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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

## Finding the issue

The first step of 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 of 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

Targeted Properties

Stateful Properties

Case Study: Bookstore

State Machine Properties

Conclusion

Adjusting the Model: Fixing the Issue

Finding the issue