Restarted the production of the app

libs/CLI11/tests/SimpleTest.cpp

@@ -0,0 +1,34 @@
+// Copyright (c) 2017-2022, University of Cincinnati, developed by Henry Schreiner
+// under NSF AWARD 1414736 and by the respective contributors.
+// All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#ifdef CLI11_SINGLE_FILE
+#include "CLI11.hpp"
+#else
+#include "CLI/CLI.hpp"
+#endif
+
+#include "catch.hpp"
+
+using input_t = std::vector<std::string>;
+
+TEST_CASE("Basic: Empty", "[simple]") {
+
+    {
+        CLI::App app;
+        input_t simpleput;
+        app.parse(simpleput);
+    }
+    {
+        CLI::App app;
+        input_t spare = {"spare"};
+        CHECK_THROWS_AS(app.parse(spare), CLI::ExtrasError);
+    }
+    {
+        CLI::App app;
+        input_t simpleput;
+        app.parse(simpleput);
+    }
+}