Applying RSpec Best Practises
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  • 1. Applying RSpec Best Practices Kevin McKelvin Rubyfuza 2013
  • 2. Ground Rules• Tests must support OO principles• Tests must be technical documentation for the code
  • 3. The Example Conway’s Game of LifeDeterministicZero Player Game
  • 4. Be descriptive it “should work!” do end
  • 5. The describe block describe Game do end Describe a Ruby Constant
  • 6. The describe block describe Game do describe "#tick" do end end Prefix instance methods with # and class methods with .
  • 7. The context blockdescribe Game do describe "#tick" do context "when given an empty world" do end endend Use contexts to find edge cases Start contexts with when or with
  • 8. The it blockdescribe Game do describe "#tick" do context "when given an empty world" do it "returns an empty world" do end end endend “Do or do not, there is no try” - Yoda
  • 9. Use RSpec Matchersdescribe Game do describe "#tick" do context "when given an empty world" do it "returns an empty world" do empty_world = World.new second_world = subject.tick( empty_world) second_world.empty?.must.equal true end end endend
  • 10. Use RSpec Matchersdescribe Game do describe "#tick" do context "when given an empty world" do it "returns an empty world" do empty_world = World.new second_world = subject.tick( empty_world) second_world.must.be_empty end end endend
  • 11. RSpec Settings.rspec --color --profile --format d
  • 12. Running Your SpecsGame #tick when given an empty world returns an empty world when given a world with one cell returns an empty world when given a world with three adjacentcells returns a world with one cell
  • 13. Remember TDDSupport Object Oriented best-practices SOLID Law of Demeter
  • 14. Remember TDDDon’t test your framework
  • 15. Remember TDDAvoid integration testing where possible
  • 16. Remember TDDBe the first consumer of your public API
  • 17. ResourcesRSpec:http://rspec.info/The RSpec Book:http://pragprog.com/book/achbd/the-rspec-bookBetter Specs:http://www.betterspecs.orgMustard:https://github.com/ryanb/mustard