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/library/etc/getgrgid_spec.rb

@@ -0,0 +1,70 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'etc'
+
+platform_is :windows do
+  describe "Etc.getgrgid" do
+    it "returns nil" do
+      Etc.getgrgid(1).should == nil
+      Etc.getgrgid(nil).should == nil
+      Etc.getgrgid('nil').should == nil
+    end
+  end
+end
+
+# TODO: verify these on non-windows, non-darwin OS
+platform_is_not :windows do
+  describe "Etc.getgrgid" do
+    before :all do
+      @gid = `id -g`.strip.to_i
+      @name = `id -gn`.strip
+    end
+
+    it "returns a Etc::Group struct instance for the given user" do
+      gr = Etc.getgrgid(@gid)
+
+      gr.is_a?(Etc::Group).should == true
+      gr.gid.should == @gid
+      gr.name.should == @name
+    end
+
+    it "returns the Etc::Group for a given gid if it exists" do
+      grp = Etc.getgrgid(@gid)
+      grp.should be_kind_of(Etc::Group)
+      grp.gid.should == @gid
+      grp.name.should == @name
+    end
+
+    it "uses Process.gid as the default value for the argument" do
+      gr = Etc.getgrgid
+
+      gr.gid.should == @gid
+      gr.name.should == @name
+    end
+
+    it "returns the Group for a given gid if it exists" do
+      grp = Etc.getgrgid(@gid)
+      grp.should be_kind_of(Struct::Group)
+      grp.gid.should == @gid
+      grp.name.should == @name
+    end
+
+    it "raises if the group does not exist" do
+      lambda { Etc.getgrgid(9876)}.should raise_error(ArgumentError)
+    end
+
+    it "raises a TypeError if not passed an Integer" do
+      lambda { Etc.getgrgid("foo") }.should raise_error(TypeError)
+      lambda { Etc.getgrgid(nil)   }.should raise_error(TypeError)
+    end
+
+    it "can be called safely by multiple threads" do
+      20.times.map do
+        Thread.new do
+          100.times do
+            Etc.getgrgid(@gid).gid.should == @gid
+          end
+        end
+      end.each(&:join)
+    end
+  end
+end