             self.waitForExpectations(timeout: self.timeoutDuration, handler: nil)
         }
         
+        Thread.sleep(forTimeInterval: testInterval)
+        
         print("Test to give a downvote to the specified Comment.")
         do {
             var isSucceeded = false

            } catch { XCTFail((error as NSError).description) }
            self.waitForExpectations(timeout: self.timeoutDuration, handler: nil)
        }
        
        print("Check whether the downvote to the specified Comment has been revoked.")
        do {

            } catch { XCTFail((error as NSError).description) }
            self.waitForExpectations(timeout: self.timeoutDuration, handler: nil)
        }
        
        Thread.sleep(forTimeInterval: testInterval)

        print("Check whether the specified Link is gave upvote.")
        do {
