Why am I getting the "wrong number of arguments (0 for 2)" exception in my Ruby code?

Question

I am trying to polish my Ruby by rewriting the Kent Beck xUnit Python example from "Test Driven Development: By Example". I'm pretty far away, but now I get the following error when I run that I don’t get.

C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:21:in `test_running': wrong number of arguments (0 for 2) (ArgumentError)
    from C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:21:in `run'
    from C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:85

My code is as follows:

class TestCase
  def initialize(name)
    puts "1.  inside TestCase.initialise: @name: #{name}"
    @name = name
  end
  def set_up
    # No implementation (but present to be overridden in WasRun) 
  end
  def run
    self.set_up
    self.send @name  # <<<<<<<<<<<<<<<<<<<<<<<<<= ERROR HERE!!!!!!
  end
end

class WasRun < TestCase
  attr_accessor :wasRun
  attr_accessor :wasSetUp 

  def initialize(name)
    super(name)
  end
  def set_up
    @wasRun = false
    @wasSetUp = true
  end
  def test_method
    @wasRun = true
  end
end

class TestCaseTest < TestCase
  def set_up
    @test = WasRun.new("test_method")
  end
  def test_running
    @test.run
    puts "test was run? (true expected): #{test.wasRun}"
  end
  def test_set_up
    @test.run
    puts "test was set up? (true expected): #{test.wasSetUp}"
  end
end

TestCaseTest.new("test_running").run

Can anyone point out my obvious mistake?

Answer 1

This is your print statement:

  puts "test was run? (true expected): #{test.wasRun}"

it should be

  puts "test was run? (true expected): #{@test.wasRun}"

without "@", you call Kernel # test, which expects 2 variables.

Answer 2

, , , send , , .

Object.send

, :

puts "test was run? (true expected): #{test.wasRun}"

:

puts "test was run? (true expected): #{@test.wasRun}"

?