module ActiveSupport::Testing::Isolation

def self.forking_env?
  !ENV["NO_FORK"] && Process.respond_to?(:fork)
end

def self.included(klass) # :nodoc:
  klass.class_eval do
    parallelize_me! unless Minitest.parallel_executor.is_a?(ActiveSupport::Testing::ParallelizeExecutor)
  end
end

def run
  status, serialized = run_in_isolation do
    super
  end
  unless status&.success?
    error = SubprocessCrashed.new("Subprocess exited with an error: #{status.inspect}\noutput: #{serialized.inspect}")
    error.set_backtrace(caller)
    self.failures << Minitest::UnexpectedError.new(error)
    return defined?(Minitest::Result) ? Minitest::Result.from(self) : dup
  end
  Marshal.load(serialized)
end