From: Mark Volkmann <r.mark.volkmann@...>
Date: 2006-03-24T05:46:37+09:00
Subject: Re: Inheritance Question

On 3/23/06, David Solis <dsolis@yahoo.com> wrote:
> Hello,
>
> I'm having difficulty understanding inheritance in this case. In the
> program below, I'm inheriting from <Test::Unit::TestCase. I also want my
> other class in this program to inherit from <Test::Unit::TestCase.

There's no problem with having multiple classes in the same source
file inherit from some other class.

> My
> goal is to be able to make assertions in both classes.
>
> If a run the program as written below, it works.
>
> require 'test/unit'
> require 'test/unit/ui/console/testrunner'
>
> class TC_MyTest < Test::Unit::TestCase
>   def test_myMethod
>     puts 'test 1'
>       assert(true, 'test 1')
>     @test = TC_MyClass.new()
>     @test_new = @test.test_myTestCase
>   end
> End
>
> class TC_MyClass
>   def initialize
>   end
>   def test_myTestCase
>     puts 'test 2'
>       #assert(true, 'test 2')
>     puts 'test 3'
>     puts 'test 4'
>   end
> end
>
> But if try to do this, I get an error:
>
> class TC_MyTest < Test::Unit::TestCase
>   def test_myMethod
>     puts 'test 1'
>       assert(true, 'test 1')
>     @test = TC_MyClass.new()
>     @test_new = @test.test_myTestCase
>   end
> End
>
> class TC_MyClass < Test::Unit::TestCase
>   def initialize
>   end
>   def test_myTestCase
>     puts 'test 2'
>       assert(true, 'test 2')
>     puts 'test 3'
>     puts 'test 4'
>   end
> end
> ---------------------
> c:/ruby/lib/ruby/1.8/test/unit/testcase.rb:51:in `initialize': wrong
> number of arguments (1 for 0) (ArgumentError)

You don't need the initialize method in TC_MyClass. Delete that and
see if it works.

There's still something strange going on here though. Why do you want
to put asserts in the class being tested? Normally all the asserts go
in the class doing the testing. Also, normally the classes being
tested and the test classes are in separate source files.

--
R. Mark Volkmann
Object Computing, Inc.