class ParallelTests

def self.tests_in_groups(root, num_groups, options={})

finds all tests and partitions them into groups 
def self.tests_in_groups(root, num_groups, options={})
  tests = find_tests(root, options)
  if options[:no_sort] == true
    Grouper.in_groups(tests, num_groups)
  else
    tests = with_runtime_info(tests)
    Grouper.in_even_groups_by_size(tests, num_groups)
  end
end