ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
            PrintStream ps = new PrintStream(os);
            ps.println(
                    "A required class was missing while executing " + mojoDescriptor.getId() + ": " + e.getMessage());
            pluginRealm.display(ps);
            Exception wrapper = new PluginContainerException(mojoDescriptor, pluginRealm, os.toString(), e);

  a result turning off certain services provided by m2 and providing a coherent
  way of predicting and reporting when network-related failures will take place.
  It means warning users that since the network is missing, certain features and
  operations will be unavailable, rather than simply waiting for those
  operations to fail, then trying to help users decipher the error messages they
  get as a result.

            return false;
        }

        String path;
        boolean missing;

        if (file.getExists() != null && !file.getExists().isEmpty()) {
            path = file.getExists();
            missing = false;
        } else if (file.getMissing() != null && !file.getMissing().isEmpty()) {
            path = file.getMissing();
            missing = true;
        } else {
            return false;
        }

- artifact metadata missing
- extension metadata missing
- extension artifact missing
- artifact metadata retrieval problem
- version range violation
- circular dependency
- artifact missing
- artifact retrieval exception
- md5 checksum doesn't match for local artifact, need to redownload this
- POM doesn't exist for a goal that requires one
- parent POM missing (in both the repository + relative path)

            } catch (InterpolationException e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to interpolate missing file location for profile activator: " + fileString, e);
                } else {
                    logger.warn("Failed to interpolate missing file location for profile activator: " + fileString
                            + ", enable verbose output (-X) for more details");
                }

                        .exists(settingsFile.getExists())
                        .missing(settingsFile.getMissing())
                        .location("exists", toLocation(settingsFile.getLocation("exists")))
                        .location("missing", toLocation(settingsFile.getLocation("missing")))
                        .build());
            }

 *
 */
class ArtifactResolutionExceptionTest {
    private static final String LS = System.lineSeparator();

    @Test
    void testMissingArtifactMessageFormat() {
        String message = "Missing artifact";
        String indentation = "  ";
        String groupId = "aGroupId";
        String artifactId = "anArtifactId";
        String version = "aVersion";
        String type = "jar";

        assertThat(
                e.getResults(),
                contains(projectBuildingResultWithProblemMessage(
                        "'dependencies.dependency.version' for org.apache.maven.its:a:jar is missing")));
        assertThat(e.getResults(), contains(projectBuildingResultWithLocation(5, 9)));
    }

    @Test
    void testResolveDependencies() throws Exception {

    @Inject
    private ArtifactRepositoryFactory artifactRepositoryFactory;

    @Test
    void testUnnecessaryRepositoryLookup() throws Exception {
        Artifact artifact = createTestPomArtifact("target/test-data/get-missing-pom");

        List<ArtifactRepository> repos = new ArrayList<>();
        repos.add(artifactRepositoryFactory.createArtifactRepository(
                "repo1", "string://url1", new ArtifactRepositoryLayoutStub(), null, null));

            return false;
        }

        if (!string.isEmpty()) {
            return true;
        }

        addViolation(problems, BuilderProblem.Severity.ERROR, fieldName, sourceHint, "is missing");

        return false;
    }

    /**
     * Asserts:
     * <p/>
     * <ul>
     * <li><code>string != null</code>
     * </ul>
     */
    private static boolean validateNotNull(