system: add tests for fs usage route

src/asynctask.js

@@ -6,12 +6,12 @@ const debug = require('debug')('box:asynctask'),
 
 // this runs in-process
 class AsyncTask extends EventEmitter {
-    #name;
+    name;
     #abortController;
 
     constructor(name) {
         super();
-        this.#name = name;
+        this.name = name;
         this.#abortController = new AbortController();
     }
 
@@ -20,22 +20,19 @@ class AsyncTask extends EventEmitter {
     }
 
     async start() {
-        debug(`start: ${this.#name} started`);
+        debug(`start: ${this.name} started`);
         const [error] = await safe(this._run(this.#abortController.signal)); // background
-        debug(`start: ${this.#name} done`, error);
-        this.done(error);
+        debug(`start: ${this.name} finished`);
+        this.emit('done', { errorMessage: error?.message || '' });
+        this.#abortController = null;
     }
 
     stop() {
-        debug(`stop: ${this.#name} stopped`);
+        if (this.#abortController === null) return; // already finished
+        debug(`stop: ${this.name} . sending abort signal`);
         this.#abortController.abort();
     }
 
-    done(error) {
-        debug(`done: ${this.#name} finished`);
-        this.emit('done', { errorMessage: error?.message || '' });
-    }
-
     emitProgress(percent, message) {
         this.emit('data', 'progress', { percent, message });
     }