equals(ambientArtifact)) {
            return Optional.of(ImmutableList.of(fooFileArtifact, barFileArtifact));
          } else {
            return Optional.empty();
          }
        };
  
    private ArtifactResolver.ResolutionFn dummyAmbientBarFooResolver =
        info -> {
          if (info.equals(ambientArtifact)) {
            return Optional.of(ImmutableList.of(fooFileArtifact, barFileArtifact));
          } else {
            return Optional.empty();
          }
        };
  
    @Test
    public void testOverridesResolver() {
      ArtifactResolver resolver = new DefaultArtifactResolver();
      resolver.register(dummyAmbientBarFooResolver);
      resolver.register(dummyAmbientFooBarResolver);
      RunnerApi.Pipeline pipeline =
          resolver.resolveArtifacts(createEmptyPipeline(ImmutableList.of(ambientArtifact)));
      assertThat(
          createEmptyPipeline(ImmutableList.of(fooFileArtifact, barFileArtifact)), equalTo(pipeline));
    }
  
    @Test
    public void testUnknownArtifactInformation() {
      ArtifactResolver resolver = new DefaultArtifactResolver();
      resolver.register(dummyMavenFooResolver);
      try {
        resolver.resolveArtifacts(
            createEmptyPipeline(ImmutableList.of(fooMavenArtifact, ambientArtifact)));
        fail();
      } catch (RuntimeException e) {
        assertThat(e.getMessage(), startsWith("Cannot resolve artifact information:"));
      }
    }
  }
  