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# Node.js Core Tests
This directory contains code and data used to test the Node.js implementation.
For a detailed guide on how to write tests in this
directory, see [the guide on writing tests](../doc/guides/writing-tests.md).
On how to run tests in this directory, see
[the contributing guide](../CONTRIBUTING.md#step-6-test).
## Test Directories
|Directory |Runs on CI |Purpose |
|-------------------|---------------|---------------|
|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.|
|cctest |Yes |C++ test that is run as part of the build process.|
|common | |Common modules shared among many tests. [Documentation](./common/README.md)|
|es-module |Yes |Test ESM module loading.|
|fixtures | |Test fixtures used in various tests throughout the test suite.|
|gc |No |Tests for garbage collection related functionality.|
|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.|
|timers |No |Tests for [timing utilities](https://nodejs.org/api/timers.html) (```setTimeout``` and ```setInterval```).|
_When a new test directory is added, make sure to update the `CI_JS_SUITES`
variable in the `Makefile` and the `js_test_suites` variable in
`vcbuild.bat`._
|
