1 files changed, 31 insertions, 0 deletions
diff --git a/spec/ruby/core/thread/current_spec.rb b/spec/ruby/core/thread/current_spec.rb
new file mode 100644
index 0000000000..f5ed1d95cd
--- /dev/null
+++ b/spec/ruby/core/thread/current_spec.rb
@@ -0,0 +1,31 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Thread.current" do
+  it "returns a thread" do
+    current = Thread.current
+    current.should be_kind_of(Thread)
+  end
+
+  it "returns the current thread" do
+    t = Thread.new { Thread.current }
+    t.value.should equal(t)
+    Thread.current.should_not equal(t.value)
+  end
+
+  it "returns the correct thread in a Fiber" do
+    # This catches a bug where Fibers are running on a thread-pool
+    # and Fibers from a different Ruby Thread reuse the same native thread.
+    # Caching the Ruby Thread based on the native thread is not correct in that case.
+    2.times do
+      t = Thread.new {
+        cur = Thread.current
+        Fiber.new {
+          Thread.current
+        }.resume.should equal cur
+        cur
+      }
+      t.value.should equal t
+    end
+  end
+end