unit tests: improve

and add a new one for the indexer

lib/mu-indexer.hh

@@ -74,9 +74,7 @@ public:
 	/**
 	 * Stop indexing. If not indexing, do nothing.
 	 *
-	 *
-	 * @return true if we stopped indexing, or indexing was not underway.
-	 * False otherwise.
+	 * @return true if we stopped indexing, or indexing was not underway; false otherwise.
 	 */
 	bool stop();
 
@@ -89,12 +87,10 @@ public:
 
 	// Object describing current progress
 	struct Progress {
-		void reset()
-		{
+		void reset() {
 			running = false;
 			checked = updated = removed = 0;
 		}
-
 		std::atomic<bool>   running{}; /**< Is an index operation in progress? */
 		std::atomic<size_t> checked{}; /**< Number of messages checked for changes */
 		std::atomic<size_t> updated{}; /**< Number of messages (re)parsed/added/updated */