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