Looking for dependencies on test for a better UX

README.md

@@ -436,7 +436,6 @@ Upload these to a Gitea release. The script requires `build-essential`,
 `mingw-w64`, and `zip` as described above.
 
 ### Running the test suite
-
 ```bash
 cargo test
 ```
@@ -447,6 +446,28 @@ build-system issues like missing linker flags and include paths. They require
 cmake and a C++ compiler; if those tools are not installed, the compile tests
 skip gracefully and everything else still passes.
 
+#### Full test suite on Linux / WSL
+
+The e2e tests need `cmake`, `g++`, and `arduino-cli` with the AVR core:
+```bash
+sudo apt install cmake g++
+curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
+sudo mv bin/arduino-cli /usr/local/bin/
+arduino-cli core install arduino:avr
+```
+
+#### Full test suite on Windows
+
+Install [arduino-cli](https://arduino.github.io/arduino-cli/installation/)
+and add it to your PATH, then install the AVR core:
+```
+arduino-cli core install arduino:avr
+```
+
+CMake and a C++ compiler are needed for the host-side test compilation.
+Install [CMake](https://cmake.org/download/) and either MinGW-w64 or open
+a Visual Studio Developer Command Prompt (which provides `cl.exe`).
+
 ---
 
 ## License