Restore serialFileAccessTest

Author: Divya Kamath

.gitignore

@@ -45,6 +45,7 @@ tests
 serialFullTest
 serialFirstHalfTest
 serialSecondHalfTest
+serialFileAccessTest
 core 
 # core is generated by GDB during debugging 
 

Testing/UnitTesting/SerializationFileAccessTest.cpp

@@ -0,0 +1,43 @@
+
+/**
+ * @file SerializationFileAccessTest.cpp
+ *
+ * @brief This file contains the unit test to check if serialization file can 
+ *        be accessed before the simulation starts, using GTest.
+ *
+ * @ingroup Testing/UnitTesting
+ */
+
+#include "Core.h"
+#include "gtest/gtest.h"
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <tinyxml.h>
+
+using namespace std;
+
+// Test case for isSerializedFileWritable function
+TEST(SerializationFileAccessTest, FileWritableTest)
+{
+   string executable = "./cgraphitti";
+   string configFile = "../configfiles/test-small-connected.xml";
+   string nonWritableFilePath = "/root/non_writable_file.txt";
+   string nonWritableArgument = "-c " + configFile + " -w " + nonWritableFilePath;
+
+   Core core;
+
+   // Test a non-writable file
+   ASSERT_EQ(-1, core.runSimulation(executable, nonWritableArgument));
+}
+
+// Optional: create a similar test file to test a a positive case
+// 1. Create a writable file
+// string writableFilePath = "writable_file.txt";
+// string writableArgument = "-c " + configFile + " -w " + writableFilePath;
+// std::ofstream writableFile(writableFilePath);
+// writableFile.close();
+// 2. Test
+// ASSERT_EQ(0, core.runSimulation(executable, writableArgument));
+// 3. Clean up the writable file
+// std::filesystem::remove(writableFilePath);