Fix the worker run test

Description

Fixes the worker#run test failing sometimes because of race conditions.

Changes

Changes the worker test so it mocks out threading.

Additions

Adds a new method to the Threads helper that spawns un-managed threads.

Test and Review

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such

src/main/java/nl/tudelft/ewi/auta/common/threads/Threads.java

@@ -193,6 +193,17 @@ public class Threads {
         return this.scheduledExecutor.scheduleWithFixedDelay(this.wrap(task), delay, delay, unit);
     }
 
+    /**
+     * Submits a task as a separate, unmanaged and unpooled thread.
+     *
+     * @param runnable the task to execute
+     *
+     * @return the thread executing the task
+     */
+    public Thread asThread(final UnsafeRunnable runnable) {
+        return new Thread(this.wrap(runnable));
+    }
+
     /**
      * Wraps an unsafe runnable into a runnable that will catch the exceptions it could throw.
      *