Added first C++ test

SCsub

@@ -6,6 +6,7 @@ Import('env_modules')
 # SIMD noise support would have to wait for Godot 4...
 FAST_NOISE_2_SRC = False
 FAST_NOISE_2_STATIC = False
+RUN_TESTS = True
 
 env_voxel = env_modules.Clone()
 
@@ -57,6 +58,12 @@ if env["tools"]:
 	]
 	voxel_files += voxel_editor_files
 
+if RUN_TESTS:
+	voxel_files += [
+		"tests/tests.cpp"
+	]
+	env_voxel.Append(CPPDEFINES={"VOXEL_RUN_TESTS": 0})
+
 if env["platform"] == "windows":
 	# When compiling SQLite with Godot on Windows with MSVC, it produces the following warning:
 	# `sqlite3.c(42754): warning C4996: 'GetVersionExA': was declared deprecated `

register_types.cpp

@@ -49,6 +49,10 @@
 #include "editor/voxel_debug.h"
 #endif
 
+#ifdef VOXEL_RUN_TESTS
+#include "tests/tests.h"
+#endif
+
 void register_voxel_types() {
 	VoxelMemoryPool::create_singleton();
 	VoxelStringNames::create_singleton();
@@ -136,6 +140,10 @@ void register_voxel_types() {
 	EditorPlugins::add_by_type<VoxelInstanceLibraryEditorPlugin>();
 	EditorPlugins::add_by_type<FastNoiseLiteEditorPlugin>();
 #endif
+
+#ifdef VOXEL_RUN_TESTS
+	run_voxel_tests();
+#endif
 }
 
 void unregister_voxel_types() {

tests/tests.cpp

@@ -0,0 +1,42 @@
+#include "tests.h"
+#include "../util/math/rect3i.h"
+
+#include <core/hash_map.h>
+#include <core/print_string.h>
+
+void test_rect3i_for_inner_outline() {
+	const Rect3i box(-1, 2, 3, 4, 3, 2);
+
+	HashMap<Vector3i, bool, Vector3iHasher> expected_coords;
+	const Rect3i inner_box = box.padded(-1);
+	box.for_each_cell([&expected_coords, inner_box](Vector3i pos) {
+		expected_coords.set(pos, false);
+	});
+
+	box.for_inner_outline([&expected_coords](Vector3i pos) {
+		bool *b = expected_coords.getptr(pos);
+		if (b == nullptr) {
+			ERR_FAIL_MSG("Unexpected position");
+		}
+		if (*b) {
+			ERR_FAIL_MSG("Duplicate position");
+		}
+		*b = true;
+	});
+
+	const Vector3i *key = nullptr;
+	while ((key = expected_coords.next(key))) {
+		bool v = expected_coords[*key];
+		if (!v) {
+			ERR_FAIL_MSG("Missing position");
+		}
+	}
+}
+
+void run_voxel_tests() {
+	print_line("------------ Voxel tests begin -------------");
+
+	test_rect3i_for_inner_outline();
+
+	print_line("------------ Voxel tests end -------------");
+}

tests/tests.h

@@ -0,0 +1,6 @@
+#ifndef VOXEL_TESTS_H
+#define VOXEL_TESTS_H
+
+void run_voxel_tests();
+
+#endif // VOXEL_TESTS_H