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
When it comes to writing properties, we’re now in a pretty good place. We should feel better about balancing properties with regular example-based unit tests, as we’ve seen for regression cases. Using example tests as an anchoring mechanism to backstop our properties can help make them a lot more trustworthy. In some cases, just exhaustively enumerating the whole data set is a possibility, letting us cover more than what properties would in the first place.

# What's next
Our experience of writing properties against a well-specified program is sure to prove useful, but property-based testing has another side to it. We can use properties to explore the design of our program itself, rather than just for testing a well-specified one. In the next chapter, we’ll do just that, by using them in properties-driven development.

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