| `es-module` | Yes | Test ESM module loading. |

| `fixtures` | | Test fixtures used in various tests throughout the test suite. |

| `internet` | No | Tests that make real outbound network connections. Tests for networking related modules may also be present in other directories, but those tests do not make outbound connections. |

| `js-native-api` | Yes | Tests for Node.js-agnostic [Node-API](https://nodejs.org/api/n-api.html) functionality. |

| `known_issues` | Yes | Tests reproducing known issues within the system. All tests inside of this directory are expected to fail. If a test doesn't fail on certain platforms, those should be skipped via `known_issues.status`. |

| `message` | Yes | Tests for messages that are output for various conditions (`console.log`, error messages etc.) |

| `node-api` | Yes | Tests for Node.js-specific [Node-API](https://nodejs.org/api/n-api.html) functionality. |

| `parallel` | Yes | Various tests that are able to be run in parallel. |

| `pseudo-tty` | Yes | Tests that require stdin/stdout/stderr to be a TTY. |

| `pummel` | No | Various tests for various modules / system functionality operating under load. |