fixed a bug that returned the wrong grid to the test method

include/tug/Simulation.hpp

@@ -103,11 +103,11 @@ class Simulation {
         void printConcentrationsCSV(string filename);
 
         /**
-         * @brief Start the simulation with all of the previously set parameters. 
+         * @brief 
          * 
-         * @return auto 
+         * @return Grid 
          */
-        void run();
+        Grid run();
 
     private:
 

src/Simulation.cpp

@@ -146,7 +146,7 @@ void Simulation::printConcentrationsCSV(string filename) {
     file.close();
 }
 
-void Simulation::run() {
+Grid Simulation::run() {
     string filename;
     if (this->console_output > CONSOLE_OUTPUT_OFF) {
         printConcentrationsConsole();
@@ -191,4 +191,6 @@ void Simulation::run() {
     if (this->csv_output > CSV_OUTPUT_OFF) {
         printConcentrationsCSV(filename);
     }
+
+    return grid;
 }

test/testSimulation.cpp

@@ -50,9 +50,7 @@ static Grid setupSimulation() {
 
 
     // RUN
-    sim.run();
-
-    return grid;
+    return sim.run();
 }
 
 TEST_CASE("equality to reference matrix") {