Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/threadgroup/add_spec.rb

@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "ThreadGroup#add" do
+  before :each do
+    @chan1,@chan2 = Channel.new,Channel.new
+    @thread = Thread.new { @chan1 << :go; @chan2.receive }
+    @chan1.receive
+  end
+
+  after :each do
+    @chan2 << :done
+    @thread.join
+  end
+
+  it "adds the given thread to a group and returns self" do
+    @thread.group.should_not == nil
+
+    tg = ThreadGroup.new
+    tg.add(@thread).should == tg
+    @thread.group.should == tg
+    tg.list.include?(@thread).should == true
+  end
+
+  it "removes itself from any other threadgroup" do
+    tg1 = ThreadGroup.new
+    tg2 = ThreadGroup.new
+
+    tg1.add(@thread)
+    @thread.group.should == tg1
+    tg2.add(@thread)
+    @thread.group.should == tg2
+    tg2.list.include?(@thread).should == true
+    tg1.list.include?(@thread).should == false
+  end
+end