feat(linux): added fls() on Linux

components/linux/test_apps/linux_test/main/linux_test.c

@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "unity.h"
+#include "unity_test_runner.h"
+#include "unity_test_utils_memory.h"
+#include "esp_log.h"
+#include <strings.h>
+
+static const char* TAG = "event_test_app";
+
+void setUp(void)
+{
+    // If heap tracing is enabled in kconfig, leak trace the test
+    unity_utils_set_leak_level(0);
+    unity_utils_record_free_mem();
+}
+
+void tearDown(void)
+{
+    unity_utils_evaluate_leaks();
+}
+
+TEST_CASE("fls(0) = 0", "[fls]")
+{
+    TEST_ASSERT_EQUAL(0, fls(0));
+}
+
+TEST_CASE("fls(1) = 1", "[fls]")
+{
+    TEST_ASSERT_EQUAL(1, fls(1));
+}
+
+TEST_CASE("fls(0xF000) = 16", "[fls]")
+{
+    TEST_ASSERT_EQUAL(16, fls(0xF000));
+}
+
+TEST_CASE("fls(0x80000000) = 32", "[fls]")
+{
+    TEST_ASSERT_EQUAL(32, fls(0x80000000));
+}
+
+void app_main(void)
+{
+    ESP_LOGI(TAG, "Running linux test app");
+    unity_run_menu();
+}