1 files changed, 48 insertions, 0 deletions
diff --git a/spec/ruby/library/fiber/alive_spec.rb b/spec/ruby/library/fiber/alive_spec.rb
new file mode 100644
index 0000000000..fbd5c4bc1a
--- /dev/null
+++ b/spec/ruby/library/fiber/alive_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+with_feature :fiber_library do
+  require 'fiber'
+
+  describe "Fiber#alive?" do
+    it "returns true for a Fiber that hasn't had #resume called" do
+      fiber = Fiber.new { true }
+      fiber.alive?.should be_true
+    end
+
+    # FIXME: Better description?
+    it "returns true for a Fiber that's yielded to the caller" do
+      fiber = Fiber.new { Fiber.yield }
+      fiber.resume
+      fiber.alive?.should be_true
+    end
+
+    it "returns true when called from its Fiber" do
+      fiber = Fiber.new { fiber.alive?.should be_true }
+      fiber.resume
+    end
+
+    it "doesn't invoke the block associated with the Fiber" do
+      offthehook = mock('do not call')
+      offthehook.should_not_receive(:ring)
+      fiber = Fiber.new { offthehook.ring }
+      fiber.alive?
+    end
+
+    it "returns false for a Fiber that's dead" do
+      fiber = Fiber.new { true }
+      fiber.resume
+      lambda { fiber.resume }.should raise_error(FiberError)
+      fiber.alive?.should be_false
+    end
+
+    it "always returns false for a dead Fiber" do
+      fiber = Fiber.new { true }
+      fiber.resume
+      lambda { fiber.resume }.should raise_error(FiberError)
+      fiber.alive?.should be_false
+      lambda { fiber.resume }.should raise_error(FiberError)
+      fiber.alive?.should be_false
+      fiber.alive?.should be_false
+    end
+  end
+end