| `abort` | Yes | Tests for when the ``` --abort-on-uncaught-exception ``` flag is used. |
| `addons` | Yes | Tests for [addon](https://nodejs.org/api/addons.html) functionality along with some tests that require an addon to function properly. |
| `addons-napi` | Yes | Tests for [n-api](https://nodejs.org/api/n-api.html) functionality. |
| `async-hooks` | Yes | Tests for [async_hooks](https://nodejs.org/api/async_hooks.html) functionality. |
| `cctest` | Yes | C++ tests that are run as part of the build process. |
| `code-cache` | No | Tests for a Node.js binary compiled with V8 code cache. |
| `common` | | Common modules shared among many tests. [Documentation](./common/README.md) |
| `doctool` | Yes | Tests for the documentation generator. |
| `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 connections (mainly networking related modules). Tests for networking related modules may also be present in other directories, but those tests do not make outbound connections. |
| `known_issues` | Yes | Tests reproducing known issues within the system. All tests inside of this directory are expected to fail consistently. 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.) |
| `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. |
| `sequential` | Yes | Various tests that are run sequentially. |
| `testpy` | | Test configuration utility used by various test suites. |
| `tick-processor` | No | Tests for the V8 tick processor integration. The tests are for the logic in ```lib/internal/v8_prof_processor.js``` and ```lib/internal/v8_prof_polyfill.js```. The tests confirm that the profile processor packages the correct set of scripts from V8 and introduces the correct platform specific logic. |
| `v8-updates` | No | Tests for V8 performance integration. |