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This course aims to teach you how to write better Rails applications by applying good testing practices. You’ll learn about the reasoning behind testing and the process of applying good testing practices. 

In the first half of the course, you’ll learn about the testing mindset and understand its importance. Next, you’ll learn to turn business requirements into user stories. These user stories will become the basis of the code and tests you’ll write.

Once you understand the reasoning and process, you’ll proceed to write the actual tests. You’ll test what is most important to the end user first. So, the first set of tests you’ll learn to write will be feature tests. Finally, you’ll learn to write request tests and unit tests ensuring end-to-end coverage of our application.

Bulletproof Ruby on Rails Applications

Programming is both an art and a science. It’s an art because we use creative thinking to assemble the pieces of a program, making it bigger and more complex.


There are many ways to build applications, but we need to ensure that they remain easy to change and maintain as they keep growing.

We don't want to worry that changes might take our whole application down. We need confidence that the code we ship is bug-free.

That type of confidence has everything to do with testing and code design.


## Why Rails applications fail
Most large Rails applications fail because of complexity, which grows exponentially with every feature we add.

The most common problems are coupling, size, and readability.


Programming is both an art and a science. It’s an art because we use creative thinking to assemble the pieces of a program, making it bigger and more complex.


There are many ways to build applications, but we need to ensure that they remain easy to change and maintain as they keep growing.

We don't want to worry that changes might take our whole application down. We need confidence that the code we ship is bug-free.

That type of confidence has everything to do with testing and code design.


# Why Rails applications fail
Most large Rails applications fail because of complexity, which grows exponentially with every feature we add.

The most common problems are coupling, size, and readability.


Let’s go over the motivation behind application testing.


Motivation

Let’s go over the motivation behind application testing.

Before We Start

The Why Behind Testing

The How Behind Testing

Planning

The Feature Layer

The Request Layer

The Unit Layer

Conclusion

Motivation

Why Rails applications fail