Interprocess communication in Ruby can use UNIX sockets for parent-child coordination, parallel test synchronization, and waiting for child cleanup after fork.

Throttle headless Chrome network conditions in Selenium to debug flaky integration tests and simulate slow page loads.

Capybara step for asserting a meta refresh redirect in the page head during Cucumber feature tests.

Spring keeps bin/rails and bin/rspec fast, while parallel_tests can break shared test runs unless Spring is disabled in parallel contexts.

Custom Cucumber step definitions for checking fields, HTML content, regex matches, and table data in Webrat-based tests.

Integration tests can fail with undefined method log on Selenium::WebDriver::Remote::W3C::Bridge after enabling Selenium W3C mode; upgrading Capybara restores browser log access.

Verify that page titles contain expected text during browser tests with Selenium and Cucumber, avoiding mismatches in document title assertions.

Run Selenium tests in a hidden X session with vncserver, keeping the browser accessible for inspection without adding a gem.

Geordi 1.0 consolidates Rails project commands into a single CLI with command lookup, dependencies, and new setup, update, console, shell, and test workflows.

Capybara elements become driver-specific when #node is used, breaking code that should work across Rack::Test and Selenium. Prefer the driver-neutral Capybara API for searches and interactions.

Fragile CI builds on Travis often fail with Ruby 1.8.7, incompatible Rubygems, or debugger gems in the test bundle.

Manually requiring Rails models can load classes twice and trigger duplicate validations or other subtle test failures. Let Rails autoload models or require them by the same path Rails uses.

Ruby Proc objects can behave as strict lambdas or flexible blocks, affecting argument handling and return behavior when code is wrapped as callable objects.

Checking response status in Cucumber can verify error handling and redirects during acceptance tests. Webrat and Capybara expose status information for custom step definitions.

Travis CI builds can break after Ubuntu image changes, causing PostgreSQL, MySQL, and Rails test failures. Pinning dist: trusty keeps the older environment until the setup is updated.

Check whether an internet uplink can sustain 1GE or 10GE throughput by pushing traffic internally or from many public mirrors.

Rails default ETags often never repeat because rotating CSRF tokens and CSP nonces change response bytes, blocking cache hits and 304 responses.

Capybara defaults to www.example.com, which can hide hostname-specific behavior in feature tests. Stubbing app_host lets scenarios run against a chosen host without leaking into others.

Reliable Cucumber checks for displayed numbers and monetary amounts prevent false positives from partial matches and accept spaces or nonbreaking spaces before units.

Large legacy data migrations need deep source-system understanding, fast failure, dedicated logging, and traceable migration metadata to keep long-running imports debuggable and verifiable.

Tag specific Cucumber scenarios so they avoid running together when they contend for a shared resource or browser focus, at the cost of slower tests.

Pending Cucumber steps can fail when VCR cassettes contain unused HTTP interactions; @allow_unused_http_interactions can be enabled only for pending features.

Use a separate Chrome build for Selenium tests by pointing Selenium::WebDriver::Chrome.path at a binary from an environment variable, while keeping your normal browser untouched.

Code execution in Claude Code can be isolated to reduce permission prompts and limit file and network access, but it is not a security boundary.