Command line

$ time ruby rspec.rb && time ruby minispec.rb && time ruby minitest.rb
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Finished in 3.37 seconds
1501 examples, 0 failures

real	0m3.666s
user	0m0.747s
sys	0m0.145s
Run options: --seed 23693

# Running:

.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Finished in 3.156915s, 475.4642 runs/s, 3642.7968 assertions/s.

1501 runs, 11500 assertions, 0 failures, 0 errors, 0 skips

real	0m3.488s
user	0m0.574s
sys	0m0.141s
Run options: --seed 45238

# Running:

.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Finished in 3.097505s, 484.5836 runs/s, 3712.6655 assertions/s.

1501 runs, 11500 assertions, 0 failures, 0 errors, 0 skips

real	0m3.410s
user	0m0.500s
sys	0m0.141s

minispec.rb

require 'minitest/autorun'

describe "MiniSpec" do
  before do
    @numbers = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2
  end

  it "is fast" do
    sleep(1)
    (1..5000).each do |n|
      n.must_equal(n)
      refute_nil n
    end
  end

  (1..1500).each do |n|
    it "is example #{n}" do
      sleep(0.001)
      refute_nil (1 * @numbers)
    end
  end

  after(:each) do
    @numbers = nil
  end
end

minitest.rb

require 'minitest/autorun'

class MinitestTest < Minitest::Test
  def setup
    @numbers = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2
  end

  def teardown
    @numbers = nil
  end

  def test_is_fast
    sleep(1)
    (1..5000).each do |n|
      assert_equal n, n
      refute n.zero?
    end
  end
  (1..1500).each do |n|
    define_method("test_is_example#{n}") do
      sleep(0.001)
      refute_nil (1 * @numbers)
    end
  end
end

rspec.rb

require 'rspec/autorun'

describe "RSpec" do
  before(:each) do
    @numbers = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2
  end

  it "is fast" do
    sleep(1)
    (1..5000).each do |n|
      n.should eq(n)
      n.should_not be_zero
    end
  end

  (1..1500).each do |n|
    it "is example #{n}" do
      sleep(0.001)
      (1 * @numbers).should_not be_nil
    end
  end

  after(:each) do
    @numbers = nil
  end
end