From: "Derrick B." <lists@...>
Date: 2013-01-05T03:48:18+09:00
Subject: Re: require "test/unit"

Mattias A. wrote in post #1090700:
> Hi Damián M. González!
>
> Tanks for your reply, i have found below but it do not answer my
> question or I do not know how to read/use it.. :/
>

I'm kind of new to using test/unit ( and Ruby!  :)  ), but I was getting
that same error, too.  What I discovered was just adding a test class to
my existing code caused that error until I stripped the code down to
just classes.  For example, I wrote a simple Calculator class with four
methods (add, subtract, multiply, divide).  I then added code for it to
be interactive.  I had to then remove that extra code so that my file
contains only the Calculator class and the TestClass, which included the
test cases, then it worked.

So, I think (and I am guessing here) that your test files should only
include classes to be tested and the actual testing class.  That would
make sense, because when testing code, you are mainly concerned with
static test cases which cover all possible execution paths, so why
bother with user interaction.

Here are the two files, the original and the one modified for testing:

######## Original #################
class Calculator
  def initialize(a, b)
    @a, @b = a, b
  end
  def add
    @a + @b
  end
  def sub
    @a - @b
  end
  def mul
    @a * @b
  end
  def div
    return "undef" if @b == 0
    @a / @b
  end
end

x, y = ARGV[0].to_i, ARGV[1].to_i
if ARGV.length == 0
  print "Usage calc 3 4\n"
  exit
end
c = Calculator.new( x, y )
puts "#{x} plus #{y} equals: #{c.add}"
puts "#{x} minus #{y} equals: #{c.sub}\n"
puts "#{x} times #{y} equals: #{c.mul}\n"
puts "#{x} divided by #{y} equals: #{c.div}\n"


######## For Testing #################
require 'test/unit'

class Calculator
  def initialize(a, b)
    @a, @b = a, b
  end
  def add
    @a + @b
  end
  def sub
    @a - @b
  end
  def mul
    @a * @b
  end
  def div
    return "undef" if @b == 0
    @a / @b
  end
end

class TestClass < Test::Unit::TestCase
  def test_add
    c = Calculator.new( 12, 3 )
    assert_equal 15, c.add
  end
  def test_sub
    c = Calculator.new( 12, 3 )
    assert_equal 9, c.sub
  end
  def test_mul
    c = Calculator.new( 12, 3 )
    assert_equal 36, c.mul
  end
  def test_div
    c = Calculator.new( 12, 3 )
    assert_equal 4, c.div
  end
end

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