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require 'set'
module DescendantsTrackerTestCases
class Parent
extend ActiveSupport::DescendantsTracker
end
class Child1 < Parent
end
class Child2 < Parent
end
class Grandchild1 < Child1
end
class Grandchild2 < Child1
end
ALL = [Parent, Child1, Child2, Grandchild1, Grandchild2]
def test_descendants
assert_equal_sets [Child1, Grandchild1, Grandchild2, Child2], Parent.descendants
assert_equal_sets [Grandchild1, Grandchild2], Child1.descendants
assert_equal_sets [], Child2.descendants
end
def test_direct_descendants
assert_equal_sets [Child1, Child2], Parent.direct_descendants
assert_equal_sets [Grandchild1, Grandchild2], Child1.direct_descendants
assert_equal_sets [], Child2.direct_descendants
end
def test_clear
mark_as_autoloaded(*ALL) do
ActiveSupport::DescendantsTracker.clear
ALL.each do |k|
assert ActiveSupport::DescendantsTracker.descendants(k).empty?
end
end
end
protected
def assert_equal_sets(expected, actual)
assert_equal Set.new(expected), Set.new(actual)
end
def mark_as_autoloaded(*klasses)
# If ActiveSupport::Dependencies is not loaded, forget about autoloading.
# This allows using AS::DescendantsTracker without AS::Dependencies.
if defined? ActiveSupport::Dependencies
old_autoloaded = ActiveSupport::Dependencies.autoloaded_constants.dup
ActiveSupport::Dependencies.autoloaded_constants = klasses.map(&:name)
end
old_descendants = ActiveSupport::DescendantsTracker.class_eval("@@direct_descendants").dup
old_descendants.each { |k, v| old_descendants[k] = v.dup }
yield
ensure
ActiveSupport::Dependencies.autoloaded_constants = old_autoloaded if defined? ActiveSupport::Dependencies
ActiveSupport::DescendantsTracker.class_eval("@@direct_descendants").replace(old_descendants)
end
end
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