From: Derek Wong <Derek.Wong@...>
Date: 2007-03-20T13:50:44+09:00
Subject: Test::Unit::TestCase derived classes don't work when test	methods are generated dynamically

Hi,

I'm new to the world of Ruby and still getting to grips with the language so please bear with me.

The following script attempts to use the Test::Unit::TestCase framework in conjunction with dynamic test method generation.  It does not work as expected.

require 'test/unit'
require 'test/unit/assertions'

class TestGenerator < Test::Unit::TestCase
	
  def setup
    puts "Setting up"
  end
	
  def teardown
    puts "Tearing down"
  end
		
  def createtests(testname)
    puts "Method name: #{testname}"
    self.class.send(:define_method, testname) {
      puts "#{testname}"
      assert_equal("a", "a", "")
    }
  end
	
  def test_d
    puts "test_d"
    assert_equal("d", "d", "")
    test_a()
    test_b()
    test_c()
  end
	
  def initialize(test_method_name)
    createtests("test_a")
    puts "Created test_a"
    createtests("test_b")
    puts "Created test_b"
    createtests("test_c")
    puts "Created test_c"
		
    my_methods_list = self.methods.sort
    my_methods_list.each do |method|
      #puts "Methods supported #{method}"
    end
    super(test_method_name)
  end
end

I was expecting the following output:

Method name: test_a
Created test_a
Method name: test_b
Created test_b
Method name: test_c
Created test_c
Loaded suite TestGenerator
Started
Setting up
test_a
Tearing down
Setting up
test_b
Tearing down
Setting up
test_c
Tearing down
Setting up
test_d
test_a
test_b
test_c
Tearing down
.

But instead I the following output:

Method name: test_a
Created test_a
Method name: test_b
Created test_b
Method name: test_c
Created test_c
Loaded suite TestGenerator
Started
Setting up
test_d
test_a
test_b
test_c
Tearing down
.

This (and the my_methods_list loop) seems to indicate that test_a(), test_b() and test_c() methods are actually added but for some reason the Test::Unit::TestCase framework does not pick them up.

I am using Ruby 184-20.

Thanks for shedding any light on this.

Regards,
Derek Wong.