test.rb

require 'minitest/autorun'

class TestFoo < MiniTest::Test
  def setup
    print "foo"
  end
end

class TestBar < TestFoo
  def setup
    super
    print 'bar'
  end

  def test_bar
  end
end

class TestBaz < TestFoo
  def setup
    print 'baz'
    super
  end

  def test_baz
  end
end

# $ ruby test.rb
# Run options: --seed 39605
#
# # Running:
#
# foobar.bazfoo.
#
# Finished in 0.001615s, 1238.3901 runs/s, 0.0000 assertions/s.
#
# 2 runs, 0 assertions, 0 failures, 0 errors, 0 skips