A small helper adds a dismissible on-screen badge showing the current Rails environment to prevent confusion between development, test, and production.

Deprecated Ruby tests can flood RSpec output with warning noise. A narrower way to quiet them avoids hiding warnings from dependencies.

Haml 6 renders most custom attributes verbatim, so falsy values no longer remove them. Boolean attributes keep special handling, and Haml::BOOLEAN_ATTRIBUTES can extend that list.

Missing xelatex causes RTeX::Document::ExecutableNotFoundError during tests; installing texlive-xetex on Ubuntu 14.04 provides the binary.

Capybara and Selenium can access only browser globals, so exported JavaScript modules fail in evaluate_script unless the component instance is attached to the element.

esbuild code splitting can reduce main-bundle size, but multiple entry points, chunk cascades, and import-order changes can break builds or runtime behavior.

@javascript Cucumber scenarios run with Selenium and can slow down test runs; cucumber --tags ~@javascript skips them when needed.

Create and verify bcrypt password hashes for Apache authentication, with safer handling than command-line password entry.

Use hash_including in RSpec to verify a hash or method call contains only the expected key-value pairs without matching the full structure.

Selenium on WEBrick fails on HTTPS pages because the server does not speak SSL. Disabling SSL only for those scenarios avoids Cucumber browser test failures.

selenium-webdriver versions after 2.5.0 can make Capybara fail to choose <select> options even when the option is present, affecting Firefox tests.

Pass Cucumber CLI flags such as --tags through parallel_cucumber by wrapping them in --cucumber-options when running test shards.

RSpec examples tagged :vcr automatically record and replay HTTP cassettes, while untagged specs block network calls unless HTTP access is explicitly enabled.

GUI client for testing and communicating with APIs; a less cluttered alternative to Postman and cURL, available via snap or Ubuntu packages.

Long words can overflow layouts when browsers wrap only at word boundaries. CSS hyphenation, soft hyphens, <wbr>, and overflow-wrap offer different control levels.

Flaky end-to-end tests often fail because Capybara outpaces client-side JavaScript and AJAX; synchronizing commands with browser activity makes full-stack integration suites more stable.

Bulk test runs can fail with execution expired (Timeout::Error) when Selenium and WebMock interact; upgrading WebMock to 1.7+ resolves the timeout issue.

Capybara and Cucumber can assert field validation errors by checking for .field_with_errors around a named form field.

RSpec Rails can infer spec behavior from file location, removing manual type tags and enabling request helpers like get and post where appropriate.

We had a conversation about the fact that the 'TDD is about testing vs TDD is about design" debate that keeps popping up, especially now in the Ruby community.

Rails 2.3.x upgrades fix security vulnerabilities and API changes across patch levels, with extra CSRF, XSS, and JSON gem updates needed on some releases.

Automated tests need a way to enter text into JavaScript prompt dialogs in Capybara/Selenium. Browser dialog handling can block workflows unless the prompt input is filled correctly.

HTML-attribute tooltips are entity-encoded, so presence checks need decoded text or encoded matching in Capybara.