Exception getException();

    /**
     * Gets the message that describes this problem.
     *
     * @return the message describing this problem, never {@code null}
     */
    @Nonnull
    String getMessage();

    /**
     * Gets the severity level of this problem.
     *
     * @return the severity level of this problem, never {@code null}
     */
    @Nonnull
    Severity getSeverity();

    /**

        DeployResult result;
        try {
            result = repoSystem.deploy(session, request);
        } catch (DeploymentException e) {
            throw new ArtifactDeploymentException(e.getMessage(), e);
        }

        for (Object metadata : result.getMetadata()) {
            if (metadata.getClass().getName().endsWith(".internal.VersionsMetadata")) {

        try {
            return new PersistedToolchains(delegate.read(reader, strict, null));
        } catch (XMLStreamException e) {
            throw new XmlPullParserException(e.getMessage(), null, e);
        }
    }

    /**
     * @param reader a reader object.
     * @return PersistedToolchains
     * @throws IOException IOException if any.

        for (ModelProblem problem : problems) {
            writer.print("[");
            writer.print(problem.getSeverity());
            writer.print("] ");
            writer.print(problem.getMessage());
            writer.print(" @ ");
            writer.println(ModelProblemUtils.formatLocation(problem, modelId));
        }

        return buffer.toString();
    }

            line = e.getLineNumber();
            column = e.getColumnNumber();
        }

        ModelProblem problem = new DefaultModelProblem(
                req.getMessage(),
                req.getSeverity(),
                req.getVersion(),
                source,
                line,
                column,
                modelId,
                req.getException());

     */
    Exception getException();

    /**
     * Gets the message that describes this problem.
     *
     * @return The message describing this problem, never {@code null}.
     */
    String getMessage();

    /**
     * Gets the severity level of this problem.
     *
     * @return The severity level of this problem, never {@code null}.
     */
    Severity getSeverity();

    /**

        String cause = assertThrows(
                        IllegalArgumentException.class,
                        () -> projectManager.attachArtifact(project, artifact, artifactPath))
                .getMessage();
        Supplier<String> message = () ->
                String.format("The exception message does not contain the expected GAV. Message was:%n%s%n", cause);

        assertTrue(cause.contains(expectedGAV), message);

        String fullMessage = message + "\n" + "Exception: "
                + e.getClass().getName() + "\n" + "Message: "
                + e.getMessage() + "\n" + "Stack trace:\n"
                + stackTrace;

        processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, fullMessage);
    }

      actual = e;
    }
    assertNotNull("verify() should be able to cause test failure", actual);
    assertTrue(
        "AssertionError should have info about why test failed",
        actual.getCause().getMessage().contains(message));
  }

  public void testMissingException() {
    List<Integer> emptyList = new ArrayList<>();

    IteratorTester<Integer> tester =
        new IteratorTester<Integer>(

                IllegalStateException.class,
                () -> assertActivation(false, newExistsProfile("${project.rootDirectory}"), context));
        assertEquals(RootLocator.UNABLE_TO_FIND_ROOT_PROJECT_MESSAGE, e.getMessage());
    }

    @Test
    void testRootDirectory() {
        assertActivation(false, newExistsProfile("${project.rootDirectory}/someFile.txt"), context);