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require_relative '../../spec_helper'
require_relative '../../shared/fiber/resume'
describe "Fiber#resume" do
it_behaves_like :fiber_resume, :resume
end
describe "Fiber#resume" do
it "runs until Fiber.yield" do
obj = mock('obj')
obj.should_not_receive(:do)
fiber = Fiber.new { 1 + 2; Fiber.yield; obj.do }
fiber.resume
end
it "resumes from the last call to Fiber.yield on subsequent invocations" do
fiber = Fiber.new { Fiber.yield :first; :second }
fiber.resume.should == :first
fiber.resume.should == :second
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.resume :first
fiber.resume :second
end
ruby_version_is '3.0' do
it "raises a FiberError if the Fiber tries to resume itself" do
fiber = Fiber.new { fiber.resume }
-> { fiber.resume }.should raise_error(FiberError, /current fiber/)
end
end
ruby_version_is '' ... '3.0' do
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
end
it "returns control to the calling Fiber if called from one" do
fiber1 = Fiber.new { :fiber1 }
fiber2 = Fiber.new { fiber1.resume; :fiber2 }
fiber2.resume.should == :fiber2
end
# Redmine #595
it "executes the ensure clause" do
code = <<-RUBY
f = Fiber.new do
begin
Fiber.yield
ensure
puts "ensure executed"
end
end
# The apparent issue is that when Fiber.yield executes, control
# "leaves" the "ensure block" and so the ensure clause should run. But
# control really does NOT leave the ensure block when Fiber.yield
# executes. It merely pauses there. To require ensure to run when a
# Fiber is suspended then makes ensure-in-a-Fiber-context different
# than ensure-in-a-Thread-context and this would be very confusing.
f.resume
# When we execute the second #resume call, the ensure block DOES exit,
# the ensure clause runs.
f.resume
exit 0
RUBY
ruby_exe(code).should == "ensure executed\n"
end
end
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