The failing test is automatically created by the `lein` default template when you create a new project.

```bash
lein new my-project
```

This is because  one of the TDD/BDD best practices is to start any project from a failing test. The default `lein` template creates a failing test as a placeholder reminding you that you have to code unit tests too. 

In the context of the OpenCV/CLJ tutorial the `simple-sample` project has been created to habilitate the REPL only with anything you need to start interactively learning OpenCV mechanics. 

At the moment I prefer to leave as it is, otherwise I should explain topics which are faraway from the goal of the tutorial. 

Thanks