void testDefaultPolicy() throws Exception {
        MetadataGraphEdge res;

        res = policy.apply(e1, e2);
        assertEquals("1.1", res.getVersion(), "Wrong depth edge selected");

        res = policy.apply(e1, e3);
        assertEquals("1.2", res.getVersion(), "Wrong version edge selected");
    }
    // ------------------------------------------------------------------------------------------

    stem from Plexus Classworlds originally.
    <p><i>Notice:</i> this documentation is generated from a Modello model but the code executed is not generated
    from this descriptor. Please report if you find anything wrong.</p>
  ]]></description>
  <defaults>
    <default>
      <key>package</key>
      <value>extension descriptor XML documentation (no java generation)</value><!-- intentionally non-buildable value -->
    </default>

                .findFirst()
                .orElse(null);
        assertNotNull(pluginExecution, "Wrong id for \"" + artifactId + "\"");

        String config = pluginExecution.getConfiguration().toString();
        assertTrue(
                config.contains(expectedConfig),
                "Wrong config for \"" + artifactId + "\": (" + config + ") does not contain :" + expectedConfig);
    }

                    buffer.append(" and 'parent.relativePath' points at no local POM");
                } else {
                    buffer.append(" and 'parent.relativePath' points at wrong local POM");
                }
            }

            problems.add(Severity.FATAL, ModelProblem.Version.BASE, buffer.toString(), parent.getLocation(""), e);
            throw problems.newModelBuilderException();

        assertEquals(4, res.getVertices().size(), "wrong # of vertices in the resulting graph after resolver");
        assertEquals(
                2,
                res.getExcidentEdges(v1).size(),
                "wrong # of excident edges in the resulting graph entry after resolver");

        assertEquals(
                1,
                res.getIncidentEdges(v2).size(),

                    "Plugin should declare Maven artifacts in `provided` scope. If the plugin already declares them in `provided` scope, update the maven-plugin-plugin to latest version. Artifacts found with wrong scope: "
                            + mavenArtifacts);
        }
    }

        assertEquals(1, depResults.size());
        assertEquals(
                exec.getPlugin().getArtifact().key(),
                depResults.iterator().next().key(),
                "dependency artifact is wrong.");
    }

    @Test
    public void testPluginArtifactMapExpressionReference() throws Exception {
        Session session = newSession();

        MojoExecution exec = newMojoExecution(session);

        Artifact artifact = (Artifact) artifactMap.get( key );

        assertNotNull( artifact, "dependency artifact not found in map." );
        assertEquals( Artifact.SCOPE_COMPILE, artifact.getScope(), "dependency artifact has wrong scope." );

        //check for back-propagation of default scope.
        assertEquals( Artifact.SCOPE_COMPILE, dep.getScope(), "default scope NOT back-propagated to dependency." );
        */
    }

    @Test

        System.out.println("Result: " + depResults);

        assertNotNull(depResults);
        assertEquals(1, depResults.size());
        assertSame(depArtifact, depResults.get(0), "dependency artifact is wrong.");
    }

    @Test
    void testPluginArtifactMapExpressionReference() throws Exception {
        MojoExecution exec = newMojoExecution();

                // because it wasn't deployed, or it was deployed in the wrong place.

                synchronized (result) {
                    result.addMissingArtifact(artifact);
                }
            } catch (ArtifactResolutionException e) {
                // This is really a wagon TransferFailedException so something went wrong after we successfully
                // retrieved the metadata.