Email client styling support is fragmented, so feature checks help avoid unsupported CSS but cannot replace real-client rendering tests.

Eventually you’ll forget that you used to spend hours testing your code in a browser, and start complaining that your automated tests are taking minutes to run! You’ll have intense debates with co-workers about what to test and how to test it properly. You’ll start writing the test first to expose the bug or missing feature, then write the code required to pass the test.

Jasmine boot failures can stem from browser/module detection issues, causing jasmineRequire or getJasmineRequireObj() errors in Webpacker and esbuild setups.

Checking for an ActiveRecord scope with is_a?(ActiveRecord::NamedScope::Scope) breaks in Rails 3 and misses unscoped model classes. respond_to?(:scoped) is a broader check.

Large Rails projects benefit from keeping application tasks slim, separating the executable wrapper from the business code, and testing both rake tasks and scripts.

Capybara matchers and finders can take a Ruby block for extra DOM conditions when built-in options are not enough. Script calls inside filter blocks need a temporary wait time to avoid Selenium timeouts.

rspec_candy packages reusable RSpec helpers as a gem, making setup and updates easier for specs that need shared test utilities.

Regular-expression syntax for matching characters, boundaries, alternation, quantifiers, look-arounds, and Ruby modifiers. Useful for writing and debugging patterns safely.

VCR records each request only once, so replaying repeated identical calls can fail unless allow_playback_repeats is enabled.

Template-based examples reduce repetition in behavior-driven tests and make repetitive cases easier to maintain.

Fixes for flaky browser tests in Spreewald 0.9.4, including a resolved “I click on ...” step and broader Selenium retry handling.

A too-large class is harder to understand, test, and change. Several refactoring approaches break it into smaller responsibilities.

Send deployment notifications from Capistrano to Slack channels using slackistrano and incoming webhooks, with customizable message formatting.

Synthetic user events for typing, clicking, moving, and dragging provide realistic interaction handling for tests and automation.

document.activeElement returns the currently focused DOM element and is useful for checking focus state in JavaScript or Selenium tests.

Capybara matchers can be applied to standalone HTML fragments or strings, not only full pages, making fragment assertions easier in test suites.

PDF form fields in Prawn require manual AcroForm objects and widget annotations; viewers can render text inputs when appearance data and page annotations are set correctly.

Shared RSpec examples can be rerun by --example substring match or example ID when rspec file:line cannot target them directly.

DOM event handler exceptions are swallowed, so later listeners and dispatchEvent() continue running. Uncaught errors still reach the browser log and window error event.

Simple Git configuration for new developers: aliases, rebase defaults, diff tools, and GitLab push shortcuts for a cleaner workflow.

Internet Explorer 9 can fail on large stylesheets because of hard parser limits: file count, selector count, and nested @import depth.

patiently helpers are now packaged as the patiently gem, with configurable retries and timeouts for feature and system specs.

When you roll custom URLs with hacks like routing-filter, you can put a spec like this into spec/routing/routing_spec.rb: