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describe :scheduler, shared: true do
it "validates the scheduler for required methods" do
required_methods = [:block, :unblock, :kernel_sleep, :io_wait]
required_methods.each do |missing_method|
scheduler = Object.new
required_methods.difference([missing_method]).each do |method|
scheduler.define_singleton_method(method) {}
end
-> {
suppress_warning { Fiber.set_scheduler(scheduler) }
}.should raise_error(ArgumentError, /Scheduler must implement ##{missing_method}/)
end
end
it "can set and get the scheduler" do
required_methods = [:block, :unblock, :kernel_sleep, :io_wait]
scheduler = Object.new
required_methods.each do |method|
scheduler.define_singleton_method(method) {}
end
suppress_warning { Fiber.set_scheduler(scheduler) }
Fiber.scheduler.should == scheduler
end
it "returns the scheduler after setting it" do
required_methods = [:block, :unblock, :kernel_sleep, :io_wait]
scheduler = Object.new
required_methods.each do |method|
scheduler.define_singleton_method(method) {}
end
result = suppress_warning { Fiber.set_scheduler(scheduler) }
result.should == scheduler
end
it "can remove the scheduler" do
required_methods = [:block, :unblock, :kernel_sleep, :io_wait]
scheduler = Object.new
required_methods.each do |method|
scheduler.define_singleton_method(method) {}
end
suppress_warning { Fiber.set_scheduler(scheduler) }
Fiber.set_scheduler(nil)
Fiber.scheduler.should be_nil
end
it "can assign a nil scheduler multiple times" do
Fiber.set_scheduler(nil)
Fiber.set_scheduler(nil)
Fiber.scheduler.should be_nil
end
end
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