power_assert

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$ gem install minitest-power_assert

# test.rb
require 'minitest-power_assert'
require 'minitest/autorun'

class TestPowerAssert < Minitest::Test
  def test_power_assert_failed
    assert { "0".class == "3".to_i.times.map {|i| i + 1 }.class }
  end
end

$ ruby test.rb
Run options: --seed 36110

# Running:

F

Finished in 0.004967s, 201.3478 runs/s, 201.3478 assertions/s.

  1) Failure:
TestPowerAssert#test_power_assert_failed [tst.rb:6]:
    assert { "0".class == "3".to_i.times.map {|i| i + 1 }.class }
                 |     |      |    |     |                |
                 |     |      |    |     |                Array
                 |     |      |    |     [1, 2, 3]
                 |     |      |    #<Enumerator: 3:times>
                 |     |      3
                 |     false
                 String

1 runs, 1 assertions, 1 failures, 0 errors, 0 skips