1 files changed, 16 insertions, 0 deletions
diff --git a/spec/ruby/core/thread/group_spec.rb b/spec/ruby/core/thread/group_spec.rb
new file mode 100644
index 0000000000..d0d4704b66
--- /dev/null
+++ b/spec/ruby/core/thread/group_spec.rb
@@ -0,0 +1,16 @@
+require_relative '../../spec_helper'
+
+describe "Thread#group" do
+  it "returns the default thread group for the main thread" do
+    Thread.main.group.should == ThreadGroup::Default
+  end
+
+  it "returns the thread group explicitly set for this thread" do
+    thread = Thread.new { nil }
+    thread_group = ThreadGroup.new
+    thread_group.add(thread)
+    thread.group.should == thread_group
+  ensure
+    thread.join if thread
+  end
+end