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# frozen_string_literal: true
require 'fast_spec_helper'
require 'rubocop'
require 'rubocop/rspec/support'
require_relative '../../../../rubocop/cop/gitlab/predicate_memoization'
RSpec.describe RuboCop::Cop::Gitlab::PredicateMemoization, type: :rubocop do
include CopHelper
subject(:cop) { described_class.new }
shared_examples('registering offense') do |options|
let(:offending_lines) { options[:offending_lines] }
it 'registers an offense when a predicate method is memoizing via ivar' do
inspect_source(source)
aggregate_failures do
expect(cop.offenses.size).to eq(offending_lines.size)
expect(cop.offenses.map(&:line)).to eq(offending_lines)
end
end
end
shared_examples('not registering offense') do
it 'does not register offenses' do
inspect_source(source)
expect(cop.offenses).to be_empty
end
end
context 'when source is a predicate method memoizing via ivar' do
it_behaves_like 'registering offense', offending_lines: [3] do
let(:source) do
<<~RUBY
class C
def really?
@really ||= true
end
end
RUBY
end
end
it_behaves_like 'registering offense', offending_lines: [4] do
let(:source) do
<<~RUBY
class C
def really?
value = true
@really ||= value
end
end
RUBY
end
end
end
context 'when source is a predicate method using ivar with assignment' do
it_behaves_like 'not registering offense' do
let(:source) do
<<~RUBY
class C
def really?
@really = true
end
end
RUBY
end
end
end
context 'when source is a predicate method using local with ||=' do
it_behaves_like 'not registering offense' do
let(:source) do
<<~RUBY
class C
def really?
really ||= true
end
end
RUBY
end
end
end
context 'when source is a regular method memoizing via ivar' do
it_behaves_like 'not registering offense' do
let(:source) do
<<~RUBY
class C
def really
@really ||= true
end
end
RUBY
end
end
end
end
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