Add missing unit_test.inc file

unittests/unit_test.inc

@@ -0,0 +1,23 @@
+def assert_equal(x, y)
+{
+  if (x == y)
+  {
+    // Passes
+  } else {
+    // Fails
+    print("assert_equal failure: got " + to_string(y) + " expected " + to_string(x));
+    exit(-1);
+  }
+}
+
+def assert_throws(desc, x)
+{
+  if (throws_exception(x))
+  {
+    // Passes
+  } else {
+    // Fails
+    print("assert_throws failure, function did not throw exception: " + to_string(desc));
+    exit(-1);
+  }
+}