Apply suggestions from code review

Co-authored-by: Krzysztof Wolski <krzysztof.k.wolski@gmail.com>

src/containers/BackgroundTasks/BackgroundTasksProvider.test.tsx

@@ -133,19 +133,24 @@ describe("Background task provider", () => {
   it("can queue multiple tasks", done => {
     let cycle = 0;
 
-    const tasks: TaskData[] = [
-      {
+    // during 2 cycle it should be complete
+    const shortTask = {
         handle: jest.fn(() =>
           Promise.resolve(cycle > 1 ? TaskStatus.SUCCESS : TaskStatus.PENDING)
         ),
         onCompleted: jest.fn()
-      },
-      {
+      };
+
+    // long task will be completed after 3 cicle
+    const longTask = {
         handle: jest.fn(() =>
           Promise.resolve(cycle > 2 ? TaskStatus.SUCCESS : TaskStatus.PENDING)
         ),
         onCompleted: jest.fn()
-      }
+    };
+    const tasks: TaskData[] = [
+      shortTask,
+      longTask
     ];
 
     const { result } = renderBackgroundTasks();
@@ -167,10 +172,10 @@ describe("Background task provider", () => {
       jest.advanceTimersByTime(backgroundTasksRefreshTime);
 
       setImmediate(() => {
-        expect(tasks[0].handle).toHaveBeenCalledTimes(2);
-        expect(tasks[1].handle).toHaveBeenCalledTimes(2);
-        expect(tasks[0].onCompleted).toHaveBeenCalledTimes(1);
-        expect(tasks[1].onCompleted).toHaveBeenCalledTimes(0);
+        expect(shortTask.handle).toHaveBeenCalledTimes(2);
+        expect(longTask.handle).toHaveBeenCalledTimes(2);
+        expect(shortTask.onCompleted).toHaveBeenCalledTimes(1);
+        expect(longTask.onCompleted).toHaveBeenCalledTimes(0);
 
         // Set time to backgroundTasksRefreshTime * 3
         cycle += 1;