Added char * << to MString for string assignment.

testing/mstring_test.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include "../MString.h"
+   
+int main(int argc, char **argv) {
+
+   // Literal string assignment tests. 
+   coreutils::MString test1 = "this is an assignment test.";
+   std::cout << "char * operator=: [" << test1 << "]." << std::endl;
+   test1 = "new value.";
+   std::cout << "char * operator=: [" << test1 << "]." << std::endl;   
+
+   coreutils::MString test2("this is another test.");
+   std::cout << "assign on constructor: [" << test2 << "]." << std::endl;   
+
+   // Character assignment tests.
+   coreutils::MString test3;
+   test3 = 'a';
+   std::cout << "char operator=: [" << test3 << "]." << std::endl;   
+
+   coreutils::MString test4;
+   test4 << "this is a test.";
+   std::cout << "char* operator<<: [" << test4 << "]." << std::endl;   
+      
+//   coreutils::ZString temp("this is literal zstring data.");
+//   coreutils::MString test = temp;
+//   std::cout << "operator=: [" << test << "]." << std::endl;   
+   
+   return 0;
+}
+