feature (unity): added memory leak check API, integrated it into cxx tests

components/unity/unity_utils_memory.c

@@ -0,0 +1,46 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdio.h>
+#include "unity.h"
+#include "unity_test_utils.h"
+
+static size_t s_allowed_leak_level;
+
+void unity_utils_set_leak_level(size_t leak_level)
+{
+    s_allowed_leak_level = leak_level;
+}
+
+void unity_utils_check_leak(unsigned int before_free,
+        unsigned int after_free,
+        const char *type,
+        unsigned int threshold)
+{
+    int free_delta = (int)after_free - (int)before_free;
+    printf("MALLOC_CAP_%s usage: Free memory delta: %d Leak threshold: -%u \n",
+           type,
+           free_delta,
+           threshold);
+
+    if (free_delta > 0) {
+        return; // free memory went up somehow
+    }
+
+    unsigned int leaked = (size_t)(free_delta * -1);
+
+    printf("MALLOC_CAP_%s %s leak: Before %u bytes free, After %u bytes free (delta %u)\n",
+           type,
+           leaked <= threshold ? "potential" : "critical",
+           before_free, after_free, leaked);
+    fflush(stdout);
+    TEST_ASSERT_MESSAGE(leaked <= threshold, "The test leaked too much memory");
+}
+
+void unity_utils_evaluate_leaks(void)
+{
+    unity_utils_evaluate_leaks_direct(s_allowed_leak_level);
+}