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
We now have all the tools we need to make the fanciest generator imaginable. We’re ready to make generators with a wide-spectrum approach to fuzz our systems as well as more narrowed and accurate generators that exercise specific invariants to our code. All of these methods can be mixed together. Nothing should stop us from using symbolic calls with some terms created probabilistically with a dynamic size that are created through complex recursive generators that filter with `?SUCHTHAT` and transform with `?LET`.

# What's next

We still need to find strategies to make proper use of properties within a project. The next chapter will cover responsible testing, how to know when enough is enough, or where a little property-testing magic can go a long way.

Here's a summary of what we've 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