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module Test #:nodoc:
module Unit #:nodoc:
class TestCase #:nodoc:
# Test difference between the return value of method on object for duration of the block
def assert_difference(objects, method = nil, difference = 1)
objects = [objects].flatten
initial_values = objects.inject([]) { |sum,obj| sum << obj.send(method) }
yield
if difference.nil?
objects.each_with_index { |obj,i|
assert_not_equal initial_values[i], obj.send(method), "#{obj}##{method}"
}
else
objects.each_with_index { |obj,i|
assert_equal initial_values[i] + difference, obj.send(method), "#{obj}##{method}"
}
end
end
# Test absence of difference between the return value of method on object for duration of the block
def assert_no_difference(objects, method = nil, &block)
assert_difference objects, method, 0, &block
end
end
end
end
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