Enable CMake testing using GTest

Adding a unit test for bug report #147

tests/interfaceTests.cpp

@@ -0,0 +1,43 @@
+/*
+ *
+ * Copyright (C) 2022 Maxime Schmitt <maxime.schmitt91@gmail.com>
+ *
+ * This file is part of Nvtop.
+ *
+ * Nvtop is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Nvtop is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with nvtop.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <gtest/gtest.h>
+
+extern "C" {
+#include "nvtop/interface_layout_selection.h"
+}
+
+TEST(InterfaceLayour, LayoutSelection_issue_147) {
+    plot_info_to_draw to_draw_default = plot_default_draw_info();
+    unsigned nGpu = 8;
+    plot_info_to_draw plot_display[8];
+    for (unsigned i = 0; i < nGpu; ++i)
+        plot_display[i] = to_draw_default;
+    process_field_displayed proc_display = process_default_displayed_field();
+    struct window_position dev_positions[8];
+    struct window_position plot_positions[MAX_CHARTS];
+    unsigned num_plots = 0;
+    unsigned map_dev_to_plot[8];
+    struct window_position process_position;
+    struct window_position setup_position;
+    compute_sizes_from_layout(8, 3, 78, 26, 189, plot_display, proc_display, dev_positions, &num_plots, plot_positions,
+                              map_dev_to_plot, &process_position, &setup_position);
+}