package org.apache.maven.surefire.spi;
   
   /*
    * 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.
   */
  
  import org.apache.maven.plugin.surefire.booterclient.ProviderDetector;
  import org.apache.maven.surefire.providerapi.ServiceLoader;
  import org.junit.Test;
  
  import java.io.IOException;
  
  import static java.lang.Thread.currentThread;
  import static org.fest.assertions.Assertions.assertThat;
  
  /**
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 2.20
   */
  public class SPITest
  {
      private final ServiceLoader spi = new ServiceLoader();
      private final ProviderDetector providerDetector = new ProviderDetector();
      private final ClassLoader ctx = currentThread().getContextClassLoader();
  
      @Test
      public void shouldNotLoadSpiDoesNotExist() throws IOException
      {
          assertThat( spi.lookup( NoServiceInterface.class, ctx ) )
                  .isEmpty();
  
          assertThat( spi.load( NoServiceInterface.class, ctx ) )
                  .isEmpty();
  
          assertThat( providerDetector.lookupServiceNames( NoServiceInterface.class, ctx ) )
                  .isEmpty();
      }
  
      @Test
      public void shouldNotLoadEmptySpi() throws IOException
      {
          assertThat( spi.lookup( EmptyServiceInterface.class, ctx ) )
                  .isEmpty();
  
          assertThat( spi.load( EmptyServiceInterface.class, ctx ) )
                  .isEmpty();
  
          assertThat( providerDetector.lookupServiceNames( EmptyServiceInterface.class, ctx ) )
                  .isEmpty();
      }
  
      @Test
      public void shouldLoad2SpiObjects() throws IOException
      {
          assertThat( spi.lookup( ExistingServiceInterface.class, ctx ) )
                  .hasSize( 2 );
  
          assertThat( spi.lookup( ExistingServiceInterface.class, ctx ) )
                  .containsOnly( SPImpl1.class.getName(), SPImpl2.class.getName() );
  
  
          assertThat( spi.load( ExistingServiceInterface.class, ctx ) )
                  .hasSize( 2 );
  
          assertThat( spi.load( ExistingServiceInterface.class, ctx ) )
                  .contains( new SPImpl1(), new SPImpl2() );
  
  
          assertThat( providerDetector.lookupServiceNames( ExistingServiceInterface.class, ctx ) )
                  .hasSize( 2 );
  
          assertThat( providerDetector.lookupServiceNames( ExistingServiceInterface.class, ctx ) )
                  .containsOnly( SPImpl1.class.getName(), SPImpl2.class.getName() );
      }
  }