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Jonathan Hui 523f5015bc [docs] update GEMINI.md with Nexus test instructions (#12542 )

This commit updates GEMINI.md to include instructions for building and
running Nexus tests. Nexus is a test framework that enables faster and
more scalable network simulations within a single process.

The updated documentation provides:
- A brief overview of the Nexus test framework.
- The command to build Nexus tests using 'tests/nexus/build.sh'.
- Commands to run all Nexus tests or a specific test using
  'tests/nexus/run_nexus_tests.sh'.
- A reference to 'tests/nexus/README.md' for further details.

2026-02-24 15:38:44 -06:00

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OpenThread (`openthread`) GEMINI.md

Project Overview

OpenThread is an open-source implementation of the Thread networking protocol, released by Google. It is designed to be OS and platform-agnostic, with a small memory footprint, making it highly portable. It supports both system-on-chip (SoC) and network co-processor (NCP) designs and is a Thread Certified Component.

The project is primarily written in C and C++, with Python used for scripting and tooling. It uses a variety of build systems, including CMake and GN, and is actively maintained with a strong emphasis on code quality and style, enforced through continuous integration.

Building and Running

The project uses both CMake and GN as build systems. A collection of scripts in the script/ directory simplifies the build and test process.

Prerequisites

Compilers: gcc and clang
Build tools: make, ninja-build
Other tools: python3, yapf (v0.43.0), clang-format (v19), pylint, shellcheck, iwyu

A bootstrap script is provided to install the required tools:

./script/bootstrap

Building with CMake

The project provides CMake presets for easier configuration.

Configure:

cmake --preset simulation

Build:

cmake --build --preset simulation

Building with Scripts

The script/ directory contains several scripts for building the project for different configurations:

Simulation Build:
```
script/check-simulation-build
```
POSIX Build:
```
script/check-posix-build
```
ARM Build:
```
script/check-arm-build
```
GN Build:
```
script/check-gn-build
```

Testing

The project uses CTest for testing.

To run the tests after building with the simulation preset:

ctest --preset simulation

Nexus Tests

Nexus is a test framework that allows simulating multiple OpenThread nodes within a single process, enabling faster and more scalable network simulations.

Build Nexus tests:

top_builddir=nexus_test ./tests/nexus/build.sh

Run all Nexus tests:

top_builddir=nexus_test ./tests/nexus/run_nexus_tests.sh

Run a specific Nexus test:

top_builddir=nexus_test ./tests/nexus/run_nexus_tests.sh <test_name>

For more details, see tests/nexus/README.md.

Development Conventions

Code Style

The project has a strict coding style, which is enforced by the script/make-pretty script. Before submitting a pull request, ensure your code is formatted correctly.

Check code style:

script/make-pretty check

Format code:

script/make-pretty

Key style points:

Indentation: 4 spaces.
Naming:
- UpperCamelCase for types (classes, structs, enums), methods, functions.
- lowerCamelCase for variables.
- g prefix for globals, s for statics, m for members, a for arguments.
Comments: Doxygen is used for API documentation.

For more details, see the STYLE_GUIDE.md.

Commits and Pull Requests

The project follows the "Fork-and-Pull" model. All contributions must be accompanied by a Contributor License Agreement (CLA). Pull requests are tested using GitHub Actions, and all checks must pass before merging.

For more details, see the CONTRIBUTING.md.

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OpenThread (openthread) GEMINI.md