add mpi serialization for Welldims

tests/test_ParallelRestart.cpp

@@ -582,6 +582,17 @@ BOOST_AUTO_TEST_CASE(EndpointScaling)
 }
 
 
+BOOST_AUTO_TEST_CASE(Welldims)
+{
+#if HAVE_MPI
+    Opm::Welldims val1(1,2,3,4);
+    auto val2 = PackUnpack(val1);
+    BOOST_CHECK(std::get<1>(val2) == std::get<2>(val2));
+    BOOST_CHECK(val1 == std::get<0>(val2));
+#endif
+}
+
+
 bool init_unit_test_func()
 {
     return true;