Fix failing test

src/taskworker.js

@@ -31,7 +31,7 @@ const TASKS = { // indexed by task type
 
     _identity: async (arg, progressCallback) => { progressCallback(); return arg; },
     _error: async (arg, progressCallback) => { progressCallback(); throw new Error(`Failed for arg: ${arg}`); },
-    _crash: async (arg) => { throw new Error(`Crashing for arg: ${arg}`); }, // the test looks for this debug string in the log file
+    _crash: (arg) => { throw new Error(`Crashing for arg: ${arg}`); }, // the test looks for this debug string in the log file
     _sleep: async (arg) => setTimeout(process.exit, arg)
 };