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wire 2026-06-15
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RAILS DROPS KARMA FOR WEB TEST RUNNER, FIXES ACTION CABLE CI

By RepoJournal · Filed · About Rails · Composed from the cited sources · methodology

matthewd
1 person shipped this
matthewd @matthewd 2 cited

Rails is ditching deprecated Karma and moving Action Cable tests to Web Test Runner, while fixing a critical logging gap in Active Job events.

The Rails core team completed the migration away from Karma, the deprecated JavaScript test runner, by switching Action Cable's QUnit suite to Web Test Runner [1]. Karma hasn't accepted new features or bug fixes for months, and Web Test Runner provides a maintained Sauce launcher that keeps browser testing on supported tooling. Alongside this shift, the buildkite-config landed adjustments to stabilize Action Cable integration testing [2], installing iproute2 for Sauce browser sessions and treating exit code 3 as retryable before soft-failing, reducing noise in CI. On the framework side, Active Job's StructuredEventSubscriber now includes the adapter key in perform_start event payloads [3], matching every sibling event and fixing LogSubscriber output that expects adapter data to format queue information. Rails also fixed an edge case where remove_column migrations without a type argument are now properly marked irreversible [4], preventing silent rollback failures.

$ ls rails/reviews/ # the step-back reads

the week in review Ractor-ready Active Record and Active Job land in Rails the month in review Herb becomes Rails 8.2 default
Full archive → Weekly reviews →

Quick answers

What shipped in Rails on June 15, 2026?
Rails is ditching deprecated Karma and moving Action Cable tests to Web Test Runner, while fixing a critical logging gap in Active Job events. In total, 30 commits and 17 pull requests landed.
Who contributed to Rails on June 15, 2026?
1 developer shipped this update, including matthewd.
What were the notable Rails updates?
Run Action Cable JS tests with Web Test Runner, Action Cable integration testing tweaks, and Include adapter in Active Job perform_start event payload.
♥

$ log @rails --recent

Attribute-read regression fixed, decimal numericality corrected 79 shipped in_order_of double-serializes values, id_value alias restored 50 shipped Inlined attribute writers, leaner ActiveRecord::Key 31 shipped MySQL 5.6 falls off the support floor as Arel stops rebuilding literals 27 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training verl standardizes low-precision rollout kernels on DeepGEMM Agent Security Guardrails exposes hooks over HTTP, certifi floor raised in agent-scan

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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