Fixing memory problems with test_toolkit

Fixes memory leaks and some minor refactoring.

tests/test_toolkit.hpp

@@ -14,6 +14,9 @@
 #ifndef TEST_TOOLKIT_HPP
 #define TEST_TOOLKIT_HPP
 
+#define _CRTDBG_MAP_ALLOC
+#include <stdlib.h>
+#include <crtdbg.h>
 
 #include "epanet2_2.h"
 
@@ -25,6 +28,9 @@
 
 struct FixtureOpenClose{
     FixtureOpenClose() {
+        error = 0;
+        ph = NULL;
+
         EN_createproject(&ph);
         error = EN_open(ph, DATA_PATH_NET1, DATA_PATH_RPT, DATA_PATH_OUT);
     }
@@ -41,6 +47,9 @@ struct FixtureOpenClose{
 
 struct FixtureAfterStep{
     FixtureAfterStep() {
+        error = 0;
+        ph = NULL;
+
         flag = 0;
         tstop = 10800;