1 files changed, 41 insertions, 0 deletions
diff --git a/spec/ruby/core/fiber/new_spec.rb b/spec/ruby/core/fiber/new_spec.rb
new file mode 100644
index 0000000000..a3361acc65
--- /dev/null
+++ b/spec/ruby/core/fiber/new_spec.rb
@@ -0,0 +1,41 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+with_feature :fiber do
+  describe "Fiber.new" do
+    it "creates a fiber from the given block" do
+      fiber = Fiber.new {}
+      fiber.resume
+      fiber.should be_an_instance_of(Fiber)
+    end
+
+    it "creates a fiber from a subclass" do
+      class MyFiber < Fiber
+      end
+      fiber = MyFiber.new {}
+      fiber.resume
+      fiber.should be_an_instance_of(MyFiber)
+    end
+
+    it "raises an ArgumentError if called without a block" do
+      lambda { Fiber.new }.should raise_error(ArgumentError)
+    end
+
+    it "does not invoke the block" do
+      invoked = false
+      fiber = Fiber.new { invoked = true }
+      invoked.should be_false
+      fiber.resume
+    end
+
+    it "closes over lexical environments" do
+      o = Object.new
+      def o.f
+        a = 1
+        f = Fiber.new { a = 2 }
+        f.resume
+        a
+      end
+      o.f.should == 2
+    end
+  end
+end