66 QA interview questions and answers(Part 8)

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Q62 Why regression testing is important?

Regression Testing: When changes in the code of the software are made to fix the previous bug. Then testing needs to be perform to ensure that it will not generate a new bug in the application and it works as specified and that it has not negatively impacted any functionality that it offered previously. Regression Testing is important because of following reason:
  • That the application works even after the alteration in the code were made.
  • The original functionality continues to work as specified even after doing changes in the software application.
  • The alteration to the software application has not introduced any new bugs.

Q63. What is Exploratory Testing and Specification-Driven testing?

Exploratory testing: means testing an application without a test plan and test script. In exploring testing test explore the application on the basis on his knowledge. The tester has no knowledge about the application previously. He explores the application like an end user and try to use it. While using the application his main motive is to find the bugs which are in the application.

Specification-driven testing: means to test the functionality of software according to the user requirements. In this, tester inputs multiple data and monitors the outputs from, the test object. In this testing tester evaluate the showstopper bugs which break the major functionality of the application. This type of testing requires test plan and test.

Q64. Explain CMM.

Capability Maturity Model (CMM) is divided in five levels:
1. Initial: The organization is characterized by an adhoc set of activities. The processes aren't defined and success depends on individual effort and heroics.
2. Repeatable: In this level some processes are repeatable, possibly with consistent results.
3. Defined: In this level, we define all processes are documented for both management and engineering activities, and standards.
4. Managed: Detailed measures of each process are defined and product quality data is routinely collected. Both process and products are quantitatively understood and controlled.
5. Optimizing: In this we optimize the application by following improvement process.

Q65. How do you decide you have tested enough?

The principle of testing says that exhaustive testing is impossible. i.e. testing everything is not feasible. We cannot test till all the defects are debugged and removed, it is simply impossible. We have to stop testing and ship the software. We can decide when to stop is testing based on following points:
  • When there is no time and budget.
  • When maximum number of test cases are executed.
  • All the Requirements are mapped that is RTM is filled completely.
  • When Test coverage is more than 80%.
  • When bug rate falls below certain level.

Q66. What the purpose of testing?

Software Testing: is the process of assuring that product which is developed by the manufactured by developer is meeting the user requirement. The motive to perform testing is to find the bugs and make sure that they get fixed. The purposes of testing are following:
  • Quality assurance, Verification and Validation,
  • To find the bugs before the product is released to customer.
  • To improve the quality of the product
  • The Purpose of Testing is to evaluate that the product is according to requirements
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