if (!vertices.contains(vertex)) {
            vertices.add(vertex);
        }

        if (parentVertex != null) // then create the edge
        {
            ArtifactMetadata md = node.getMd();
            MetadataGraphEdge e =
                    new MetadataGraphEdge(md.version, md.resolved, md.artifactScope, md.artifactUri, depth, pomOrder);

        pd.setDependencyNode(node);

        MojoDescriptor md = new MojoDescriptor();
        md.setGoal("my-goal");
        md.setPluginDescriptor(pd);

        pd.addComponentDescriptor(md);

        return new DefaultMojoExecution(
                InternalMavenSession.from(session), new org.apache.maven.plugin.MojoExecution(md));
    }

    private DefaultSession newSession() throws Exception {

        pd.setArtifactId("my-plugin");
        pd.setGroupId("org.myco.plugins");
        pd.setVersion("1");

        MojoDescriptor md = new MojoDescriptor();
        md.setPluginDescriptor(pd);

        pd.addComponentDescriptor(md);

        return new MojoExecution(md);
    }

    private MavenSession newMavenSession() throws Exception {
        return createMavenSession(null);
    }

            writer.write(artifact.getId());
        }

        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(artifact.getId().getBytes());
        byte[] digest = md.digest();

        String md5path = repository.pathOf(artifact) + ".md5";
        File md5artifactFile = new File(repository.getBasedir(), md5path);

        <version>${mercuryVersion}</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.apache.maven.mercury</groupId>
        <artifactId>mercury-md-sat</artifactId>
        <version>${mercuryVersion}</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.apache.maven.mercury</groupId>

        <version>${mercuryVersion}</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.apache.maven.mercury</groupId>
        <artifactId>mercury-md-sat</artifactId>
        <version>${mercuryVersion}</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.apache.maven.mercury</groupId>

        <version>${mercuryVersion}</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.apache.maven.mercury</groupId>
        <artifactId>mercury-md-sat</artifactId>
        <version>${mercuryVersion}</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.apache.maven.mercury</groupId>

            expectedChecksum = expectedChecksum.trim();

            // check for 'ALGO (name) = CHECKSUM' like used by openssl
            if (expectedChecksum.regionMatches(true, 0, "MD", 0, 2)
                    || expectedChecksum.regionMatches(true, 0, "SHA", 0, 3)) {
                int lastSpacePos = expectedChecksum.lastIndexOf(' ');