From: Tachikoma <ikari.shinji.eva@...>
Date: 2008-07-16T13:40:22+09:00
Subject: Re: Is it possible to dynamically extend Test::Unit test cases?

On Jul 15, 3:19 pm, David Mitchell <monch1...@gmail.com> wrote:
> Hello list,
>
> I've got some "normal" test cases that look like this
>
> class Testcases < Test::Unit::TestCase
>
>   def setup
>     ...
>   end
>   def teardown
>     ...
>   end
>   def test_1
>     ...
>   end
>   def test_2
>     ...
>   end
> end
>
> The test cases run as expected, but now I need to add some new test
> cases at run time.  What I think I need to do is something like this
>
> require 'testcases'
> t = Testcases.new
> t.send(:define_method, "test_defined_at_run_time", "")
>
> but I'm getting "wrong number of arguments (0 for 1)" when I try to
> create the instance of Testcases.
>
> Is there some way around this?
>
> Thanks in advance
>
> David Mitchell

I took the following test:

require 'test/unit/ui/console/testrunner'
require "test/unit"
class TestCases < Test::Unit::TestCase
  def test_case_1
    p "case 1"
  end
end
eval "class TestCase2 < TestCases;def test_case_2;p 'case 2';end;end;"
Test::Unit::UI::Console::TestRunner.run(TestCases)
Test::Unit::UI::Console::TestRunner.run(TestCase2)

It gives:
Loaded suite TestCases
Started
"case 1"
.
Finished in 0.000433 seconds.

1 tests, 0 assertions, 0 failures, 0 errors
Loaded suite
Started
"case 1"
."case 2"
.
Finished in 0.001912 seconds.

2 tests, 0 assertions, 0 failures, 0 errors

It works well.and following is the same

require 'test/unit/ui/console/testrunner'
require "test/unit"
class TestCases < Test::Unit::TestCase
  def test_case_1
    p "case 1"
  end
end
test_case_2 = Class.new(TestCases) do
  def test_case_2
    p "case 2"
  end
end
Test::Unit::UI::Console::TestRunner.run(TestCases)
Test::Unit::UI::Console::TestRunner.run(test_case_2)

if you take a look into the testcase.rb
def initialize(test_method_name)
so,I wrote the following code:

require 'test/unit/ui/console/testrunner'
require "test/unit"
class TestCases < Test::Unit::TestCase
  def test_case_1
    p "case 1"
  end
  def test_case_2
    p "case 2"
  end
end
test_case_2 = TestCases.new(:test_case_2)
Test::Unit::UI::Console::TestRunner.run(TestCases)
Test::Unit::UI::Console::TestRunner.run(test_case_2)

the result:
Loaded suite TestCases
Started
"case 1"
."case 2"
.
Finished in 0.00051 seconds.

2 tests, 0 assertions, 0 failures, 0 errors
Loaded suite test_case_2(TestCases)
Started
"case 2"
.
Finished in 0.000314 seconds.

1 tests, 0 assertions, 0 failures, 0 errors

so the initialize function takes a methods name,and only the method is
running if you run the instance
but if you run the Class,the test* methods will all run through the
TestCase.suite [testcase.rb]

I hope this will help