diff --git a/lib/erl/test/multiplexing.thrift b/lib/erl/test/multiplexing.thrift
new file mode 100644
index 0000000..7c7994b
--- /dev/null
+++ b/lib/erl/test/multiplexing.thrift
@@ -0,0 +1,7 @@
+service Multiplexing_Calculator {
+    i32 add(1: i32 x, 2: i32 y)
+}
+
+service Multiplexing_WeatherReport {
+    double getTemperature()
+}
diff --git a/lib/erl/test/multiplexing_test.erl b/lib/erl/test/multiplexing_test.erl
new file mode 100644
index 0000000..0f2d616
--- /dev/null
+++ b/lib/erl/test/multiplexing_test.erl
@@ -0,0 +1,57 @@
+-module(multiplexing_test).
+
+-include_lib("eunit/include/eunit.hrl").
+
+-export([
+     handle_function/2
+    ,handle_error/2
+]).
+
+start_multiplexed_server_test() ->
+
+    Port = 9090,
+    Services = [
+                {"Multiplexing_Calculator",    multiplexing__calculator_thrift},
+                {"Multiplexing_WeatherReport", multiplexing__weather_report_thrift}
+               ],
+
+    {ok, Pid} = thrift_socket_server:start([
+        {ip, "127.0.0.1"},
+        {port, Port},
+        {name, ?MODULE},
+        {service, Services},
+        {handler, [
+            {"error_handler",              ?MODULE},
+            {"Multiplexing_Calculator",    ?MODULE},
+            {"Multiplexing_WeatherReport", ?MODULE}
+        ]}
+     ]),
+
+    {ok, [{"Multiplexing_Calculator", CalculatorClient0},
+          {"Multiplexing_WeatherReport", WeatherReportClient0}]} = thrift_client_util:new_multiplexed("127.0.0.1", Port, Services, []),
+
+    ?assertMatch({_, {error, {bad_args, _, _}}}, thrift_client:call(WeatherReportClient0, getTemperature, [1])),
+    ?assertMatch({_, {error, {bad_args, _, _}}}, thrift_client:call(CalculatorClient0, add, [1])),
+    ?assertMatch({_, {error, {bad_args, _, _}}}, thrift_client:call(CalculatorClient0, add, [1,1,1])),
+
+    ?assertMatch({_, {error, {no_function, _}}}, thrift_client:call(CalculatorClient0, getTemperature, [])),
+    ?assertMatch({_, {error, {no_function, _}}}, thrift_client:call(WeatherReportClient0, add, [41, 1])),
+
+    ?assertMatch({_, {ok, 42}}, thrift_client:call(CalculatorClient0, add, [41, 1])),
+    ?assertMatch({_, {ok, 42.0}}, thrift_client:call(WeatherReportClient0, getTemperature, [])),
+
+    thrift_socket_server:stop(Pid).
+
+%% HANDLE FUNCTIONS
+
+%% Calculator handles
+handle_function(add, {X, Y}) ->
+    {reply, X + Y};
+
+%% WeatherReport handles
+handle_function(getTemperature, {}) ->
+    {reply, 42.0}.
+
+handle_error(_F, _Reason) ->
+%%     ?debugHere, ?debugVal({_F, _Reason}),
+    ok.
\ No newline at end of file
diff --git a/lib/erl/test/thrift_socket_server_test.erl b/lib/erl/test/thrift_socket_server_test.erl
new file mode 100644
index 0000000..0818b84
--- /dev/null
+++ b/lib/erl/test/thrift_socket_server_test.erl
@@ -0,0 +1,49 @@
+-module (thrift_socket_server_test).
+
+-include_lib("eunit/include/eunit.hrl").
+
+-include ("thrift_constants.hrl").
+
+parse_handler_options_test_() ->
+    CorrectServiceHandlerOptionList = [{?MULTIPLEXED_ERROR_HANDLER_KEY, ?MODULE}, {"Service1", ?MODULE}, {"Service2", ?MODULE}],
+    MissingErrorHandlerOptionList   = [{"Service1", ?MODULE}, {"Service2", ?MODULE}],
+    WrongService2HandlerOptionList  = [{?MULTIPLEXED_ERROR_HANDLER_KEY, ?MODULE}, {"Service1", ?MODULE}, {"Service2", "Module"}],
+    WrongServiceKeyOptionList       = [{?MULTIPLEXED_ERROR_HANDLER_KEY, ?MODULE}, {'service1', ?MODULE}, {"Service2", ?MODULE}],
+    CorrectHandlerTestFunction = fun() ->
+        ?assertMatch({thrift_socket_server,_,_,_,_,_,_,_,_,_,_,_,_,_}, thrift_socket_server:parse_options([{handler, CorrectServiceHandlerOptionList}])),
+        {thrift_socket_server,_,_, HandlerList,_,_,_,_,_,_,_,_,_,_} = thrift_socket_server:parse_options([{handler, CorrectServiceHandlerOptionList}]),
+        lists:foreach(fun
+            ({ServiceName, HandlerModule}) ->
+                ?assertMatch({ok, HandlerModule} when is_atom(HandlerModule), thrift_multiplexed_map_wrapper:find(ServiceName, HandlerList))
+        end, CorrectServiceHandlerOptionList)
+    end,
+    [
+     {"Bad argument for the handler option", ?_assertThrow(_, thrift_socket_server:parse_options([{handler, []}]))},
+     {"Try to parse the handler option twice", ?_assertThrow(_, thrift_socket_server:parse_options([{handler, ?MODULE}, {handler, CorrectServiceHandlerOptionList}]))},
+     {"Parse the handler option as a non multiplexed service handler", ?_assertMatch({thrift_socket_server,_,_,?MODULE,_,_,_,_,_,_,_,_,_,_}, thrift_socket_server:parse_options([{handler, ?MODULE}]))},
+     {"No error handler was defined", ?_assertThrow(_, thrift_socket_server:parse_options([{handler, MissingErrorHandlerOptionList}]))},
+     {"Bad handler module for Service2", ?_assertThrow(_, thrift_socket_server:parse_options([{handler, WrongService2HandlerOptionList}]))},
+     {"Bad service key for Service1", ?_assertThrow(_, thrift_socket_server:parse_options([{handler, WrongServiceKeyOptionList}]))},
+     {"Try to parse a correct handler option list", CorrectHandlerTestFunction}
+    ].
+
+parse_service_options_test_() ->
+    CorrectServiceModuleOptionList = [{"Service1", ?MODULE}, {"Service2", ?MODULE}],
+    WrongService2ModuleOptionList  = [{"Service1", ?MODULE}, {"Service2", "thrift_service_module"}],
+    WrongServiceKeyOptionList       = [{'service1', ?MODULE}, {"Service2", ?MODULE}],
+    CorrectServiceModuleTestFunction = fun() ->
+        ?assertMatch({thrift_socket_server,_,_,_,_,_,_,_,_,_,_,_,_,_}, thrift_socket_server:parse_options([{service, CorrectServiceModuleOptionList}])),
+        {thrift_socket_server,_, ServiceModuleList,_,_,_,_,_,_,_,_,_,_,_} = thrift_socket_server:parse_options([{service, CorrectServiceModuleOptionList}]),
+        lists:foreach(fun
+            ({ServiceName, ServiceModule}) ->
+                ?assertMatch({ok, ServiceModule} when is_atom(ServiceModule), thrift_multiplexed_map_wrapper:find(ServiceName, ServiceModuleList))
+        end, CorrectServiceModuleOptionList)
+    end,
+    [
+     {"Bad argument for the service option", ?_assertThrow(_, thrift_socket_server:parse_options([{service, []}]))},
+     {"Try to parse the service option twice", ?_assertThrow(_, thrift_socket_server:parse_options([{service, ?MODULE}, {service, CorrectServiceModuleOptionList}]))},
+     {"Parse a service module for a non multiplexed service", ?_assertMatch({thrift_socket_server,_,?MODULE,_,_,_,_,_,_,_,_,_,_,_}, thrift_socket_server:parse_options([{service, ?MODULE}]))},
+     {"Bad service module for Service2", ?_assertThrow(_, thrift_socket_server:parse_options([{service, WrongService2ModuleOptionList}]))},
+     {"Bad service key for Service1", ?_assertThrow(_, thrift_socket_server:parse_options([{service, WrongServiceKeyOptionList}]))},
+     {"Try to parse a correct service option list", CorrectServiceModuleTestFunction}
+    ].