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describe :fiber_resume, shared: true do
it "can be invoked from the root Fiber" do
fiber = Fiber.new { :fiber }
fiber.send(@method).should == :fiber
end
it "raises a FiberError if the Fiber tries to resume itself" do
fiber = Fiber.new { fiber.resume }
-> { fiber.resume }.should raise_error(FiberError, /double resume/)
end
it "raises a FiberError if invoked from a different Thread" do
fiber = Fiber.new { }
lambda do
Thread.new do
fiber.resume
end.join
end.should raise_error(FiberError)
fiber.resume
end
it "passes control to the beginning of the block on first invocation" do
invoked = false
fiber = Fiber.new { invoked = true }
fiber.send(@method)
invoked.should be_true
end
it "returns the last value encountered on first invocation" do
fiber = Fiber.new { 1+1; true }
fiber.send(@method).should be_true
end
it "runs until the end of the block" do
obj = mock('obj')
obj.should_receive(:do).once
fiber = Fiber.new { 1 + 2; a = "glark"; obj.do }
fiber.send(@method)
end
it "runs until Fiber.yield" do
obj = mock('obj')
obj.should_not_receive(:do)
fiber = Fiber.new { 1 + 2; Fiber.yield; obj.do }
fiber.send(@method)
end
it "resumes from the last call to Fiber.yield on subsequent invocations" do
fiber = Fiber.new { Fiber.yield :first; :second }
fiber.send(@method).should == :first
fiber.send(@method).should == :second
end
it "accepts any number of arguments" do
fiber = Fiber.new { |a| }
lambda { fiber.send(@method, *(1..10).to_a) }.should_not raise_error
end
it "sets the block parameters to its arguments on the first invocation" do
first = mock('first')
first.should_receive(:arg).with(:first).twice
fiber = Fiber.new { |arg| first.arg arg; Fiber.yield; first.arg arg; }
fiber.send(@method, :first)
fiber.send(@method, :second)
end
it "raises a FiberError if the Fiber is dead" do
fiber = Fiber.new { true }
fiber.send(@method)
lambda { fiber.send(@method) }.should raise_error(FiberError)
end
it "raises a LocalJumpError if the block includes a return statement" do
fiber = Fiber.new { return; }
lambda { fiber.send(@method) }.should raise_error(LocalJumpError)
end
it "raises a LocalJumpError if the block includes a break statement" do
fiber = Fiber.new { break; }
lambda { fiber.send(@method) }.should raise_error(LocalJumpError)
end
end
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