How To Run Ruby Rspec Tests

Testing is a crucial part of software development, allowing developers to catch errors and bugs before they make their way into production. In Ruby, one popular testing framework is RSpec. In this blog post, we’ll go over how to run Ruby RSpec tests and understand the output.

Step 1: Install RSpec

Before we can write and run RSpec tests, we need to ensure RSpec is installed. To install RSpec, run the following command in your terminal:

gem install rspec

Once RSpec is installed, you can verify the installation by running:

rspec --version

This should display the installed version of RSpec.

Step 2: Set Up RSpec in Your Project

To set up RSpec in your project, navigate to your project directory and run:

rspec --init

This command will generate a .rspec file and a spec directory, with a spec_helper.rb file inside it. The spec_helper.rb file is where you can configure RSpec settings for your project.

Step 3: Write Your RSpec Tests

Create a new file inside the spec directory with a name that reflects the functionality you are testing, followed by _spec.rb. For example, if you are testing a class called Calculator, you might create a file named calculator_spec.rb.

In this file, you can write your RSpec tests using the describe, context, and it blocks. Here’s an example of a simple test for a Calculator class:

    require 'calculator'

    describe Calculator do
      context "#add" do
        it "returns the sum of two numbers" do
          calculator =
          expect(calculator.add(2, 3)).to eq(5)

Step 4: Run Your RSpec Tests

To run your RSpec tests, simply run the rspec command in your terminal:


By default, RSpec will look for test files in the spec directory and execute them.

Understanding the RSpec Output

When you run your RSpec tests, the output will show the number of examples (tests) run, the number of failures, and the number of pending tests. A green dot (.) represents a passing test, while a red F indicates a failing test.

For each failing test, RSpec will provide a detailed error message, showing the expected result and the actual result. This can help you diagnose the issue and fix the test or the code you’re testing.


In this blog post, we’ve covered how to set up, write, and run RSpec tests for your Ruby projects. By incorporating RSpec into your development process, you can help ensure your code is robust and free of errors.