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require 'abstract_unit'
require 'test/unit'
require 'active_support'
require 'active_support/core_ext/hash/slice'
class DescendantsTrackerTest < Test::Unit::TestCase
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 [Child1, Grandchild1, Grandchild2, Child2], Parent.descendants
assert_equal [Grandchild1, Grandchild2], Child1.descendants
assert_equal [], Child2.descendants
end
def test_direct_descendants
assert_equal [Child1, Child2], Parent.direct_descendants
assert_equal [Grandchild1, Grandchild2], Child1.direct_descendants
assert_equal [], Child2.direct_descendants
end
def test_clear_with_autoloaded_parent_children_and_granchildren
mark_as_autoloaded(*ALL) do
ActiveSupport::DescendantsTracker.clear
ALL.each do |k|
assert ActiveSupport::DescendantsTracker.descendants(k).empty?
end
end
end
def test_clear_with_autoloaded_children_and_granchildren
mark_as_autoloaded Child1, Grandchild1, Grandchild2 do
ActiveSupport::DescendantsTracker.clear
assert_equal [Child2], Parent.descendants
assert_equal [], Child2.descendants
end
end
def test_clear_with_autoloaded_granchildren
mark_as_autoloaded Grandchild1, Grandchild2 do
ActiveSupport::DescendantsTracker.clear
assert_equal [Child1, Child2], Parent.descendants
assert_equal [], Child1.descendants
assert_equal [], Child2.descendants
end
end
protected
def mark_as_autoloaded(*klasses)
old_autoloaded = ActiveSupport::Dependencies.autoloaded_constants.dup
ActiveSupport::Dependencies.autoloaded_constants = klasses.map(&:name)
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
ActiveSupport::DescendantsTracker.class_eval("@@direct_descendants").replace(old_descendants)
end
end
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