context for ActiveSupport::TestCase

test_helper.rb

class ActiveSupport::TestCase
  # context 'foo' => class Context_foo < self
  def self.context(name, &block)
    class_name = "Context_#{name.gsub(/[[:^word:]]+/, '_')}".to_sym
    const_set(class_name, Class.new(self, &block))
  end
end

usage.rb

require 'test_helper'

class FooTest < ActiveSupport::TestCase
  context 'bar' do
    test 'returns foobar' do
      assert(Foo.bar == 'foobar')
    end
  end
end