Is there a gem to test Redis logic in Rails? - ruby-on-rails

Question

Like Database cleaner, or the default clearing of the data store after a test run. I searched and couldn't find one. It could be either a separate test data store or just something simple that namespaces all Redis commands into a test namespace.
If anyone knows of any lemme know, otherwise I'll write one and OS it :)

Answer 1

When working with rails and redis I use a different redis db or namespace for the different environments. The setup is very simple and similar to ActiveRecords database config.
First, create a config: (namespace version commented out)
#config/redis.yml
default:
host: localhost
port: 6379
development:
db: 0
# namespace: appname_dev
test:
db: 1
# namespace: appname_test
production:
db: 2
host: 192.168.1.100
# namespace: appname_prod
Then load the config and connect to redis through an initializer:
#config/initializers/redis.rb
REDIS_CONFIG = YAML.load( File.open( Rails.root.join("config/redis.yml") ) ).symbolize_keys
dflt = REDIS_CONFIG[:default].symbolize_keys
cnfg = dflt.merge(REDIS_CONFIG[Rails.env.to_sym].symbolize_keys) if REDIS_CONFIG[Rails.env.to_sym]
$redis = Redis.new(cnfg)
#$redis_ns = Redis::Namespace.new(cnfg[:namespace], :redis => $redis) if cnfg[:namespace]
# To clear out the db before each test
$redis.flushdb if Rails.env == "test"
Remember to add 'redis-namespace' to your Gemfile if your using that version.

Answer 2

You can try fakeredis. It is an fake redis implementation written in pure ruby.

Answer 3

Oh, yes there is.
I use it in all of my projects where I need to test Redis logic.
it's very useful, and it's not on the same database as your local development so the data has no danger of being "mixed"
there it is: I put this code in my spec_helper.rb file, but you can put it in your test_helper.rb if you are using test unit.
# ==========================> Redis test configuration
REDIS_PID = "#{Rails.root}/tmp/pids/redis-test.pid"
REDIS_CACHE_PATH = "#{Rails.root}/tmp/cache/"
Dir.mkdir "#{Rails.root}/tmp/pids" unless Dir.exists? "#{Rails.root}/tmp/pids"
Dir.mkdir "#{Rails.root}/tmp/cache" unless Dir.exists? "#{Rails.root}/tmp/cache"
config.before(:suite) do
redis_options = {
"daemonize" => 'yes',
"pidfile" => REDIS_PID,
"port" => 9736,
"timeout" => 300,
"save 900" => 1,
"save 300" => 1,
"save 60" => 10000,
"dbfilename" => "dump.rdb",
"dir" => REDIS_CACHE_PATH,
"loglevel" => "debug",
"logfile" => "stdout",
"databases" => 16
}.map { |k, v| "#{k} #{v}" }.join('\n')
`echo '#{redis_options}' | redis-server -`
end
config.after(:suite) do
%x{
cat #{REDIS_PID} | xargs kill -QUIT
rm -f #{REDIS_CACHE_PATH}dump.rdb
}
end