Add some tests from OH.

test14.cpp

+// test_class.cpp
+//
+// The Makefile expects that the project solution has main() in a file
+// named project*.cpp.  For your own testing purposes, .cpp files that
+// begin with 'test' can include a main(), that will not conflict with
+// the project solution main().  Also, the test*.cpp files will not be
+// included in any submission archives.
+//
+// Tests can be built in two ways:
+//  $ make test_class   // Make the test in test_class.cpp with all other
+//                      // source (and header) files.
+//  $ make alltests     // Make all tests in test*.cpp with all other
+//                      // source (and header) files.
+
+#include "class.h"
+
+int main () {
+    // Stack
+    Class a(0, 0);
+    a.display();
+
+    // Heap
+    Class *b = new Class(1, 1);
+    b->display();
+    delete b;
+
+    return 0;
+}

test_another.cpp

+// test_class.cpp
+//
+// The Makefile expects that the project solution has main() in a file
+// named project*.cpp.  For your own testing purposes, .cpp files that
+// begin with 'test' can include a main(), that will not conflict with
+// the project solution main().  Also, the test*.cpp files will not be
+// included in any submission archives.
+//
+// Tests can be built in two ways:
+//  $ make test_class   // Make the test in test_class.cpp with all other
+//                      // source (and header) files.
+//  $ make alltests     // Make all tests in test*.cpp with all other
+//                      // source (and header) files.
+
+#include "class.h"
+
+int main () {
+    // Stack
+    Class a(0, 0);
+    a.display();
+
+    // Heap
+    Class *b = new Class(1, 1);
+    b->display();
+    delete b;
+
+    return 0;
+}