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require_relative '../../spec_helper'
require_relative '../module/fixtures/classes'
describe "Class#subclasses" do
it "returns a list of classes directly inheriting from self" do
assert_subclasses(ModuleSpecs::Parent, [ModuleSpecs::Child, ModuleSpecs::Child2])
end
it "does not return included modules from the parent" do
parent = Class.new
child = Class.new(parent)
mod = Module.new
parent.include(mod)
assert_subclasses(parent, [child])
end
it "does not return included modules from the child" do
parent = Class.new
child = Class.new(parent)
mod = Module.new
parent.include(mod)
assert_subclasses(parent, [child])
end
it "does not return prepended modules from the parent" do
parent = Class.new
child = Class.new(parent)
mod = Module.new
parent.prepend(mod)
assert_subclasses(parent, [child])
end
it "does not return prepended modules from the child" do
parent = Class.new
child = Class.new(parent)
mod = Module.new
child.prepend(mod)
assert_subclasses(parent, [child])
end
it "does not return singleton classes" do
a = Class.new
a_obj = a.new
def a_obj.force_singleton_class
42
end
a.subclasses.should_not include(a_obj.singleton_class)
end
it "has 1 entry per module or class" do
ModuleSpecs::Parent.subclasses.should == ModuleSpecs::Parent.subclasses.uniq
end
it "works when creating subclasses concurrently" do
t = 16
n = 1000
go = false
superclass = Class.new
threads = t.times.map do
Thread.new do
Thread.pass until go
n.times.map do
Class.new(superclass)
end
end
end
go = true
classes = threads.map(&:value)
superclass.subclasses.size.should == t * n
superclass.subclasses.each { |c| c.should be_kind_of(Class) }
end
def assert_subclasses(mod,subclasses)
mod.subclasses.sort_by(&:inspect).should == subclasses.sort_by(&:inspect)
end
end
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