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
In this chapter, we’ve seen multiple ways to come up with properties. We’ve been over modeling our system with simpler or alternative implementation and checking that they both work the same, and you’ve seen how example tests could be generalized to the point where their creation is automated. We’ve also looked at how multiple small invariants can be put together to make a test more solid, and finished up with some symmetric properties. For most properties, any of these four approaches should represent a decent starting point if we’re unsure how to get going.

# What's next
We’ll have plenty of chances to put these ideas into practice. But we'll soon see that some properties are hard to test with just the default generators. If we want to focus on behavior for a specific class of input, then very broad generators are not the best method. In the next chapter, we’ll see how to efficiently drill down into the data generation phase of properties, improving our tests with custom generators.

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