RSpec Tutorial

When you run your tests with RSpec, the output should be similar to this: 'rspec tutorial'

If you want to see one failing test at a time, simply add `-fail-fast` or `-f-f` to your command. A pro-tip is that as you start working with larger test suites, it can become overwhelming to run your tests and see dozens of failing examples. To overcome this, you can run specific test files like `rspec spec/descending_order_spec.rb`. Run the test by typing `rspec` into your terminal.

When running RSpec, it will look in your `spec` folder for any `_spec.rb` files and run those. Whenever you create a file to write tests in, it must be located in the `spec` folder and follow this convention: `_spec.rb`. Now, in your `spec` directory, create a `descending_order_spec.rb` file.

Next, create a `descending_order.rb` file where we'll code our solution. Our task is to make a function that can take any non-negative integer as an argument and return it with its digits in descending order. This challenge is called Descending Order, and it's a great opportunity to learn how to write tests using RSpec.

To start, install RSpec by running `gem install rspec` from your project directory. Then, create a new file structure by creating a `rspec` file in your project directory, and a `spec` folder with a `spec_helper.rb` file inside it.

Now that we have our files set up, let's start writing our tests using RSpec. With a little practice, writing tests is actually fun. Testing can be intimidating, especially for beginners, but it really doesn't have to be that way.

Rspec tutorial