private void checkArtifactResult(ArtifactResult result, String filename) {
        assertFalse(result.isMissing(), "Expected " + result + ".isMissing() to return false");
        assertTrue(result.isResolved(), "Expected " + result + ".isResolved() to return true");
        Artifact artifact = result.getArtifact();
        assertNotNull(artifact.getFile());
        assertEquals(filename, artifact.getFile().getName());
    }

    @Test

        this.target = target;
        this.session = session;
        this.sourcePathProvider = sourcePathProvider;
        this.sourceState = new AtomicReference<>(null);
    }

    @Override
    public boolean isResolved() {
        return getFile() != null;
    }

    @Override
    public void setFile(File file) {
        throw new UnsupportedOperationException("transformed artifact file cannot be set");
    }

        }

        MetadataTreeNode tree = null;
        MetadataTreeNode parent = null;

        for (ArtifactMetadata md : classpath) {
            MetadataTreeNode node = new MetadataTreeNode(md, parent, md.isResolved(), md.getArtifactScope());
            if (tree == null) {
                tree = node;
            }

            if (parent != null) {
                parent.setNChildren(1);

                            edge.getSource() == null
                                    ? ""
                                    : edge.getSource().getMd().toString(),
                            edge.isResolved(),
                            edge.getTarget() == null
                                    ? null
                                    : edge.getTarget().getMd().getError());

                            e.getResult().getCollectExceptions().stream(),
                            e.getResult().getArtifactResults().stream()
                                    .filter(r -> !r.isResolved())
                                    .flatMap(r -> r.getExceptions().stream()))
                    .collect(Collectors.toList());
            throw new PluginResolutionException(plugin, exceptions, e);

    }

    @Override
    public void setResolved(boolean resolved) {
        this.resolved = resolved;
    }

    @Override
    public boolean isResolved() {
        return resolved;
    }

    @Override
    public void setResolvedVersion(String version) {
        this.version = version;
        // retain baseVersion
    }

    @Override

                    new org.apache.maven.model.Plugin(plugin), dependencyFilter, repositories, repoSession);
            return result.getArtifactResults().stream()
                    .filter(ArtifactResult::isResolved)
                    .map(ArtifactResult::getArtifact)
                    .collect(Collectors.toList());
        } catch (PluginResolutionException | InterpolatorException e) {

        for (ArtifactResult ar : results) {
            DependencyNode node = ar.getRequest().getDependencyNode();
            if (ar.isResolved()) {
                result.addResolvedDependency(node.getDependency());
            } else {
                result.setResolutionErrors(node.getDependency(), ar.getExceptions());
            }
        }
    }

                    new org.apache.maven.model.Plugin(plugin), dependencyFilter, repositories, repoSession);
            return result.getArtifactResults().stream()
                    .filter(ArtifactResult::isResolved)
                    .map(ArtifactResult::getArtifact)
                    .collect(Collectors.toList());
        } catch (PluginResolutionException | InterpolatorException e) {

                        artifact.getId(), "Error resolving project artifact: " + e.getMessage(), e);
            }

            Path pomFile = pomArtifact.getPath();

            if (!artifact.isResolved() && "pom".equals(artifact.getType())) {
                artifact.selectVersion(pomArtifact.getVersion());
                artifact.setFile(pomFile.toFile());
                artifact.setResolved(true);
            }