Created the main entry of the test suite.

tests/src/main.cpp

@@ -0,0 +1,9 @@
+#include <iostream>
+#include <gtest/gtest.h>
+
+
+
+int main(int argc, char *argv[]) {
+    testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}