RSpec describe and it blocks in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the describe block in RSpec?

The <code>describe</code> block groups related tests together. It usually wraps tests for a specific class or method, helping organize and explain what is being tested.

beginner

What does an it block represent in RSpec?

An it block defines a single example or test case. It describes a specific behavior or expectation that should be true.

beginner

How do describe and it blocks work together?

The describe block groups tests, and inside it, multiple it blocks define individual tests. This structure makes tests clear and organized.

beginner

Why should it block descriptions be written in plain language?

Writing it block descriptions in plain language helps anyone reading the tests understand what behavior is expected, making tests like documentation.

beginner

Example: What does this RSpec code test?<br>

describe 'Calculator' do
  it 'adds two numbers' do
    expect(1 + 2).to eq(3)
  end
end

This code tests that adding 1 and 2 results in 3. The describe block groups tests for 'Calculator', and the it block checks the addition behavior.

What is the main role of the describe block in RSpec?

A To group related tests

B To run a test

C To define a variable

D To skip a test

The describe block groups related tests together for better organization.

Which block in RSpec defines a single test case?

A it

B context

C describe

D before

The it block defines one example or test case.

Inside which block do you place multiple it blocks?

A it

B describe

C expect

D let

Multiple it blocks go inside a describe block.

What should the description inside an it block explain?

A The test framework version

B The file location

C The code implementation details

D The expected behavior being tested

The it description explains the expected behavior or outcome.

What does this code check?<br>

describe 'Array' do
  it 'is empty when created' do
    expect([].empty?).to be true
  end
end

A That an array has elements when created

B That an array is nil

C That an array is empty when created

D That an array raises an error

It checks that a new array is empty.

Explain how describe and it blocks help organize tests in RSpec.

Think about grouping and individual checks.

Write a simple RSpec test using describe and it blocks to check if 2 + 2 equals 4.

Use expect(2 + 2).to eq(4) inside it.