RSPEC expectation

Question 1

How to check values on true/false? ( 2 way )

Answer 1

# passes if actual is truthy (not nil or false)
expect(actual).to be_truthy 
# passes if actual == true
expect(actual).to be true  

 # passes if actual is falsy (nil or false)
expect(actual).to be_falsey 
# passes if actual == false
expect(actual).to be false

Question 2

How to check the attributes of the object?

Answer 2

expect(actual_object).to have_attributes(name: 'Nic', age:12)
# or the alias
expect(actual_object).to has_attributes(name: 'Nic', age:12)

Question 3

How to check object attributes value of another object?

Answer 3

use an_object_having_attributes

let(:task) { Task.new(size: 2) }
let(:project) { Project.new(task: task) }

it 'checks object attributes' do
  expect(project).to have_attributes(task: an_object_having_attributes(size: 2))
end

Question 4

How to check array values?

Answer 4

expect([1,2,3]).to match([1,2,3]) # exactly the same with correct order
expect([1,2,3]).to contain_exactly(3, 2, 1) # exactly the same without order

Question 5

How to check error raising?

Answer 5

expect {
subject # or any other action
}.to raise_error(NotFoundError)

Question 6

How to check hash values?

Answer 6

expect(hash).to a_hash_including(‘employee_minimum’ => 1)

Question 7

How to check that hash include a key?

Answer 7

expect(hash).to have_key(:key)