Add initialization of variables to constructor

src/reconstruction/reconstruction.h

@@ -42,6 +42,9 @@ struct InterfaceState {
                  Real const in_total_pressure = 0.0)
       : density(in_density), velocity(in_velocity), energy(in_energy), pressure(in_pressure)
   {
+    momentum.x = velocity.x * density;
+    momentum.y = velocity.y * density;
+    momentum.z = velocity.z * density;
 #ifdef MHD
     magnetic       = in_magnetic;
     total_pressure = in_total_pressure;

src/utils/basic_structs.h

@@ -78,12 +78,16 @@ struct Primitive {
   Primitive() = default;
   /// Manual constructor, mostly used for testing and doesn't init all members
   Primitive(Real const in_density, Vector const &in_velocity, Real const in_pressure,
-            Vector const &in_magnetic = {0, 0, 0})
+            Vector const &in_magnetic = {0, 0, 0}, Real const in_gas_energy_specific = 0.0)
       : density(in_density), velocity(in_velocity), pressure(in_pressure)
   {
 #ifdef MHD
     magnetic = in_magnetic;
 #endif  // mhd
+
+#ifdef DE
+    gas_energy_specific = in_gas_energy_specific;
+#endif  // DE
   };
 };
 // =====================================================================================================================