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

components/unity/include/unity_test_utils_cache.h

@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Disable flash cache and run user stub function and then enable flash cache again
+ *
+ * @note You should make sure the passed-in function is in internal RAM.
+ *
+ * @param post_cache_disable User function to be invoked after cache is disabled.
+ * @param user_ctx User context to be passed to user function.
+ */
+void unity_utils_run_cache_disable_stub(void (*post_cache_disable)(void *), void *user_ctx);
+
+#ifdef __cplusplus
+}
+#endif