tests: logging/log_api: add bits to test backend events

This adds a few bits to the log_api tests to test backend
event notifications.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

tests/subsys/logging/log_api/src/mock_backend.c

@@ -102,6 +102,11 @@ void mock_log_backend_validate(const struct log_backend *backend, bool panic)
 	zassert_equal(mock->msg_rec_idx, mock->msg_proc_idx,
 			"%p Recored:%d, Got: %d", mock, mock->msg_rec_idx, mock->msg_proc_idx);
 	zassert_equal(mock->panic, panic, NULL);
+
+#if defined(CONFIG_LOG_MODE_DEFERRED) && \
+	defined(CONFIG_LOG_PROCESS_THREAD)
+	zassert_true(mock->evt_notified, NULL);
+#endif
 }
 
 struct test_str {
@@ -200,9 +205,26 @@ static void dropped(const struct log_backend *const backend, uint32_t cnt)
 }
 
 
+#if defined(CONFIG_LOG_MODE_DEFERRED) && \
+	defined(CONFIG_LOG_PROCESS_THREAD)
+static void notify(const struct log_backend *const backend,
+		   enum log_backend_evt event,
+		   union log_backend_evt_arg *arg)
+{
+	struct mock_log_backend *mock = backend->cb->ctx;
+
+	mock->evt_notified = true;
+}
+#endif
+
 const struct log_backend_api mock_log_backend_api = {
 	.process = process,
 	.panic = panic,
 	.init = mock_init,
 	.dropped = IS_ENABLED(CONFIG_LOG_MODE_IMMEDIATE) ? NULL : dropped,
+
+#if defined(CONFIG_LOG_MODE_DEFERRED) && \
+	defined(CONFIG_LOG_PROCESS_THREAD)
+	.notify = notify,
+#endif
 };

tests/subsys/logging/log_api/src/mock_backend.h

@@ -34,6 +34,11 @@ struct mock_log_backend {
 	int msg_proc_idx;
 	int exp_drop_cnt;
 	int drop_cnt;
+
+#if defined(CONFIG_LOG_MODE_DEFERRED) && \
+	defined(CONFIG_LOG_PROCESS_THREAD)
+	bool evt_notified;
+#endif
 };
 
 void mock_log_backend_reset(const struct log_backend *backend);