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Project: Rspec-role-mocks

Publisher: treppo

Mocking roles, not objects

Background
Given
a file named "spec/roles/notifier.rb" with: 
RSpec.define_role 'Notifier' do
  def notify(message); end
end
And
a file named "spec/spec_helper.rb" with: 
require 'rspec/role-mocks'

$LOAD_PATH.unshift("lib")
And
a file named "spec/user_spec.rb" with: 
require 'spec_helper'
require 'user'
require 'roles/notifier'

RSpec.describe User, '#suspend!' do
  it 'notifies the console' do
    notifier = role_double("Notifier")

    expect(notifier).to receive(:notify).with("suspended")

    user = User.new(notifier)
    user.suspend!
  end
end
Scenarios
  1. spec passes with method defined
  2. spec fails with method not called
  3. spec fails with method not defined
  4. spec fails with incorrect arity
  5. spec fails with incorrect argument
spec passes with method defined
Given
a file named "lib/user.rb" with: 
class User < Struct.new(:notifier)
  def suspend!
    notifier.notify("suspended")
  end
end
When
I run rspec spec/user_spec.rb
Then
the examples should all pass
spec fails with method not called
Given
a file named "lib/user.rb" with: 
class User < Struct.new(:notifier)
  def suspend!
  end
end
When
I run rspec spec/user_spec.rb
Then
the example should fail
And
the output should contain "expected method call to #notify on role double Notifier was never made"
spec fails with method not defined
Given
a file named "lib/user.rb" with: 
class User < Struct.new(:notifier)
  def suspend!
    notifier.notify("suspended")
    notifier.call
  end
end
When
I run rspec spec/user_spec.rb
Then
the example should fail
And
the output should contain "role double Notifier does not implement: #call"
spec fails with incorrect arity
Given
a file named "lib/user.rb" with: 
class User < Struct.new(:notifier)
  def suspend!
    notifier.notify
  end
end
When
I run rspec spec/user_spec.rb
Then
the output should contain "1 example, 1 failure"
And
the output should contain "Wrong number of arguments for #notify on role double Notifier"
And
the output should contain "Actual: 0"
And
the output should contain "Expected: 1"
spec fails with incorrect argument
Given
a file named "lib/user.rb" with: 
class User < Struct.new(:notifier)
  def suspend!
    notifier.notify('not_suspend')
  end
end
When
I run rspec spec/user_spec.rb
Then
the output should contain "1 example, 1 failure"
And
the output should contain: 
Method #notify on role double Notifier received wrong arguments: "not_suspend"
And
the output should contain: 
expected arguments: "suspended"

Last published about 5 years ago by treppo.