RSpec-MultipleMemoizedHelpers.md

Pattern: Too many memoized helpers

Issue: -

Description

Checks if example groups contain too many let and subject calls.

This rule is configurable using the Max option and the AllowSubject which will configure the rule to only register offenses on calls to let and not calls to subject.

Examples

# bad
describe MyClass do
  let(:foo) { [] }
  let(:bar) { [] }
  let!(:baz) { [] }
  let(:qux) { [] }
  let(:quux) { [] }
  let(:quuz) { {} }
end

describe MyClass do
  let(:foo) { [] }
  let(:bar) { [] }
  let!(:baz) { [] }

  context 'when stuff' do
    let(:qux) { [] }
    let(:quux) { [] }
    let(:quuz) { {} }
  end
end

# good
describe MyClass do
  let(:bar) { [] }
  let!(:baz) { [] }
  let(:qux) { [] }
  let(:quux) { [] }
  let(:quuz) { {} }
end

describe MyClass do
  context 'when stuff' do
    let(:foo) { [] }
    let(:bar) { [] }
    let!(:booger) { [] }
  end

  context 'when other stuff' do
    let(:qux) { [] }
    let(:quux) { [] }
    let(:quuz) { {} }
  end
end

when disabling AllowSubject configuration

# rubocop.yml
# RSpec/MultipleMemoizedHelpers:
#   AllowSubject: false

# bad - `subject` counts towards memoized helpers
describe MyClass do
  subject { {} }
  let(:foo) { [] }
  let(:bar) { [] }
  let!(:baz) { [] }
  let(:qux) { [] }
  let(:quux) { [] }
end

with Max configuration

# rubocop.yml
# RSpec/MultipleMemoizedHelpers:
#   Max: 1

# bad
describe MyClass do
  let(:foo) { [] }
  let(:bar) { [] }
end

Configurable attributes

Name	Default value	Configurable values
AllowSubject	true	Boolean
Max	5	Integer

Further Reading

• RSpec - RSpec/MultipleMemoizedHelpers