Sidekiq Tests Failing? Fix Connection Pool 3.0.1 Issues!

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Sidekiq Tests Failing? Fix Connection Pool 3.0.1 Issues!This is a deep dive into solving a frustrating `ArgumentError: unknown keyword: :name` that pops up when your *Sidekiq tests* encounter `connection_pool` version 3.0.1. If you're using the *New Relic Ruby Agent* and suddenly your CI/CD pipeline is red, don't sweat it, you're in the right place! We'll break down why this happens and give you solid strategies to get those tests passing again, ensuring your background jobs run smoothly and your monitoring stays on point. We’re talking about a common dependency headache that many Ruby developers face, especially when major version bumps introduce subtle, yet critical, API changes. Understanding the interaction between Sidekiq's Redis connection management and `connection_pool`'s updated interface is key here, and we'll walk through it step-by-step. Get ready to troubleshoot like a pro and squash those errors for good, maintaining a robust testing environment for your critical background processing.## The Core Problem: Sidekiq, Connection Pool 3.0.1, and the `ArgumentError`So, guys, let's talk about this pesky error: `ArgumentError: unknown keyword: :name`. This particular issue rears its head when you're running your *Sidekiq tests* and have recently updated your `connection_pool` gem to version 3.0.1 or higher. The stack trace clearly points the finger at `/opt/hostedtoolcache/Ruby/3.4.4/x64/lib/ruby/gems/3.4.0/gems/connection_pool-3.0.1/lib/connection_pool.rb:48:in 'initialize'`, which is the very constructor for the `ConnectionPool` class itself. This is a critical piece of information because it tells us that the way `connection_pool` is being initialized has changed significantly in its latest major version.Historically, `connection_pool` allowed, or perhaps even expected, a `:name` keyword argument when creating a new pool, which could be useful for identifying different pools within an application. However, with version 3.0.1, it seems this argument is no longer recognized or supported, leading to the `ArgumentError`.The problem becomes apparent when Sidekiq, which heavily relies on `connection_pool` for managing its Redis connections, tries to set up a pool using its standard configuration. The stack trace shows `Sidekiq::RedisConnection.create` calling `Class#new` on `ConnectionPool`, which then triggers the error. This means Sidekiq's internal mechanism for creating a Redis connection pool is passing an argument that the *new* `connection_pool` gem doesn't understand. Specifically, you can see `Sidekiq::Config#new_redis_pool`, `Sidekiq::Config#local_redis_pool`, and `Sidekiq::Config#redis_pool` all in the call chain, indicating that this is deeply embedded in how Sidekiq manages its Redis resources.Our context, specifically the `SidekiqArgsFiltrationTest#test_excluded_args_are_not_captured` test, indicates that this error happens during the setup or execution of tests involving Sidekiq jobs. The *New Relic Ruby Agent* often instruments these interactions, but the error itself isn't coming from the agent's code directly, but rather from the underlying `connection_pool` gem. The agent is merely *exposing* an incompatibility that exists between Sidekiq's current implementation (likely pre-`connection_pool` 3.x compatibility) and the `connection_pool` gem's latest API. This distinction is important: the agent isn't *causing* the `ArgumentError`, but its comprehensive testing suite (which is fantastic for catching these kinds of dependency issues!) is revealing the problem. So, the primary suspect here isn't *New Relic* or even Sidekiq *per se*, but rather the semantic versioning change in `connection_pool` and how Sidekiq's existing code interacts with it. We need to figure out what exactly changed in `connection_pool`'s `initialize` method and how to align Sidekiq's usage with it.## Diving Deep into `Connection Pool` 3.0.1 ChangesAlright, let's get our hands dirty and figure out what went down with `connection_pool` version 3.0.1. For those who might not be super familiar, `connection_pool` is a super handy gem that provides a generic connection pool for concurrent usage. Think of it like this: when multiple parts of your application, or multiple threads, need to talk to an external service like Redis or a database, opening and closing connections all the time is slow and resource-intensive. A connection pool keeps a bunch of connections ready and waiting, handing them out when needed and recycling them when done. This is *crucial* for high-performance applications, which is why Sidekiq, a behemoth in background processing, relies on it so heavily for its Redis interactions.The jump from version 2.x to 3.x in any gem usually signifies a *major* change, and it’s almost always a good idea to pay close attention to the changelog. In the case of `connection_pool`, the `ArgumentError: unknown keyword: :name` strongly suggests a significant alteration in its `initialize` method. Based on common patterns in Ruby library development, there are a few likely scenarios for why `:name` is suddenly an