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

Now that we've looked at the techniques of basic custom generators, it's time we make things slightly more complicated and start learning how to work with fancy custom generators. 

# Purpose of fancy custom generators

We can get pretty far with basic custom generators, but there are cases where they won’t be enough to solve our problems. That is when we’ll require more advanced techniques in our custom generators. 

Let's take a look at how we can make use of the basic techniques to write recursive generators and symbolic calls.

Symbolic calls are a technique that makes the complex generators more understandable when the properties fail. 

# Recursive generators

Whenever a piece of data can be represented by a repetitive or well-ordered structure, or when a step-by-step approach can be used to create the data, recursion is our friend.

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In the next lesson let's look at how generator recursion works.

Get introduced to complex custom generators and the methods that are used to implement them.

Fancy Custom Generators

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

Fancy Custom Generators