1 files changed, 52 insertions, 0 deletions
diff --git a/spec/ruby/core/thread/element_set_spec.rb b/spec/ruby/core/thread/element_set_spec.rb
new file mode 100644
index 0000000000..47b4d06328
--- /dev/null
+++ b/spec/ruby/core/thread/element_set_spec.rb
@@ -0,0 +1,52 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Thread#[]=" do
+  after :each do
+    Thread.current[:value] = nil
+  end
+
+  it "raises a RuntimeError if the thread is frozen" do
+    running = false
+    t = Thread.new do
+      Thread.pass until running
+      t.freeze
+      t[:foo] = "bar"
+    end
+    running = true
+    lambda { t.join }.should raise_error(RuntimeError)
+  end
+
+  it "raises exceptions on the wrong type of keys" do
+    lambda { Thread.current[nil] = true }.should raise_error(TypeError)
+    lambda { Thread.current[5] = true }.should raise_error(TypeError)
+  end
+
+  it "is not shared across fibers" do
+    fib = Fiber.new do
+      Thread.current[:value] = 1
+      Fiber.yield
+      Thread.current[:value].should == 1
+    end
+    fib.resume
+    Thread.current[:value].should be_nil
+    Thread.current[:value] = 2
+    fib.resume
+    Thread.current[:value] = 2
+  end
+
+  it "stores a local in another thread when in a fiber" do
+    fib = Fiber.new do
+      t = Thread.new do
+        sleep
+        Thread.current[:value].should == 1
+      end
+
+      Thread.pass while t.status and t.status != "sleep"
+      t[:value] = 1
+      t.wakeup
+      t.join
+    end
+    fib.resume
+  end
+end