1 files changed, 22 insertions, 0 deletions

diff --git a/spec/ruby/core/process/initgroups_spec.rb b/spec/ruby/core/process/initgroups_spec.rb
new file mode 100644
index 0000000000..d9f31936cb
--- /dev/null
+++ b/spec/ruby/core/process/initgroups_spec.rb
@@ -0,0 +1,22 @@
+require_relative '../../spec_helper'
+
+describe "Process.initgroups" do
+  platform_is_not :windows, :android do
+    as_user do
+      it "initializes the supplemental group access list" do
+        name = `id -un`.strip
+        groups = Process.groups
+        gid = groups.max.to_i + 1
+        augmented_groups = `id -G`.scan(/\d+/).map {|i| i.to_i} << gid
+        if Process.uid == 0
+          Process.groups = []
+          Process.initgroups(name, gid).sort.should == augmented_groups.sort
+          Process.groups.sort.should == augmented_groups.sort
+          Process.groups = groups
+        else
+          -> { Process.initgroups(name, gid) }.should.raise(Errno::EPERM)
+        end
+      end
+    end
+  end
+end