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

## Summary
We’ve covered what is pretty much an optimization when we have large counterexamples that PropEr doesn’t necessarily know how to handle. By using the `shrink` macro, we can let it know how to retarget shrinking toward more meaningful neutral values for a given generator. We've also seen that with `let_shrink`, we can give PropEr tips on how to divide up a data structure to find problems with more ease.

## What's next
Now that we know how to use shrinking, we now have pretty much all of the tools we'll need to handle stateless property tests.

# Summary
We’ve covered what is pretty much an optimization when we have large counterexamples that PropEr doesn’t necessarily know how to handle. By using the `shrink` macro, we can let it know how to retarget shrinking toward more meaningful neutral values for a given generator. We've also seen that with `let_shrink`, we can give PropEr tips on how to divide up a data structure to find problems with more ease.

# What's next
Now that we know how to use shrinking, we now have pretty much all of the tools we'll need to handle stateless property tests.

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

Stateful Properties

Case Study: Bookstore

State Machine Properties

Conclusion

Wrapping Up

Summary