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# frozen_string_literal: true
# The calling spec should use `:use_clean_rails_memory_store_caching`
# when including this shared example. E.g.:
#
# describe MyCountService, :use_clean_rails_memory_store_caching do
# it_behaves_like 'a counter caching service with threshold'
# end
RSpec.shared_examples 'a counter caching service with threshold' do
let(:cache_key) { subject.cache_key }
let(:under_threshold) { described_class::CACHED_COUNT_THRESHOLD - 1 }
let(:over_threshold) { described_class::CACHED_COUNT_THRESHOLD + 1 }
context 'when cache is empty' do
before do
Rails.cache.delete(cache_key)
end
it 'refreshes cache if value over threshold' do
allow(subject).to receive(:uncached_count).and_return(over_threshold)
expect(subject.count).to eq(over_threshold)
expect(Rails.cache.read(cache_key)).to eq(over_threshold)
end
it 'does not refresh cache if value under threshold' do
allow(subject).to receive(:uncached_count).and_return(under_threshold)
expect(subject.count).to eq(under_threshold)
expect(Rails.cache.read(cache_key)).to be_nil
end
end
context 'when cached count is under the threshold value' do
before do
Rails.cache.write(cache_key, under_threshold)
end
it 'does not refresh cache' do
expect(Rails.cache).not_to receive(:write)
expect(subject.count).to eq(under_threshold)
end
end
context 'when cached count is over the threshold value' do
before do
Rails.cache.write(cache_key, over_threshold)
end
it 'does not refresh cache' do
expect(Rails.cache).not_to receive(:write)
expect(subject.count).to eq(over_threshold)
end
end
end
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