Gain insights into property-based testing with PropEr in Erlang. Delve into foundational principles, common frameworks, custom data generators, and applying testing in realistic projects for robust code validation.

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Property-based testing relies on specifying some property of code, rather than unit tests which specify the expected output in response to some inputs. In this course, you’ll cover the concepts you need to get started, up to the point where you feel confident enough to use the most advanced features of PropEr with Erlang.

You’ll start smoothly with the basic and foundational principles of property-based testing. From there, you will cover some of the common frameworks, how to think in properties, how to write your own custom data generators, and more. You'll also see how you can use Property-Based Testing in a realistic project.

By the time you finish this course, you will be comfortable testing real-world applications using properties.

Property-Based Testing with PropEr in Erlang

# Summary
Through properties-driven development, we’ve extrapolated properties from a vague spec and tested our happy-paths in a test-first approach. While a useful metric to show whether code has been tested, code coverage isn’t great to assess test quality. We’ve learned how to compensate using negative testing in a fuzzing-inspired approach, as well as how playing with properties by relaxing constraints can uncover all kinds of bugs and under specifications that could prove problematic.


# What's next
We’ve done all this while learning about the most complex generators this course contains. We should now have a pretty good idea of what can and can’t be done well with stateless properties. Go ahead and utilize what we’ve learned in your own projects. As you encounter trickier generators, you might still find them hard to debug. But the next chapter should have you covered, where we’re going to be learning about shrinking. 

Here's a summary of what we learned in this chapter.

Wrapping Up

Foundations of Property-Based Testing

Writing Properties

Thinking in Properties

Custom Generators

Responsible Testing

Properties-Driven Development

Shrinking

Targeted Properties

Stateful Properties

Case Study: Bookstore

State Machine Properties

Conclusion

Wrapping Up

Summary