rspec power assert

test.rb

require 'rspec'
require 'minitest'
require 'minitest-power_assert'

module Minitest
  module Assertions
    prepend  Minitest::PowerAssert::Assertions
  end
end

RSpec.configure do |config|
  config.expect_with :minitest
end

describe 'Test' do
  it 'test' do
    assert { 1.to_s.class == 1.to_i.class }
  end
end

Thank you for sharing it.