Add basic tcp listener test

crates/lb/tests/net.lua

@@ -49,14 +49,20 @@ describe("tcp", function()
       -- sendbuf
       socket:set_sendbuf(4096)
       assert(socket:sendbuf() >= 4096)
+      assert(not pcall(socket.set_sendbuf, socket, 0))
+      assert(not pcall(socket.set_sendbuf, socket, -1))
       -- recvbuf
       socket:set_recvbuf(4096)
       assert(socket:recvbuf() >= 4096)
+      assert(not pcall(socket.set_recvbuf, socket, 0))
+      assert(not pcall(socket.set_recvbuf, socket, -1))
       -- linger
       socket:set_linger(0)
       assert(socket:linger() == 0)
       socket:set_linger(2)
       assert(math.abs(socket:linger() - 2) < 0.1)
+      socket:set_linger(-1)
+      assert(socket:linger() == 0)
       -- nodelay
       socket:set_nodelay(true)
       assert(socket:nodelay() == true)
@@ -72,4 +78,39 @@ describe("tcp", function()
       assert(not pcall(socket.local_addr, socket))
     end)
   end)
+
+  describe("listener", function()
+    test("accept", function()
+      local listener = net.listen_tcp("127.0.0.1", 0)
+      local addr = listener:local_addr()
+      local accepted = false
+      local client = net.tcp()
+      local accepted_stream
+      listener:on_accept(function(stream)
+        accepted = true
+        accepted_stream = stream
+        -- configure stream
+        stream:set_nodelay(true)
+        assert(stream:nodelay() == true)
+      end)
+      -- connect client
+      local client_stream = client:connect(addr)
+      local server_stream = listener()
+      assert(accepted)
+      assert(accepted_stream ~= nil)
+      -- check addresses
+      assert(server_stream:local_addr() ~= nil)
+      assert(server_stream:peer_addr() ~= nil)
+      assert(client_stream:local_addr() ~= nil)
+      assert(client_stream:peer_addr() ~= nil)
+      -- test data transfer
+      server_stream:write("hello")
+      local buf = client_stream:read(5)
+      assert(buf ~= nil and #buf == 5)
+      assert(buf == "hello")
+      -- shutdown
+      server_stream:shutdown()
+      client_stream:shutdown()
+    end)
+  end)
 end)