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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.eclipse.aether.internal.impl;
  
  import org.eclipse.aether.DefaultRepositorySystemSession;
  import org.eclipse.aether.internal.test.util.TestUtils;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.repository.RepositoryPolicy;
  import org.eclipse.aether.spi.connector.checksum.ChecksumPolicy;
  import org.eclipse.aether.transfer.TransferResource;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.core.Is.is;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertThrows;
  
  public class DefaultChecksumPolicyProviderTest {
  
      private static final String CHECKSUM_POLICY_UNKNOWN = "unknown";
  
      private DefaultRepositorySystemSession session;
  
      private DefaultChecksumPolicyProvider provider;
  
      private RemoteRepository repository;
  
      private TransferResource resource;
  
      @Before
      public void setup() {
          session = TestUtils.newSession();
          provider = new DefaultChecksumPolicyProvider();
          repository = new RemoteRepository.Builder("test", "default", "file:/void").build();
          resource = new TransferResource(repository.getId(), repository.getUrl(), "file.txt", null, null);
      }
  
      @After
      public void teardown() {
          provider = null;
          session = null;
          repository = null;
          resource = null;
      }
  
      @Test
      public void testNewChecksumPolicy_Fail() {
          ChecksumPolicy policy =
                  provider.newChecksumPolicy(session, repository, resource, RepositoryPolicy.CHECKSUM_POLICY_FAIL);
          assertNotNull(policy);
          assertEquals(FailChecksumPolicy.class, policy.getClass());
      }
  
      @Test
      public void testNewChecksumPolicy_Warn() {
          ChecksumPolicy policy =
                  provider.newChecksumPolicy(session, repository, resource, RepositoryPolicy.CHECKSUM_POLICY_WARN);
          assertNotNull(policy);
          assertEquals(WarnChecksumPolicy.class, policy.getClass());
      }
  
      @Test
      public void testNewChecksumPolicy_Ignore() {
          ChecksumPolicy policy =
                  provider.newChecksumPolicy(session, repository, resource, RepositoryPolicy.CHECKSUM_POLICY_IGNORE);
          assertNull(policy);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void testNewChecksumPolicy_Unknown() {
          ChecksumPolicy policy = provider.newChecksumPolicy(session, repository, resource, CHECKSUM_POLICY_UNKNOWN);
          assertNotNull(policy);
          assertEquals(WarnChecksumPolicy.class, policy.getClass());
      }
  
      @Test
      public void testGetEffectiveChecksumPolicy_EqualPolicies() {
          String[] policies = {
              RepositoryPolicy.CHECKSUM_POLICY_FAIL,
             RepositoryPolicy.CHECKSUM_POLICY_WARN,
             RepositoryPolicy.CHECKSUM_POLICY_IGNORE
         };
         for (String policy : policies) {
             assertEquals(policy, policy, provider.getEffectiveChecksumPolicy(session, policy, policy));
         }
     }
 
     @Test
     public void testGetEffectiveChecksumPolicy_DifferentPolicies() {
         String[][] testCases = {
             {RepositoryPolicy.CHECKSUM_POLICY_WARN, RepositoryPolicy.CHECKSUM_POLICY_FAIL},
             {RepositoryPolicy.CHECKSUM_POLICY_IGNORE, RepositoryPolicy.CHECKSUM_POLICY_FAIL},
             {RepositoryPolicy.CHECKSUM_POLICY_IGNORE, RepositoryPolicy.CHECKSUM_POLICY_WARN}
         };
         for (String[] testCase : testCases) {
             assertEquals(
                     testCase[0] + " vs " + testCase[1],
                     testCase[0],
                     provider.getEffectiveChecksumPolicy(session, testCase[0], testCase[1]));
             assertEquals(
                     testCase[0] + " vs " + testCase[1],
                     testCase[0],
                     provider.getEffectiveChecksumPolicy(session, testCase[1], testCase[0]));
         }
     }
 
     @Test
     public void testGetEffectiveChecksumPolicy_UnknownPolicies() {
         String[][] testCases = {
             {RepositoryPolicy.CHECKSUM_POLICY_WARN, RepositoryPolicy.CHECKSUM_POLICY_FAIL},
             {RepositoryPolicy.CHECKSUM_POLICY_WARN, RepositoryPolicy.CHECKSUM_POLICY_WARN},
             {RepositoryPolicy.CHECKSUM_POLICY_IGNORE, RepositoryPolicy.CHECKSUM_POLICY_IGNORE}
         };
         for (String[] testCase : testCases) {
             IllegalArgumentException e = assertThrows(
                     IllegalArgumentException.class,
                     () -> provider.getEffectiveChecksumPolicy(session, CHECKSUM_POLICY_UNKNOWN, testCase[1]));
             assertThat(e.getMessage(), is("Unsupported policy: unknown"));
             e = assertThrows(
                     IllegalArgumentException.class,
                     () -> provider.getEffectiveChecksumPolicy(session, testCase[1], CHECKSUM_POLICY_UNKNOWN));
             assertThat(e.getMessage(), is("Unsupported policy: unknown"));
         }
     }
 }