test_dynamic.rb

require 'test_helper'

class TestDynamic < Test::Unit::TestCase
  def setup; end
  def teardown; end

  def test_method1; end
  def test_method2; end
end

# This re-opening of the test-suite class is to add the "ugly"
#  dynamic `#test_parse_*` methods
class TestDynamic
  addrs = [
    {:text   => "test_data",
     :result => "test data"},

    {:text   => "different data",
     :result => "different data",
  ].each do |fixture|
    define_method "test_parse_#{fixture[:text].tr('.,', '').gsub(/\s+/, '_')}" do
      assert_equal fixture[:result], some_method(fixture[:text])
    end
  end
end

The punchline as to how this works is weird... I wanted to do something like

class TestDynamic < Test::Unit::TestCase
  def setup
    build_tests
  end

  def build_tests
    fixtures = [ ... ].each do |fixture|
      define_method "test_#{fixture_name}" do
        check_addr(fixture)
      end
    end
end

This does not work because #setup is only called before each test (kinda like before (:each); do for RSpec). Instead, relying on the fact that all code in a class is executed, works perfectly.