Cobblers:
Below my sig is a Shoes class and a test rig, illustrating an
application-specific assertion. The other good news is it's short.
To TDD with such a rig, you alternate between improving the assertions,
improving the test cases, and improving the code. Eventually you will have a
suite of assertions that detect graphical effects relevant to your application,
and you TDD by reusing these.
(Rails's controller tests illustrate this effect, where the "application" is the
web's GET and POST actions.)
The issues:
- Shoes dislikes being told when to start and stop
- Shoes resists commands from without.
Together, those problems break test isolation. A test rig, even if it paints a
window, on your monitor, should disappear and report to its environment. And
common windowing toolkits do not need to paint a window just to report what they
would have painted.
Any suggestions?
--
Phlip
http://flea.sourceforge.net/PiglegToo_1.html
require 'test/unit'
require 'test/unit/ui/console/testrunner'
class HexShape < Shoes
HEX_SHAPE = [
[ 0, 9.375],
[ 0, 28.125],
[16.2375, 37.5 ],
[32.475, 28.125],
[32.475, 9.375],
[16.2375, 0 ] ].freeze
def hex(exx, why, size)
shape do
eol = HEX_SHAPE[-1]
move_to eol[0] * size + exx, eol[1] * size + why
HEX_SHAPE.each{|x,y| line_to(x * size + exx, y * size + why) }
end
end
def draw_a_hex
background rgb(0, 0, 0)
fill gray(0xAA)
hex(100, 150, 2)
end
def index
$that = self
::Test::Unit::UI::Console::TestRunner.run(HexShapeTest.suite)
# #quit # TODO uh... bye bye? syonara? exit?
end
url '/', :index
end
HexShape::app :title => 'testage'
class HexShapeTest < Test::Unit::TestCase
require 'rexml/document'
def indent_xml(doc)
@_xdoc = REXML::Document.new(doc)
end
def activate_shoes(*args)
indent_xml $that.snapshot{ $that.send(*args) }
end
def test_hex
activate_shoes :draw_a_hex
assert_hexagon
end
def assert_hexagon
REXML::XPath.each(@_xdoc, '//path') do |path|
return path if path.attributes['d'].scan(/[A-Z]/) == %w(M L L L L L L Z M)
end
end
end
