1 files changed, 51 insertions, 0 deletions
diff --git a/spec/ruby/library/fiber/transfer_spec.rb b/spec/ruby/library/fiber/transfer_spec.rb
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+++ b/spec/ruby/library/fiber/transfer_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../../shared/fiber/resume', __FILE__)
+
+with_feature :fiber_library do
+  require 'fiber'
+
+  describe "Fiber#transfer" do
+    it_behaves_like :fiber_resume, :transfer
+  end
+
+  describe "Fiber#transfer" do
+    it "transfers control from one Fiber to another when called from a Fiber" do
+      fiber1 = Fiber.new { :fiber1 }
+      fiber2 = Fiber.new { fiber1.transfer; :fiber2 }
+      fiber2.resume.should == :fiber1
+    end
+
+    it "returns to the root Fiber when finished" do
+      f1 = Fiber.new { :fiber_1 }
+      f2 = Fiber.new { f1.transfer; :fiber_2 }
+
+      f2.transfer.should == :fiber_1
+      f2.transfer.should == :fiber_2
+    end
+
+    it "can be invoked from the same Fiber it transfers control to" do
+      states = []
+      fiber = Fiber.new { states << :start; fiber.transfer; states << :end }
+      fiber.transfer
+      states.should == [:start, :end]
+
+      states = []
+      fiber = Fiber.new { states << :start; fiber.transfer; states << :end }
+      fiber.resume
+      states.should == [:start, :end]
+    end
+
+    it "can transfer control to a Fiber that has transfered to another Fiber" do
+      states = []
+      fiber1 = Fiber.new { states << :fiber1 }
+      fiber2 = Fiber.new { states << :fiber2_start; fiber1.transfer; states << :fiber2_end}
+      fiber2.resume.should == [:fiber2_start, :fiber1]
+      fiber2.transfer.should == [:fiber2_start, :fiber1, :fiber2_end]
+    end
+
+    it "raises a FiberError when transferring to a Fiber which resumes itself" do
+      fiber = Fiber.new { fiber.resume }
+      lambda { fiber.transfer }.should raise_error(FiberError)
+    end
+  end
+end