timecop
mutant
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timecop
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About time: how to unit test code that depends on time
The Ruby equivalent is Timecop
https://github.com/travisjeffery/timecop
Dynamic languages have the advantage to be able to rewrite the standard library classes at runtime.
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What questions do you consider important for a Ruby on Rails technical interview?
vs https://github.com/travisjeffery/timecop yes it's true and i am happy to show everybody that they don't need timecop in rails test suite anymore.
- What are your top useful gems?
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Travel in time in development/staing/... in your Rails app
I believe you already familiar with the gem https://github.com/travisjeffery/timecop which is very useful for testing.
mutant
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An ex-Googler's guide to dev tools
There's a pretty good Ruby gem I've used for this before:
https://github.com/mbj/mutant
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Code coverage vs mutation testing.
You should only really care about mutation testing if your code coverage is relatively high. If your code coverage is 20% then mutation testing should not be your priority. We use mutation testing (mutant for Ruby, pitest for Java). mutant is pretty hassle-free but only works when running under MRI so if you use jruby you are out of luck. pitest was far less easy to integrate.
- Mutant – Automated code reviews via mutation testing – semantic code coverage
- Automated code reviews via mutation testing - semantic code coverage.
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Semantic blind spot in Ruby case statement
mutant shows redundant semantics, why we'd like to reduce them is perhaps better explained at https://github.com/mbj/mutant#what-is-mutant
What are some alternatives?
Parallel Tests - Ruby: 2 CPUs = 2x Testing Speed for RSpec, Test::Unit and Cucumber
Ruby-JMeter - A Ruby based DSL for building JMeter test plans
vcr - Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.
Spring - Rails application preloader
R Spec - A minimalist RSpec clone with all the essentials. [Moved to: https://github.com/cyril/r_spec-clone.rb]
Knapsack - Knapsack splits tests evenly across parallel CI nodes to run fast CI build and save you time.
rspec-side_effects - RSpec extension for checking the side effects of your specifications.
Appraisal - A Ruby library for testing your library against different versions of dependencies.