autorun.rb

# HOW TO USE:
#
# 1) save this to /some_path/lib/minitests/autorun.rb
# 2) run your test with RSpec, e.g.
#
#   $ RUBYLIB=/some_path/lib rspec -f d test/hello_test.rb

require 'rspec/core'
require 'rspec/matchers'

RSpec::Core::Runner.disable_autorun!
RSpec.configure do |c|
  c.expect_with :minitest
end

module MiniTest
  class Test
  end
end

at_exit do
  constants = Object.constants.select
  selected = constants.select do |const|
    next unless const =~ /Test$/
    klass = Object.const_get(const)
    next unless klass.respond_to?(:superclass)
    klass.superclass == MiniTest::Test
  end

  klasses = selected.map { |name| Object.const_get(name) }

  klasses.each do |klass|
    group = RSpec.describe(klass)

    meths = klass.public_instance_methods.select { |meth| /^test_/ =~ meth }

    group.around do |example|
      klass.include(RSpec::Matchers)
      @__rspec_test_instance = klass.new(klass.to_s)
      @__rspec_test_instance.setup if @instance.respond_to?(:setup)
      example.run
      @__rspec_test_instance.teardown if @instance.respond_to?(:teardown)
    end

    meths.each do |meth|
      group.it(meth.to_s[/^test_(.*)/,1].tr('_',' ')) do |example|
        @__rspec_test_instance.method(meth).call
      end
    end
  end

  RSpec::Core::Runner.run([])
end