1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/thread/initialize_spec.rb b/spec/ruby/core/thread/initialize_spec.rb
new file mode 100644
index 0000000000..4fca900cd8
--- /dev/null
+++ b/spec/ruby/core/thread/initialize_spec.rb
@@ -0,0 +1,27 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Thread#initialize" do
+
+  describe "already initialized" do
+
+    before do
+      @t = Thread.new { sleep }
+    end
+
+    after do
+      @t.kill
+      @t.join
+    end
+
+    it "raises a ThreadError" do
+      -> {
+        @t.instance_eval do
+          initialize {}
+        end
+      }.should raise_error(ThreadError)
+    end
+
+  end
+
+end