*            <code>null</code>.
     * @param parent The (read-only) parent model from which to inherit the values, may be <code>null</code>.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */

      assertTrue(item + " must not be Object#equals to null", !item.equals(null));
      assertTrue(
          item + " must not be Object#equals to an arbitrary object of another class",
          !item.equals(NotAnInstance.EQUAL_TO_NOTHING));
      assertTrue(item + " must be Object#equals to itself", item.equals(item));
      assertEquals(
          "the Object#hashCode of " + item + " must be consistent",
          item.hashCode(),

    if (x <= 0) {
      throw new IllegalArgumentException(role + " (" + x + ") must be > 0");
    }
    return x;
  }

  @CanIgnoreReturnValue
  static long checkPositive(String role, long x) {
    if (x <= 0) {
      throw new IllegalArgumentException(role + " (" + x + ") must be > 0");
    }
    return x;
  }

  @CanIgnoreReturnValue

     *
     * @param groupId The group id of the cache record, must not be {@code null}.
     * @param artifactId The artifact id of the cache record, must not be {@code null}.
     * @param version The version of the cache record, must not be {@code null}.
     * @param tag The tag of the cache record, must not be {@code null}.
     * @param data The data to store in the cache, must not be {@code null}.
     */

     * does not actually resolve the artifact files.
     *
     * @param session the {@link Session}, must not be {@code null}
     * @param root the Maven Dependency, must not be {@code null}
     * @param scope the {link PathScope} to collect dependencies, must not be {@code null}
     * @return the collection result, never {@code null}

    /**
     * Builds a project descriptor from the specified POM file.
     *
     * @param projectFile The POM file to build the project from, must not be {@code null}.
     * @param request The project building request that holds further parameters, must not be {@code null}.
     * @return The result of the project building, never {@code null}.

  /**
   * Returns the stripe at the specified index. Valid indexes are 0, inclusively, to {@code size()},
   * exclusively.
   *
   * @param index the index of the stripe to return; must be in {@code [0...size())}
   * @return the stripe at the specified index
   */
  public abstract L getAt(int index);

  /**

// keep.

// `value` must point to a string of length `length` bytes.
TF_CAPI_EXPORT extern void TF_SetAttrString(TF_OperationDescription* desc,
                                            const char* attr_name,
                                            const void* value, size_t length);
// `values` and `lengths` each must have lengths `num_values`.
// `values[i]` must point to a string of length `lengths[i]` bytes.

     *
     * @param model The model whose duplicate elements should be merged, must not be {@code null}.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */

        assertContains(result.getWarnings().get(1), "'pluginRepositories.pluginRepository.id' must not be 'local'");
        assertContains(result.getWarnings().get(2), "'distributionManagement.repository.id' must not be 'local'");
        assertContains(
                result.getWarnings().get(3), "'distributionManagement.snapshotRepository.id' must not be 'local'");
    }

    @Test