Threaded web server benchmark can exhaust application resources more effectively than ApacheBench or httperf; libev is required for installation.

RSpec example groups and shared examples can use symbols as names, even though the official docs do not mention it.

Capybara and Cucumber can verify that a select box includes a disabled choice, using an XPath check on the matching option element.

CucumberFactory 1.11 adds support for FactoryGirl traits, letting Cucumber steps create records with named variations such as vintage and moody.

Polymorphic associations in Cucumber Factory require named associations; indirect references like owner above fail when the target type is ambiguous.

Mock expectations in RSpec can linger across examples; resetting a proxy removes the configured doubles and returns the object to its original state.

Tight should_receive(...).with(...) expectations on hashes are brittle and produce unreadable failures. Block-based argument checks keep RSpec assertions clearer and more flexible.

Gem for instantly showing failing specs while continuing to run the rest of the suite, instead of aborting on the first failure.

Using Consul’s authorization matcher with RSpec 2.x on Rails 3.x can fail because of version incompatibilities. Compatibility requires adapting the matcher setup.

Capybara and selenium-webdriver version mismatches can break element interaction with a private select method error. Aligning gem versions avoids the API incompatibility.

hash_including in WebMock v3.0.1 compares query values as strings, so integer expectations fail unless the request matcher uses '1' instead of 1.

Copy a single MySQL table between deployment stages by dumping it from one database and importing it into another; imports overwrite existing tables, not merge them.

datetime_select creates a clumsy date and time chooser in Rails; a visual picker is usually better, but a Cucumber step can still drive it.

Useful Cucumber steps help inspect a Capybara session by opening the current page in a browser or starting an interactive debugger.

Send raw HTTP or HTTPS requests from the command line when curl is unavailable or unsuitable, using nc, telnet, or openssl s_client.

attribute? often checks presence like attribute.present?, but numeric values and associations behave differently; 0 can be false for ActiveRecord query attributes.

Controller specs can fail without reaching controller code when authentication is missing, no request is triggered, or views stay unrendered.

Geordi 2.7.0 tightens command behavior: cucumber now fails early on @solo feature failures, and commit warns on empty commits while showing progress.

Rails 4 controller specs can send raw JSON in a member action request by passing the JSON body before the route parameters.

Version mismatches between Mocha and Rails 3.2 can trigger an already initialized constant warning; updating Mocha and using a matching Rails version avoids it.

Immediate feedback for failing RSpec examples while passing ones continue to appear as green dots. Uses rspec/instafail with RSpec::Instafail formatting.

rspec_candy 0.4.0 adds support for RSpec 3 and Rails 4, while dropping the unmaintained state_machine integration.