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 final chapter, you’ve seen how to bring stateful properties to the next level in cases where the system under test can be modeled as a finite state machine. In such cases, FSM properties represent a useful specialization mechanism that lets you generate calls and data according to the state in which the system should be. We’ve been through the data generation model (both symbolic and real) for the property and have put it all in practice through tests for Klarna’s `circuit_breaker` library. We came up with a multistate model, which proved to be ill-fitting for the actual library. We then went through the debugging steps required to fix the model and, through the statistics collected in the test execution, rebalanced the possible generated events to get better transition coverage.

# What's next

We now have all the knowledge required to use properties to find tricky bugs in all kinds of systems, from basic unit tests to larger integration suites. You’re ready to go on and start adding better tests to your software, which will improve your software as a whole. Enjoy!

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