1 files changed, 58 insertions, 0 deletions
diff --git a/spec/ruby/core/process/egid_spec.rb b/spec/ruby/core/process/egid_spec.rb
new file mode 100644
index 0000000000..69c86bebe2
--- /dev/null
+++ b/spec/ruby/core/process/egid_spec.rb
@@ -0,0 +1,58 @@
+require_relative '../../spec_helper'
+
+describe "Process.egid" do
+  it "returns the effective group ID for this process" do
+    Process.egid.should.is_a?(Integer)
+  end
+
+  it "also goes by Process::GID.eid" do
+    Process::GID.eid.should == Process.egid
+  end
+
+  it "also goes by Process::Sys.getegid" do
+    Process::Sys.getegid.should == Process.egid
+  end
+end
+
+describe "Process.egid=" do
+
+  platform_is_not :windows do
+    it "raises TypeError if not passed an Integer or String" do
+      -> { Process.egid = Object.new }.should.raise(TypeError)
+    end
+
+    it "sets the effective group id to its own gid if given the username corresponding to its own gid" do
+      raise unless Process.gid == Process.egid
+
+      require "etc"
+      group = Etc.getgrgid(Process.gid).name
+
+      Process.egid = group
+      Process.egid.should == Process.gid
+    end
+
+    as_user do
+      it "raises Errno::ERPERM if run by a non superuser trying to set the root group id" do
+        -> { Process.egid = 0 }.should.raise(Errno::EPERM)
+      end
+
+      platform_is :linux do
+        it "raises Errno::ERPERM if run by a non superuser trying to set the group id from group name" do
+          -> { Process.egid = "root" }.should.raise(Errno::EPERM)
+        end
+      end
+    end
+
+    as_superuser do
+      context "when ran by a superuser" do
+        it "sets the effective group id for the current process if run by a superuser" do
+          code = <<-RUBY
+            Process.egid = 1
+            puts Process.egid
+          RUBY
+          ruby_exe(code).should == "1\n"
+        end
+      end
+    end
+  end
+end