unity_utils: added helper function to disable cache and run user function

components/unity/unity_utils_cache.c

@@ -0,0 +1,22 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "unity.h"
+#include "unity_test_utils_cache.h"
+#include "esp_attr.h"
+#include "esp_memory_utils.h"
+#include "esp_private/spi_flash_os.h"
+
+IRAM_ATTR void unity_utils_run_cache_disable_stub(void (*post_cache_disable)(void *), void *user_ctx)
+{
+    // callback function must reside in IRAM
+    TEST_ASSERT_TRUE(esp_ptr_in_iram(post_cache_disable));
+    // disable flash cache
+    spi_flash_guard_get()->start();
+    post_cache_disable(user_ctx);
+    // enable flash cache
+    spi_flash_guard_get()->end();
+}