Rails default config uses the ActiveSupport::Cache::NullStore and
disables controller caching
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for all environments except production:
config.action_controller.perform_caching = false
config.cache_store = :null_store
If you want to test caching you have at least two possibilities:
- Enable caching for every test (not covered by this card and straightforward)
- Enable caching for individual test
Enable caching for individual test (file cache)
1. Leave the default configuration
2. Add a caching helper which gives you a unique file caching path for parallel tests:
module CachingHelpers
def file_caching_path
path = "tmp/test#{ENV['TEST_ENV_NUMBER']}/cache"
FileUtils::mkdir_p(path)
path
end
end
RSpec.configure do |config|
config.include CachingHelpers
end
3. Now stub the Rails cache and clear it before each example:
RSpec.describe SomeClass
let(:file_cache) { ActiveSupport::Cache.lookup_store(:file_store, file_caching_path) }
let(:cache) { Rails.cache }
before do
allow(Rails).to receive(:cache).and_return(file_cache)
Rails.cache.clear
end
it do
expect(cache.exist?('some_key')).to be(false)
cache.write('some_key', 'test')
expect(cache.exist?('some_key')).to be(true)
end
end
Enable caching for individual test (memory store)
1. Leave the default configuration
2. Now stub the Rails cache and clear it before each example:
RSpec.describe SomeClass
# memory store is per process and therefore no conflicts in parallel tests
let(:memory_store) { ActiveSupport::Cache.lookup_store(:memory_store) }
let(:cache) { Rails.cache }
before do
allow(Rails).to receive(:cache).and_return(memory_store)
Rails.cache.clear
end
it do
expect(cache.exist?('some_key')).to be(false)
cache.write('some_key', 'test')
expect(cache.exist?('some_key')).to be(true)
end
end
Posted by Emanuel to makandra dev (2017-06-27 10:14)