message: Update multiplexer unit tests
diff: @@ -144,9 +144,8 @@ CAF_TEST(init) {
  CAF_CHECK_EQUAL(mpx.num_socket_managers(), 0u);
  CAF_REQUIRE_EQUAL(mpx.init(), none);
  CAF_CHECK_EQUAL(mpx.num_socket_managers(), 1u);
  - mpx.close_pipe();
  + mpx.shutdown();
  exhaust();
  - CAF_CHECK_EQUAL(mpx.num_socket_managers(), 0u);
  // Calling run must have no effect now.
  mpx.run();
  }
  @@ -194,7 +193,6 @@ CAF_TEST(shutdown) {
  cv.wait(lk, [&] { return thread_id_set; });
  mpx.shutdown();
  mpx_thread.join();
  - CAF_REQUIRE_EQUAL(mpx.num_socket_managers(), 0u);
  }
  CAF_TEST_FIXTURE_SCOPE_END()
  