Overview
This tutorial will teach different types of Black Box Testing Techniques. In Black box testing, the QA Team doesn’t know the internal working and implementation of the application under test.
Black-box test cases are designed from an examination of the input/output values, and no internal knowledge of source code is required. The testing team knows the test inputs to the application and the expected outcomes of the tests. Most of the manual functional testing is black-box testing.
Black Box Testing Techniques
Some of the important Black Box Testing Techniques are as follows:
- Error Guessing
- Boundary Value Analysis(BVA)
- Equivalence Class Partitioning(ECP)
- Comparison Testing
- All Pairs Testing
- Decision Table Testing
- Fuzzy Testing
- State Transition Testing
- Risk-based Testing
- Graph-based Testing
- Orthogonal Array Testing
- Use Case Testing
Error guessing
Error guessing is a black-box testing technique where the tester’s experience, intuition, and understanding of the system’s potential failure points guide the testing process. Unlike systematic techniques like boundary value analysis or equivalence partitioning, error guessing does not follow a specific, documented procedure. Instead, it relies on the tester’s skills, creativity, and past experiences to identify potential errors in the system.
Equivalence Class Partitioning
Equivalence Class Partitioning(ECP) is a technique that divides the input domain of the software into several equivalent classes, such that each class represents a set of inputs that produce the same output or behavior. The idea is to select one representative input from each class and test it instead of testing all the possible inputs. This can reduce the number of test cases and save time and resources.
Boundary Value Analysis
Boundary Value Analysis(BVA) is a technique that tests the boundary values or limits of the input domain of the software. It is based on the assumption that errors are more likely to occur at the edges of the input range than in the middle. Therefore, it is crucial to test the values at or near the boundaries, such as minimum, maximum, just above, just below, or on the boundary.
Decision Table Testing
Decision table testing is a powerful technique that uses a table to represent a software application’s logical conditions and actions. It helps in testing complex scenarios that involve multiple inputs and outputs. The table consists of rows and columns where each row represents a test case, and each column represents either a condition or an action. This technique enables testers to visualize and evaluate how the software should behave for different combinations of inputs and outputs. Overall, decision table testing helps ensure the software functions as expected and meets all the requirements.
State Transition Testing
State transition testing is a technique used to test how software changes its state based on various events or inputs. It is particularly useful for testing software that has different modes or states that are dependent on the previous events or inputs. We can use a state transition diagram to model the states and transitions of the software.
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