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module ActiveRecord
  # Share connection between threads to make it possible to wrap system tests in a transaction.
  # Also synchonize queries to avoid concurrent writes/reads.
  #
  # For PostgreSQL adapter.
  module OneLove
    class << self
      attr_reader :connection

      def connection=(conn)

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module RSpecHell
  def run_examples(reporter)
    return super unless metadata[:hell] && !(metadata[:parent_example_group] && metadata[:parent_example_group].key?(:hell))
    pool_size = ENV['HELL'].to_i

    q = Queue.new
    ordering_strategy.order(descendant_filtered_examples).each { |ex| q << ex }

    workers = []
    results = []

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module RSpec
  class EventProfiler # :nodoc:
    # Add #duration method to floats
    module FloatDuration
      refine Float do
        def duration
          t = self
          format("%02d:%02d.%03d", t / 60, t % 60, t.modulo(1) * 1000)
        end
      end

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module FactoryGirl
  module Doctor
    module FloatDuration
      refine Float do
        def duration
          t = self
          format("%02d:%02d.%03d", t / 60, t % 60, t.modulo(1) * 1000)
        end
      end
    end

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# if you want to render flamegraphs
gem "stackprof", require: false # required by flamegraph
gem "flamegraph", require: false

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module FactoryDefault
  module CreateDefaultMethod
    def create_default(name, *args, &block)
      res = create(name, *args, &block)
      FactoryDefault.register(name, res)
      res
    end
  end

  module RunnerExt

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require 'rubocop/rspec/language'

module RuboCop
  module Cop
    module RSpec
      class AggregateFailures < RuboCop::Cop::Cop
        GROUP_BLOCKS = RuboCop::RSpec::Language::ExampleGroups::ALL
        EXAMPLE_BLOCKS = RuboCop::RSpec::Language::Examples::ALL

        def on_block(node)

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module AnyFixture
  INSERT_RXP = /^INSERT INTO ([\S]+)/

  class Cache
    attr_reader :store

    delegate :clear, to: :store

    def initialize
      @store = {}

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module StiUpdate
  def as(type)
    if self.type == type
      self
    else
      klass = type.camelize.constantize
      if klass.nil?
        self
      else
        became = self.becomes!(klass)

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Installation

Go to the official website and choose your OS.

MacOS

Docker for Mac has a problem is the disk IO performance (see docker/for-mac#77).

There is a fix (https://github.com/IFSight/d4m-nfs) which makes Docker use NFS instead of OSXFS.