Fill in the blank below.

Let's say you're working on a banking application, and you have a class called Account that represents a bank account. The Account class has methods for depositing money $($deposit$())$ and withdrawing money $($withdraw$()),$ as well as a method for retrieving the account balance $($getBalance$()).$

You complete the following steps:

Create an instance of the Account class.

Call the deposit$()$ method with a positive amount, let's say $$100.$

Use an assertion to verify that the account balance is updated correctly by calling the getBalance$()$ method and checking if it returns $$100.$

This scenario is an example of $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ testing.

$*$Please write your answer in lowercase and ensure spelling is correct.