From: Bill Guindon <agorilla@...>
Date: 2005-07-14T04:28:14+09:00
Subject: Re: question about ZenTest

On 7/13/05, Bill Guindon <agorilla@gmail.com> wrote:
> I ran ZenTest against the following code:
> 
> module SomeDB
>   class Field
>     attr_accessor :name, :type, :size
> 
>     def initialize(name, type, size=0)
>       @name = name
>       @type = type
>       @size = size
>     end
> 
>     def to_s
>       [@name, @type] << @size unless @size == 0
>     end
>   end
> end
> 
> And it produced the following test code:
> 
> # Code Generated by ZenTest v. 2.3.0
> #                 classname: asrt / meth =  ratio%
> #             SomeDB::Field:    0 /    2 =   0.00%
> 
> require 'test/unit' unless defined? $ZENTEST and $ZENTEST
> 
> module TestSomeDB
>   class TestField < Test::Unit::TestCase
>     def test_name_equals
>       raise NotImplementedError, 'Need to write test_name_equals'
>     end
> 
>     def test_size
>       raise NotImplementedError, 'Need to write test_size'
>     end
> 
>     def test_size_equals
>       raise NotImplementedError, 'Need to write test_size_equals'
>     end
> 
>     def test_type_equals
>       raise NotImplementedError, 'Need to write test_type_equals'
>     end
>   end
> end
> 
> # Number of errors detected: 2
> 
> Any idea why it didn't create stubs for 'test_name' and 'test_size'?
> Shouldn't it have also created a stub for 'test_to_s'?

After poking around in ZenTest, I'm guessing that it's caused by
method subtraction -- something like the following:
  the_methods -= Object.instance_methods(true)
  the_methods -= Kernel.methods 

Which explains why it ignored 'to_s', and had issues with 'name' and
'size', although I still find it strange that it built the '_equals'
methods for them.

Any suggestions on avoiding this?  The obvious answer is not to use
methods with the same name as Object or Kernel methods, but that seems
a bit harsh.

-- 
Bill Guindon (aka aGorilla)