# Tutorial: rewriting the torsf experiment

This tutorial teaches you how to write a minimal implementation of the
[torsf](https://github.com/ooni/spec/blob/master/nettests/ts-030-torsf.md)
experiment. We will do that in four steps.

In the [first step](chapter01/) we will write a `main.go`
function that runs the existing `torsf` implementation.

In the [second step](chapter02/) we will modify the existing
code to launch an empty experiment instead.

In the [third step](chapter03/) we will start to fill in
the empty experiment to more closely simulate a real implementation
of the `torsf` experiment.

In the [fourth step](chapter04/) we will replace the code
simulating a real `torsf` experiment with a minimal implementation
of such an experiment that uses other code in `ooni/probe-cli` to
attempt to bootstrap `tor` over Snowflake.