Gain insights into property-based testing with PropEr in Elixir. Learn foundational principles, custom data generators, and advanced concepts for effective real-world application testing.

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Property-based testing relies on specifying some property of code, unlike unit tests, which specify the expected output in response to some inputs. In this course, we'll cover the concepts we need to feel confident about using even the most advanced features of PropEr with Elixir.

We'll start with the basic and foundational principles of property-based testing, see what the framework offers us to get started, make our way through thinking in properties, write our own custom data generators, and then learn more advanced concepts. We'll also see how you can use property-based testing in a realistic project.

By the time we finish this course, we should feel comfortable testing real-world applications using properties.

Property-Based Testing with PropEr in Elixir

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.

Learn about 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

Stateful Properties

Case Study: Bookstore

State Machine Properties

Conclusion

Fancy Custom Generators