diff --git a/library/socket/tcpsocket/recv_nonblock_spec.rb b/library/socket/tcpsocket/recv_nonblock_spec.rb
index bfd815c658..6ce5a41b58 100644
--- a/library/socket/tcpsocket/recv_nonblock_spec.rb
+++ b/library/socket/tcpsocket/recv_nonblock_spec.rb
@@ -27,6 +27,20 @@
     @socket.recv_nonblock(50).should == "TCPSocket#recv_nonblock"
   end
 
+  it 'writes the read to a buffer from the socket' do
+    @socket = TCPSocket.new @hostname, @server.port
+    @socket.write "TCPSocket#recv_nonblock"
+
+    # Wait for the server to echo. This spec is testing the return
+    # value, not the non-blocking behavior.
+    #
+    # TODO: Figure out a good way to test non-blocking.
+    IO.select([@socket])
+    buffer = "".b
+    @socket.recv_nonblock(50, 0, buffer)
+    buffer.should == 'TCPSocket#recv_nonblock'
+  end
+
   it 'returns :wait_readable in exceptionless mode' do
     @socket = TCPSocket.new @hostname, @server.port
     @socket.recv_nonblock(50, exception: false).should == :wait_readable
diff --git a/library/socket/udpsocket/recvfrom_nonblock_spec.rb b/library/socket/udpsocket/recvfrom_nonblock_spec.rb
index c66d1df84d..650a061221 100644
--- a/library/socket/udpsocket/recvfrom_nonblock_spec.rb
+++ b/library/socket/udpsocket/recvfrom_nonblock_spec.rb
@@ -51,6 +51,13 @@
             @server.recvfrom_nonblock(1).should be_an_instance_of(Array)
           end
 
+          it 'writes the data to the buffer when one is present' do
+            buffer = "".b
+            IO.select([@server])
+            @server.recvfrom_nonblock(1, 0, buffer)
+            buffer.should == 'h'
+          end
+
           describe 'the returned Array' do
             before do
               IO.select([@server])