Add missing test for DualMeshType

tests/test_DualMeshType.cpp

@@ -8,6 +8,7 @@
 TEST_CASE("DualMeshType", "[mesh]")
 {
   REQUIRE(name(DualMeshType::Diamond) == "diamond");
+  REQUIRE(name(DualMeshType::Dual1D) == "dual 1d");
   REQUIRE(name(DualMeshType::Median) == "median");
   REQUIRE_THROWS_WITH(name(DualMeshType{-1}), "unexpected error: unexpected dual mesh type");
 }