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    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
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    *
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  package org.apache.maven.lifecycle.internal.builder.multithreaded;
  
  import java.util.List;
  import java.util.Set;
  
  import org.apache.maven.execution.ProjectDependencyGraph;
  import org.apache.maven.lifecycle.internal.ProjectBuildList;
  import org.apache.maven.lifecycle.internal.stub.ProjectDependencyGraphStub;
  import org.apache.maven.project.MavenProject;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  class ConcurrencyDependencyGraphTest {
  
      @Test
      void testGraph() throws Exception {
  
          ProjectBuildList projectBuildList =
                  ProjectDependencyGraphStub.getProjectBuildList(ProjectDependencyGraphStub.getMavenSession());
  
          ProjectDependencyGraph projectDependencyGraph = new ProjectDependencyGraphStub();
  
          ConcurrencyDependencyGraph graph = new ConcurrencyDependencyGraph(projectBuildList, projectDependencyGraph);
  
          // start
          assertEquals(0, graph.getFinishedProjects().size());
          assertEquals(6, graph.getNumberOfBuilds());
  
          List<MavenProject> rootSchedulableBuilds = graph.getRootSchedulableBuilds();
          // only Project.A has no dependencies
          assertEquals(1, rootSchedulableBuilds.size());
          assertEquals(
                  ProjectDependencyGraphStub.A, rootSchedulableBuilds.iterator().next());
          // double check A deps
          List<MavenProject> dependenciesA = graph.getDependencies(ProjectDependencyGraphStub.A);
          assertEquals(0, dependenciesA.size());
  
          assertEquals(6, graph.getUnfinishedProjects().size());
  
          List<MavenProject> schedulableNewProcesses = graph.markAsFinished(ProjectDependencyGraphStub.A);
          // expect Project B, C
          assertEquals(2, schedulableNewProcesses.size());
          assertEquals(1, graph.getFinishedProjects().size());
  
          graph.markAsFinished(ProjectDependencyGraphStub.A);
          // still only  A
          assertEquals(1, graph.getFinishedProjects().size());
  
          Set<MavenProject> unfinishedProjects = graph.getUnfinishedProjects();
          assertEquals(5, unfinishedProjects.size());
  
          graph.markAsFinished(schedulableNewProcesses.get(0));
          assertEquals(2, graph.getFinishedProjects().size());
          assertEquals(4, graph.getUnfinishedProjects().size());
  
          List<MavenProject> dependenciesC = graph.getDependencies(ProjectDependencyGraphStub.C);
          // C depends only on A
          assertEquals(1, dependenciesC.size());
  
          List<MavenProject> dependenciesX = graph.getDependencies(ProjectDependencyGraphStub.X);
          // X depends only on B and C
          assertEquals(2, dependenciesX.size());
  
          List<MavenProject> activeDependenciesC = graph.getActiveDependencies(ProjectDependencyGraphStub.C);
          // A already finished
          assertEquals(0, activeDependenciesC.size());
  
          List<MavenProject> activeDependenciesX = graph.getActiveDependencies(ProjectDependencyGraphStub.X);
          // waiting for C
          assertEquals(1, activeDependenciesX.size());
      }
  }