Little test scaffold for Project Euler problems.

testem.rb

if __FILE__ == $0
    require 'minitest/autorun'
    require 'benchmark'
    require 'logger'

    output = StringIO.new
    logger = Logger.new output
    logger.formatter = ->(severity, datetime, progname, msg) { msg + "\n" }

    describe "solution" do

        before :each do
            logger.info "Running #{name}..."
        end

        CASES.each do |label, work|
            it "should calculate the #{label} case" do
                assert_equal ANSWERS[label], work.call()
            end

            it "should calculate the #{label} case in less than one minute" do
                report = Benchmark.measure &work
                logger.debug report.to_s.strip
                assert_operator report.real, :<=, 60.0
            end
        end

    end

    if ENV['DEBUG']
        Minitest.after_run do
            puts
            output.rewind
            print output.read
        end
    end
end