RSpec-InstanceVariable.md

Pattern: Misused instance variable in spec

Issue: -

Description

Checks for instance variable usage in specs.

This rule can be configured with the option AssignmentOnly which will configure the rule to only register offenses on instance variable usage if the instance variable is also assigned within the spec

Examples

# bad
describe MyClass do
  before { @foo = [] }
  it { expect(@foo).to be_empty }
end

# good
describe MyClass do
  let(:foo) { [] }
  it { expect(foo).to be_empty }
end

with AssignmentOnly configuration

# rubocop.yml
# RSpec/InstanceVariable:
#   AssignmentOnly: false

# bad
describe MyClass do
  before { @foo = [] }
  it { expect(@foo).to be_empty }
end

# allowed
describe MyClass do
  it { expect(@foo).to be_empty }
end

# good
describe MyClass do
  let(:foo) { [] }
  it { expect(foo).to be_empty }
end

Configurable attributes

Name	Default value	Configurable values
AssignmentOnly	false	Boolean

Further Reading

• RSpec - RSpec/InstanceVariable
• http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/InstanceVariable