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path: root/spec/ruby/core/kernel/yield_self_spec.rb
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require_relative '../../spec_helper'

ruby_version_is "2.5" do
  describe "Kernel#yield_self" do
    it "yields self" do
      object = Object.new
      object.yield_self { |o| o.should equal object }
    end

    it "returns the block return value" do
      object = Object.new
      object.yield_self { 42 }.should equal 42
    end

    it "returns a sized Enumerator when no block given" do
      object = Object.new
      enum = object.yield_self
      enum.should be_an_instance_of Enumerator
      enum.size.should equal 1
      enum.peek.should equal object
      enum.first.should equal object
    end

    it "has an alias `then`" do
      object = Object.new
      object.then { 42 }.should equal 42
    end
  end
end