prove meets Ruby

approve.rb

# Place this in test/
#
# Run your tests with:
#
#   prove -e 'ruby -Ilib:test' -v t/*.rb
#
# See the bottom for usage.

require 'minitest/unit'

module Approve
  include MiniTest::Assertions

  CTX = { :current => 0 }
  PASSTHROUGH_EXCEPTIONS = [NoMemoryError, SignalException, Interrupt, SystemExit]

  module_function

  def test(name)
    yield if block_given?
    puts "ok #{CTX[:current] += 1} - #{name}"
  rescue *PASSTHROUGH_EXCEPTIONS
    raise

  rescue MiniTest::Assertion
    puts "not ok #{CTX[:current] += 1} - #{name}"

    last_before_assertion = ""
    $!.backtrace.reverse_each do |s|
      break if s =~ /in .(assert|refute|flunk|pass|fail|raise|must|wont)/
      last_before_assertion = s
    end

    puts last_before_assertion.sub(/:in .*$/, '').sub(/^/, '# ')
    puts $!.to_s.gsub(/^/, '# ')

  rescue Exception
    puts "not ok #{CTX[:current] += 1} - #{name}"
    bt = MiniTest.filter_backtrace($!.backtrace).join "\n    "

    puts "# #{$!.class}: #{$!.message}"
    puts bt.gsub(/^/, '# ')
  end

  def done
    puts "1..#{CTX[:current]}"
  end
end

if $0 == __FILE__
  # This should go in t/approve.rb
  require 'approve'
  include Approve

  test "something" do
    assert_equal 4, 2 + 2
    assert true
  end

  test "failing" do
    assert false
  end
end