ruby--ruby/spec/ruby/core/thread/key_spec.rb

require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "Thread#key?" do
  before :each do
    @th = Thread.new do
      Thread.current[:oliver] = "a"
    end
    @th.join
  end

  it "tests for existence of thread local variables using symbols or strings" do
    @th.key?(:oliver).should == true
    @th.key?("oliver").should == true
    @th.key?(:stanley).should == false
    @th.key?(:stanley.to_s).should == false
  end

  it "raises exceptions on the wrong type of keys" do
    lambda { Thread.current.key? nil }.should raise_error(TypeError)
    lambda { Thread.current.key? 5 }.should raise_error(TypeError)
  end

  it "is not shared across fibers" do
    fib = Fiber.new do
      Thread.current[:val1] = 1
      Fiber.yield
      Thread.current.key?(:val1).should be_true
      Thread.current.key?(:val2).should be_false
    end
    Thread.current.key?(:val1).should_not be_true
    fib.resume
    Thread.current[:val2] = 2
    fib.resume
    Thread.current.key?(:val1).should be_false
    Thread.current.key?(:val2).should be_true
  end

  it "stores a local in another thread when in a fiber" do
    fib = Fiber.new do
      t = Thread.new do
        sleep
        Thread.current.key?(:value).should be_true
      end

      Thread.pass while t.status and t.status != "sleep"
      t[:value] = 1
      t.wakeup
      t.join
    end
    fib.resume
  end
end