Class: RSpec::Matchers::BenchmarkComparison

Inherits:
Object
  • Object
show all
Defined in:
lib/should_be_faster.rb

Instance Method Summary collapse

Constructor Details

#initialize(rhs_code, options = {}) ⇒ BenchmarkComparison

Returns a new instance of BenchmarkComparison.



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# File 'lib/should_be_faster.rb', line 13

def initialize(rhs_code, options={})
  @rhs_code = rhs_code
  @options  = options
  @options[:iterations] ||= 100
  @options[:factor]     ||= 1
  @options[:faster]       = @options[:faster]
end

Instance Method Details

#benchmark_comparison ⇒ Object 



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# File 'lib/should_be_faster.rb', line 21

def benchmark_comparison
  factor  = @options[:factor]
  iter    = @options[:iterations]
  matcher = @options[:matcher]
  faster  = @options[:faster]
  rhs     = _benchmark(@rhs_code, iter).real
  lhs     = nil

  matcher.match do |lhs_code|
    lhs = (_benchmark(lhs_code, iter).real * factor)
    if faster
      lhs < rhs
    else
      lhs > rhs
    end
  end

  matcher.instance_eval do
    failure_message_for_should do |actual|
      if faster
        "ran too slow: #{lhs / rhs}x, #{lhs - rhs}s"
      else
        "ran too fast: #{rhs / lhs}x, #{rhs - lhs}s"
      end
    end

    failure_message_for_should_not do |actual|
      if faster
        "ran too slow: #{rhs / lhs}x, #{rhs - lhs}s"
      else
        "ran too fast: #{lhs / rhs}x, #{lhs - rhs}s"
      end
    end

    description do
      if faster
        "be faster than #{rhs}"
      else
        "be slower than #{rhs}"
      end
    end
  end
end