@Test
  public void storeProjectWithOneDependencyAndRetrieveAsDependent() throws Exception {
    final EProjectDirectRelationships rels =
        new EProjectDirectRelationships.Builder(
                sourceUri, new SimpleProjectVersionRef("org.apache.maven", "maven-core", "3.0.3"))
            .withDependency(
                new SimpleProjectVersionRef("org.apache.maven", "maven-artifact", "3.0.3"),
                null,
                null,
                null,
                false,
                false)
            .build();

    graph.storeRelationships(rels.getExactAllRelationships());

    final Set<ProjectRelationship<?, ?>> dependents =
        graph.findDirectRelationshipsTo(
            rels.getDependencies().get(0).getTarget(), false, RelationshipType.DEPENDENCY);

    assertThat(dependents, notNullValue());
    assertThat(dependents.size(), equalTo(1));
    assertThat(dependents.iterator().next().getDeclaring(), equalTo(rels.getProjectRef()));
  }
  @Test
  public void storeProjectAndRetrieveDependentProjectForEach() throws Exception {
    //        graph.reindex();
    //
    final ProjectVersionRef p =
        new SimpleProjectVersionRef("org.apache.maven", "maven-core", "3.0.3");

    final EProjectDirectRelationships.Builder prb =
        new EProjectDirectRelationships.Builder(sourceUri, p);

    final ProjectVersionRef parent =
        new SimpleProjectVersionRef("org.apache.maven", "maven", "3.0.3");

    int idx = 0;
    int pidx = 0;
    final DependencyRelationship papi =
        new SimpleDependencyRelationship(
            sourceUri,
            p,
            new SimpleArtifactRef(
                "org.apache.maven", "maven-plugin-api", "3.0.3", null, null, false),
            DependencyScope.compile,
            idx++,
            false,
            false);
    final DependencyRelationship art =
        new SimpleDependencyRelationship(
            sourceUri,
            p,
            new SimpleArtifactRef("org.apache.maven", "maven-artifact", "3.0.3", null, null, false),
            DependencyScope.compile,
            idx++,
            false,
            false);
    final PluginRelationship jarp =
        new SimplePluginRelationship(
            sourceUri,
            p,
            new SimpleProjectVersionRef("org.apache.maven.plugins", "maven-jar-plugin", "2.2"),
            pidx++,
            false,
            false);
    final PluginRelationship comp =
        new SimplePluginRelationship(
            sourceUri,
            p,
            new SimpleProjectVersionRef(
                "org.apache.maven.plugins", "maven-compiler-plugin", "2.3.2"),
            pidx++,
            false,
            false);
    final ExtensionRelationship wag =
        new SimpleExtensionRelationship(
            sourceUri,
            p,
            new SimpleProjectVersionRef("org.apache.maven.wagon", "wagon-provider-webdav", "1.0"),
            0,
            false);

    prb.withParent(parent);
    prb.withDependencies(papi);
    prb.withDependencies(art);
    prb.withPlugins(jarp);
    prb.withPlugins(comp);
    prb.withExtensions(wag);

    final EProjectDirectRelationships rels = prb.build();

    final Set<ProjectRelationship<?, ?>> rejected =
        graph.storeRelationships(rels.getExactAllRelationships());
    System.out.println("Rejects: " + rejected);

    final Map<ProjectVersionRef, Set<ProjectRelationship<?, ?>>> byTarget =
        new HashMap<ProjectVersionRef, Set<ProjectRelationship<?, ?>>>() {
          private static final long serialVersionUID = 1L;

          {
            put(parent, graph.findDirectRelationshipsTo(parent, true, RelationshipType.values()));
            put(
                papi.getTarget(),
                graph.findDirectRelationshipsTo(papi.getTarget(), true, RelationshipType.values()));
            put(
                art.getTarget(),
                graph.findDirectRelationshipsTo(art.getTarget(), true, RelationshipType.values()));
            put(
                jarp.getTarget(),
                graph.findDirectRelationshipsTo(jarp.getTarget(), true, RelationshipType.values()));
            put(
                comp.getTarget(),
                graph.findDirectRelationshipsTo(comp.getTarget(), true, RelationshipType.values()));
            put(
                wag.getTarget(),
                graph.findDirectRelationshipsTo(wag.getTarget(), true, RelationshipType.values()));
          }
        };

    for (final Map.Entry<ProjectVersionRef, Set<ProjectRelationship<?, ?>>> entry :
        byTarget.entrySet()) {
      System.out.printf(
          "\n\n\nFor key: %s, dependencies:\n  %s\n\n\n",
          entry.getKey(), formatWithClassname(entry.getValue(), "\n  "));

      assertThat(
          "Null dependents set for: " + entry.getKey() + "!", entry.getValue(), notNullValue());

      assertThat(
          "Should have exactly one matching dependent of: " + entry.getKey(),
          entry.getValue().size(),
          equalTo(1));
      assertThat(
          "Invalid dependent of: " + entry.getKey(),
          entry.getValue().iterator().next().getDeclaring(),
          equalTo(rels.getProjectRef()));
    }
  }
  @Test
  public void storeProjectAndRetrieveAllRelationshipsInOneGo() throws Exception {
    final ProjectVersionRef p =
        new SimpleProjectVersionRef("org.apache.maven", "maven-core", "3.0.3");

    final EProjectDirectRelationships.Builder prb =
        new EProjectDirectRelationships.Builder(sourceUri, p);

    final ProjectVersionRef parent =
        new SimpleProjectVersionRef("org.apache.maven", "maven", "3.0.3");

    int idx = 0;
    int pidx = 0;
    final DependencyRelationship papi =
        new SimpleDependencyRelationship(
            sourceUri,
            p,
            new SimpleArtifactRef(
                "org.apache.maven", "maven-plugin-api", "3.0.3", null, null, false),
            DependencyScope.compile,
            idx++,
            false,
            false);
    final DependencyRelationship art =
        new SimpleDependencyRelationship(
            sourceUri,
            p,
            new SimpleArtifactRef("org.apache.maven", "maven-artifact", "3.0.3", null, null, false),
            DependencyScope.compile,
            idx++,
            false,
            false);
    final PluginRelationship jarp =
        new SimplePluginRelationship(
            sourceUri,
            p,
            new SimpleProjectVersionRef("org.apache.maven.plugins", "maven-jar-plugin", "2.2"),
            pidx++,
            false,
            false);
    final PluginRelationship comp =
        new SimplePluginRelationship(
            sourceUri,
            p,
            new SimpleProjectVersionRef(
                "org.apache.maven.plugins", "maven-compiler-plugin", "2.3.2"),
            pidx++,
            false,
            false);
    final ExtensionRelationship wag =
        new SimpleExtensionRelationship(
            sourceUri,
            p,
            new SimpleProjectVersionRef("org.apache.maven.wagon", "wagon-provider-webdav", "1.0"),
            0,
            false);

    prb.withParent(parent);
    prb.withDependencies(papi, art);
    prb.withPlugins(jarp, comp);
    prb.withExtensions(wag);

    final EProjectDirectRelationships rels = prb.build();

    assertThat(rels.getAllRelationships().size(), equalTo(6));

    graph.storeRelationships(rels.getExactAllRelationships());

    final Set<ProjectRelationship<?, ?>> resulting =
        graph.findDirectRelationshipsFrom(rels.getProjectRef(), false, RelationshipType.values());

    final Set<ProjectVersionRef> targets = RelationshipUtils.targets(resulting);

    assertThat(targets.size(), equalTo(6));
    assertThat(targets.contains(parent), equalTo(true));
    assertThat(targets.contains(papi.getTarget()), equalTo(true));
    assertThat(targets.contains(art.getTarget()), equalTo(true));
    assertThat(targets.contains(jarp.getTarget()), equalTo(true));
    assertThat(targets.contains(comp.getTarget()), equalTo(true));
    assertThat(targets.contains(wag.getTarget()), equalTo(true));
  }