Microcuke is a tiny Cucumber implementation in 500 SLOC, based on Gherkin3. It's got 100% unit test coverage.
The sole purpose of microcuke is to provide a very simple reference implementation that can be ported to a new programming language in a few days. Think of it as an aid to developers who wish to implement Cucumber for a new programming language.
Microcuke is written in classic JavaScript (ES5), because that's a language most programmers can at least read. The source code is not heavily documented - we aim to write self-explanatory, simple code instead. If you find something hard to understand, that's a bug! Feel free to open a bug report.
Most of Microcuke is written in synchronous JavaScript (for readability), but there are some parts that are asynchronous (using promises and callbacks). These constructs are fairly JavaScript-specific, so if you are using microcuke as a guid to write a Cucumber implementation for a new language, you should probably translate that code to simple synchronous code.
Here is a high level class diagram to give you an idea:
First, you need to install Node.js. Once you've done that you must install the libraries that microcuke depends on.
npm install
Now let's take it for a spin:
./bin/cucumber
This will run the features under the features directory.