1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/library/socket/ancillarydata/cmsg_is_spec.rb b/spec/ruby/library/socket/ancillarydata/cmsg_is_spec.rb
new file mode 100644
index 0000000000..c77f3bdbae
--- /dev/null
+++ b/spec/ruby/library/socket/ancillarydata/cmsg_is_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../spec_helper'
+
+with_feature :ancillary_data do
+  describe 'Socket::AncillaryData#cmsg_is?' do
+    describe 'using :INET, :IP, :TTL as the family, level, and type' do
+      before do
+        @data = Socket::AncillaryData.new(:INET, :IP, :TTL, '')
+      end
+
+      it 'returns true when comparing with IPPROTO_IP and IP_TTL' do
+        @data.cmsg_is?(Socket::IPPROTO_IP, Socket::IP_TTL).should == true
+      end
+
+      it 'returns true when comparing with :IP and :TTL' do
+        @data.cmsg_is?(:IP, :TTL).should == true
+      end
+
+      with_feature :pktinfo do
+        it 'returns false when comparing with :IP and :PKTINFO' do
+          @data.cmsg_is?(:IP, :PKTINFO).should == false
+        end
+      end
+
+      it 'returns false when comparing with :SOCKET and :RIGHTS' do
+        @data.cmsg_is?(:SOCKET, :RIGHTS).should == false
+      end
+
+      it 'raises SocketError when comparing with :IPV6 and :RIGHTS' do
+        -> { @data.cmsg_is?(:IPV6, :RIGHTS) }.should.raise(SocketError)
+      end
+    end
+  end
+end