Mockito Tutorial: Learn mocking with 25 Junit Examples - Step 16: Invoking Private Methods

This video tutorial explains how to test private methods in Java using PowerMock and Mockito. It covers the setup process, invoking private methods with PowerMock's Whitebox utility, and handling exceptions during testing. The tutorial emphasizes the use of these techniques in legacy systems where refactoring is not feasible. The video concludes with a successful test execution, demonstrating the effectiveness of the approach.

Why might it be necessary to test private methods in a legacy system?

• To reduce code complexity

• To enhance user interface design

• To improve public method performance

• To avoid refactoring the system

What is the first step in setting up a test for a private method using PowerMock?

• Mocking all static methods

• Renaming the test class

• Removing unnecessary static mocks

• Creating a new utility class

Which utility class is used by PowerMock to invoke private methods?

• Whitebox

• Blackbox

• Graybox

• Sandbox

What is the purpose of the Whitebox.invokeMethod in PowerMock?

• To delete private methods

• To rename private methods

• To create new private methods

• To invoke private or inner class methods

How should exceptions be handled when invoking a private method in a test?

• By converting them to warnings

• By ignoring them

• By allowing them to be thrown

• By logging them silently

What is the result of the private method test in the tutorial?

• 150

• 6

• 3

• 9

What combination of tools is used to test private methods in the tutorial?

• JUnit and Mockito

• PowerMock and JUnit

• PowerMock and Mockito

• Mockito and TestNG