From: Chad Perrin <code@...>
Date: 2011-06-19T09:30:14+09:00
Subject: test scope issue

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My tests are broken.  I generally suck at writing tests, so please bear
with me.

    require 'test/unit'
    require '../life.rb'
   =20
    class TestLife < Test::Unit::TestCase
      def setup
        @life =3D Life.new
      end
   =20
      def test_life_exists
        assert( @life )
      end
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      def test_vivify_vivifies
        @life.vivify(2,-1)
        assert( @life.world[2][-1] )
      end
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      def test_murder_kills
        @life.murder(2,-1)
        assert( !@life.world[2][-1] )
      end
    end

I seem to be having a scoping issue here, where the changes made in
test_vivify_vivifies are not applying to @life in the general case; they
go away after test_vivify_vivifies ends, so that test_murder_kills errors
out because @life.world[2] doesn't exist at all at that point.

I have verified that when I run the code in life.rb using irb, the
@life.vivify actually gives me what I expect, and @life.murder thus works
perfectly well there.  Actually, I don't even use the @ for an instance
variable when doing that; I only included it here to avoid scoping issues
with local variables, but I seem to be having different scoping issues as
a result.  It so far seems to be only when running tests that there is an
error.

I'm probably doing something stupid, but I have not yet seen it.

--=20
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]

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