... in this specific context. 'Reality testing' is a common term in academic and popular psychology, and it means (more academically) verifying that your ideas of the world correspond to reality or (more popularly) trying something to see whether it is possible. A simple example of the latter, close to the sense of your text, would be intentionally lighting a cigarette in a restaurant with a prominently posted 'No Smoking' sign to see whether the prohibition is actually enforced, or driving through a construction zone marked 60 kph at 100 kph to see whether you get a fine. A less 'reckless' example of reality testing is testing a new idea (such as an advertising campaign concept or an electronic circuit design) to see whether it actually works
In your context, 'reckless reality testing' means intentionally challenging the perceived rules, restrictions, mores and norms with little regard for the possible negative consequences.