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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::ProcessMemoryCache::Helper, :use_clean_rails_memory_store_caching do
let(:minimal_test_class) do
Class.new do
include Gitlab::ProcessMemoryCache::Helper
def cached_content
fetch_memory_cache(:cached_content_instance_key) { expensive_computation }
end
def clear_cached_content
invalidate_memory_cache(:cached_content_instance_key)
end
end
end
before do
stub_const("MinimalTestClass", minimal_test_class)
end
subject { MinimalTestClass.new }
describe '.fetch_memory_cache' do
it 'memoizes the result' do
is_expected.to receive(:expensive_computation).once.and_return(1)
2.times do
expect(subject.cached_content).to eq(1)
end
end
it 'resets the cache when the shared key is missing', :aggregate_failures do
allow(Rails.cache).to receive(:read).with(:cached_content_instance_key).and_return(nil)
is_expected.to receive(:expensive_computation).thrice.and_return(1, 2, 3)
3.times do |index|
expect(subject.cached_content).to eq(index + 1)
end
end
it 'does not set the shared timestamp if it is already present', :redis do
subject.clear_cached_content
is_expected.to receive(:expensive_computation).once.and_return(1)
expect { subject.cached_content }.not_to change { Rails.cache.read(:cached_content_instance_key) }
end
end
describe '.invalidate_memory_cache' do
it 'invalidates the cache' do
is_expected.to receive(:expensive_computation).twice.and_return(1, 2)
expect { subject.clear_cached_content }.to change { subject.cached_content }
end
end
end
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