What is Black Box Testing?

• Test the correctness of the functionality with the help of Inputs and Outputs.
• User doesn’t require the knowledge of software code.
• Black box testing is also called as Functionality Testing.
• Testers make sure that software is working as per the requirements.

It attempts to find errors in the following categories:

• Incorrect or missing functions.
• Interface errors.
• Errors in data structures or external data base access.
• Behavior or performance based errors.
• Initialization or termination errors.

Read – Approaches used in Black Box Testing

Fault : It is a condition that causes the software to fail to perform its required function.
Error : Refers to difference between Actual Output and Expected output.
Failure : It is the inability of a system or component to perform required function according to its specification.
IEEE Definitions

• Failure: External behavior is incorrect
• Fault: Discrepancy in code that causes a failure.
• Error: Human mistake that caused fault

Note:

• Error is terminology of Developer.
• Bug is terminology of Tester

Definitions of Software Testing –

• It is the process of Creating, Implementing and Evaluating tests.
• Testing measures software quality
• Testing can find faults. When they are removed, software quality is improved.
• Testing is executing a program with an indent of finding Error/Fault and Failure.
• IEEE Terminology : An examination of the behavior of the program by executing on sample data sets.

1. To discover defects.
2. To avoid user detecting problems
3. To prove that the software has no faults
4. To learn about the reliability of the software.
5. To avoid being sued by customers
6. To ensure that product works as user expected.
7. To stay in business
8. To detect defects early, which helps in reducing the cost of defect fixing?

Read – Why start testing early?