RSpec RSpec is a testing framework. It’s what allows you to write and run your tests.An analogous tool would be MiniTest. In my experience, most commercial Rails projects use RSpec and most open-source Ruby projects use MiniTest. At any Rails job you’re more likely to be using RSpec than MiniTest. (I’m not sure why this is the way it is.) Capybara Some Rails tests operate at a “low level”, meaning no browser interaction is involved. Other “high level” tests do actually spin up a browser and click links, fill out form fields, etc.Low-level tests can be executed with just RSpec and nothing more. But for tests that use the browser, something more is needed.This is where Capybara comes into the picture. Capybara provides helper methods like fill_in to fill in a form field, click_on to click a button, etc.Please note that Capybara does NOT have to be used in conjunction with Cucumber. It’s completely possible to write integration tests in Rails with just RSpec and Capybara.

Cucumber

Cucumber is a tool for writing test cases in something close to English. Here’s an example:

Scenario: Eric wants to withdraw money from his bank account at an ATM
    Given Eric has a valid Credit or Debit card
    And his account balance is $100
    When he inserts his card
    And withdraws $45
    Then the ATM should return $45
    And his account balance is $55

Cucumber can be connected with RSpec and Capybara and used to write integration tests.

My personal take on Cucumber is that while the English-like syntax might appear clearer at first glance, it’s actually less clear than bare RSpec/Capybara syntax. (Would a Ruby class be more understandable if it were English instead of Ruby?)

Cucumber adds both a layer of mental overhead and a layer of maintenance overhead on top of the RSpec + Capybara combination.

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