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    • Basic setup for an RSpec based benchmark suite · 19893a1c
      Yorick Peterse authored
      This benchmark suite uses benchmark-ips
      (https://github.com/evanphx/benchmark-ips) behind the scenes. Specs can
      be turned into benchmark specs by setting "benchmark" to "true" in the
      top-level describe block like so:
      
          describe SomeClass, benchmark: true do
      
          end
      
      Writing benchmarks can be done using custom RSpec matchers, for example:
      
          describe MaruTheCat, benchmark: true do
            describe '#jump_in_box' do
              it 'should run 1000 iterations per second' do
                maru = described_class.new
      
                expect { maru.jump_in_box }.to iterate_per_second(1000)
              end
            end
          end
      
      By default the "iterate_per_second" expectation requires a standard
      deviation under 30% (this is just an arbitrary default for now). You can
      change this by chaining "with_maximum_stddev" on the expectation:
      
          expect { maru.jump_in_box }.to iterate_per_second(1000)
            .with_maximum_stddev(10)
      
      This will change the expectation to require a maximum deviation of 10%.
      
      Alternatively you can use the it block style to write specs:
      
          describe MaruTheCat, benchmark: true do
            describe '#jump_in_box' do
              subject { -> { described_class.new } }
      
              it { is_expected.to iterate_per_second(1000) }
            end
          end
      
      Because "iterate_per_second" operates on a block, opposed to a static
      value, the "subject" method must return a Proc. This looks a bit goofy
      but I have been unable to find a nice way around this.
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