1 files changed, 69 insertions, 0 deletions
diff --git a/spec/ruby/library/etc/getgrgid_spec.rb b/spec/ruby/library/etc/getgrgid_spec.rb
new file mode 100644
index 0000000000..472d4c82c8
--- /dev/null
+++ b/spec/ruby/library/etc/getgrgid_spec.rb
@@ -0,0 +1,69 @@
+require_relative '../../spec_helper'
+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
+  grpname = nil
+  guard -> {
+    grpname = IO.popen(%w'id -gn', err: IO::NULL, &:read).chomp
+    $?.success?
+  } do
+    describe "Etc.getgrgid" do
+      before :all do
+        @gid = `id -g`.strip.to_i
+        @name = grpname
+      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.is_a?(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 "raises if the group does not exist" do
+        -> { Etc.getgrgid(9876)}.should.raise(ArgumentError)
+      end
+
+      it "raises a TypeError if not passed an Integer" do
+        -> { Etc.getgrgid("foo") }.should.raise(TypeError)
+        -> { Etc.getgrgid(nil)   }.should.raise(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
+end