Test how we can release resources or processes when an exception is raised during test

ensure_teardown.rb

require "minitest/autorun"

def raise_an_exception
  raise "Raised!"
end

module Minitest
  module Ensure
    def ensure_to_call_after(name)
      old_test_method = instance_method("test_#{name}")
      define_method "test_#{name}" do
        begin
          old_test_method.bind(self).()
        rescue StandardError => e
          puts "Gotcha! #{e}"
          fail
        end
      end
    end
  end
end

class TestMinitestEnsure < Minitest::Test
  extend Minitest::Ensure

  def setup
    puts "Setup!"
  end

  def teardown
    puts "TearDown!"
  end

  def test_one
    assert raise_an_exception
  end

  def test_two
    assert raise_an_exception
  end

  ensure_to_call_after :one
end

output.txt

$ ruby ensure_teardown.rb 
Run options: --seed 40063

# Running:

Setup!
Gotcha! Raised!
TearDown!
ESetup!
TearDown!
E

Finished in 0.000863s, 2317.3897 runs/s, 0.0000 assertions/s.

  1) Error:
TestMinitestEnsure#test_one:
RuntimeError: Raised!
    ensure.rb:4:in `raise_an_exception'
    ensure.rb:35:in `test_one'
    ensure.rb:13:in `call'
    ensure.rb:13:in `block in ensure_to_call_after'


  2) Error:
TestMinitestEnsure#test_two:
RuntimeError: Raised!
    ensure.rb:4:in `raise_an_exception'
    ensure.rb:39:in `test_two'

2 runs, 0 assertions, 0 failures, 2 errors, 0 skips