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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
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   * under the License.
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  package org.eclipse.aether.internal.impl.checksum;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.checksums.TrustedChecksumsSource;
  import org.eclipse.aether.spi.connector.ArtifactDownload;
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.hasEntry;
  import static org.hamcrest.Matchers.notNullValue;
  import static org.hamcrest.Matchers.nullValue;
  import static org.mockito.ArgumentMatchers.eq;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  public class TrustedToProvidedChecksumsSourceAdapterTest {
      private final Artifact artifactWithChecksum = new DefaultArtifact("g:a:v1");
  
      private final Artifact artifactWithoutChecksum = new DefaultArtifact("g:a:v2");
  
      private final RemoteRepository repository =
              new RemoteRepository.Builder("repo", "default", "https://example.com").build();
  
      private final List<ChecksumAlgorithmFactory> checksums =
              Collections.singletonList(new Sha1ChecksumAlgorithmFactory());
  
      private final RepositorySystemSession session = mock(RepositorySystemSession.class);
  
      private final TrustedChecksumsSource trustedChecksumsSource = mock(TrustedChecksumsSource.class);
  
      private TrustedToProvidedChecksumsSourceAdapter adapter;
  
      @Before
      public void before() {
          HashMap<String, String> result = new HashMap<>();
          result.put(Sha1ChecksumAlgorithmFactory.NAME, "foo");
          when(trustedChecksumsSource.getTrustedArtifactChecksums(
                          eq(session), eq(artifactWithChecksum), eq(repository), eq(checksums)))
                  .thenReturn(result);
          adapter = new TrustedToProvidedChecksumsSourceAdapter(
                  Collections.singletonMap("trusted", trustedChecksumsSource));
      }
  
      @Test
      public void testSimplePositive() {
          ArtifactDownload transfer = new ArtifactDownload();
          transfer.setArtifact(artifactWithChecksum);
          Map<String, String> chk = adapter.getProvidedArtifactChecksums(session, transfer, repository, checksums);
          assertThat(chk, notNullValue());
          assertThat(chk, hasEntry(Sha1ChecksumAlgorithmFactory.NAME, "foo"));
      }
  
      @Test
      public void testSimpleNegative() {
          ArtifactDownload transfer = new ArtifactDownload();
          transfer.setArtifact(artifactWithoutChecksum);
          Map<String, String> chk = adapter.getProvidedArtifactChecksums(session, transfer, repository, checksums);
          assertThat(chk, nullValue());
      }
  
      @Test
      public void testMrmPositive() {
          RemoteRepository mrm = new RemoteRepository.Builder("mrm", "default", "https://example.com").build();
          ArtifactDownload transfer = new ArtifactDownload();
          transfer.setArtifact(artifactWithChecksum);
          transfer.setRepositories(Collections.singletonList(repository));
          Map<String, String> chk = adapter.getProvidedArtifactChecksums(session, transfer, mrm, checksums);
          assertThat(chk, notNullValue());
          assertThat(chk, hasEntry(Sha1ChecksumAlgorithmFactory.NAME, "foo"));
      }
  
     @Test
     public void testMrmNegative() {
         RemoteRepository mrm = new RemoteRepository.Builder("mrm", "default", "https://example.com").build();
         ArtifactDownload transfer = new ArtifactDownload();
         transfer.setArtifact(artifactWithoutChecksum);
         transfer.setRepositories(Collections.singletonList(repository));
         Map<String, String> chk = adapter.getProvidedArtifactChecksums(session, transfer, mrm, checksums);
         assertThat(chk, nullValue());
     }
 }