Unit testing is one of the key step in software development life cycle. It is one of the first checks to verify the code quality. Most of the basic functionalities can be tested with unit test cases. They are quick and take little time to execute. We discussed both JUnit framework and TestNG framework to unit test the code. The next step in the quality check process is integration testing. As by general definition of unit testing, you divide your code into small units and test them independently, which is good when you are developing your code independently. Once you commit the code and integrate the code with other developers, you need another level of testing, which is known as integration testing. It verifies the communication between different components working together as expected or not. Your test reports might give 100 percent success results in unit testing, but unless and until you perform integration testing, you cannot be assured of the functionality of the...