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

## Finding the issue

The first step in determining any stateful failure is to figure out which failing sequence caused the problem. Shrinking does most of the job, but we still have to extract meaning out of it. We have something similar to the following:


# Finding the issue

The first step in determining any stateful failure is to figure out which failing sequence caused the problem. Shrinking does most of the job, but we still have to extract meaning out of it. We have something similar to the following:


Take a look at what causes the tests to fail, and how to resolve the issue.

Adjusting the Model: Fixing the Issue

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

Adjusting the Model: Fixing the Issue

Finding the issue