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’ve covered what is pretty much an optimization when we have large counterexamples that PropEr doesn’t necessarily know how to handle. By using the `?SHRINK` macro, we can let it know how to retarget shrinking toward more meaningful neutral values for a given generator. We’ve also seen that with `?LETSHRINK`, we can give PropEr tips on how to divide up a data structure to find problems with more ease.

# What's next
Now that we’ve gone over shrinking, we now have pretty much all of the tools we'll need to handle stateless property tests. In fact, we’re almost done with stateless properties. Right now, the only thing left to see is a brand new PropEr feature called **targeted property-based testing**, which at this point will just be a bonus for some amazing flexibility in property testing.

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