From: Brian Candler <b.candler@...>
Date: 2009-11-10T18:57:34+09:00
Subject: Re: wrong number of arguments in initialize

Arti Singh wrote:
> I tried to initalize my methods and I get an error
>   def initialize(name,browser,username)
>     @s_name=name
>     @browser=browser
>     @username=username
>   end #def initialize(dc)
>  attr_accessor :name,:browser,:username
> 
> C:/RubyInstall/ruby/lib/ruby/1.8/test/unit/testcase.rb:59:in
> `initialize': wrong number of arguments (1 for 3) (ArgumentError)

Open that file in a text editor, go to line 59, and you'll see

          catch(:invalid_test) do
            suite << new(test)         #### ERROR RAISED HERE
          end

Then scroll up and you'll see you're inside the 'suite' class method of 
class Test::Unit::TestCase, and higher up you'll see

      def initialize(test_method_name)
        ...

That is, when a Test::Unit::TestCase instance is created, it takes a 
single argument which is the test method name.

Almost certainly you should not be meddling with the 'initialize' method 
of Test::Unit::TestCase. What exactly are you trying to do? I guess you 
want to be able to run the same test suite multiple times with different 
parameters? The simplest way may be

  def setup
    @s_name=ENV['TEST_S_NAME']
    @browser=ENV['TEST_BROWSER']
    @username=ENV['TEST_USERNAME']
  end

Then you can do

  rake test TEST_S_NAME=xxx TEST_BROWSER=yyy TEST_USERNAME=zzz

An alternative way is to have a separate class for each of your 
scenarios, and share the test methods using subclassing or module 
mixins. Then running the suite will run all of the variations in one go.

  require 'test/unit'

  class TestFoo < Test::Unit::TestCase
    def setup
      @browser = "foo browser"
    end
    def test_it
      puts "Browser is #{@browser}"
      assert true
    end
  end

  class TestBar < TestFoo
    def setup
      @browser = "bar browser"
    end
  end
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