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

## Code

To run the shell, we’ll use the command `iex -S mix`. The shell will now start and we can test the functions that we created. To test the database functions in the shell we first have to compile the database module. For this, we will have to run the following two commands:

1. `ExUnit.start()`
2. `c "lib/bookstore/db.ex"`

After this, we can run the functions. 

Let's start off with a few basic functions:

1. `Bookstore.DB.setup()`
2. `Bookstore.DB.add_book("978-0-7546-7834-2", "Behind Human Error", "David D Woods")`
3. `Bookstore.DB.find_book_by_author("Woods")`
4. `Bookstore.DB.teardown()`

# Code

To run the shell, we’ll use the command `iex -S mix`. The shell will now start and we can test the functions that we created. To test the database functions in the shell we first have to compile the database module. For this, we will have to run the following two commands:

1. `ExUnit.start()`
2. `c "lib/bookstore/db.ex"`

After this, we can run the functions. 

Let's start off with a few basic functions:

1. `Bookstore.DB.setup()`
2. `Bookstore.DB.add_book("978-0-7546-7834-2", "Behind Human Error", "David D Woods")`
3. `Bookstore.DB.find_book_by_author("Woods")`
4. `Bookstore.DB.teardown()`

Take a look at how to start the application and test the functionality in the shell. 

The Application: Running the Code

Take a look at how to start the application and test the functionality in the shell.

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

The Application: Running the Code

Code