Various black box testing are: Graph-Based testing method, Equivalence partitioning, Boundary Value Analysis, Orthogonal Array Testing.It allows to test, verify and validate the business requirement and application architecture.The primary motive of the tests is entirely to test the computer-based system.
Methods Of Testing And Debugging Hardware And Software Plc Software To FailRecovery testing To check the recovery of the software, force the software to fail in various ways. Reinitialization, check pointing mechanism, data recovery and restart are evaluated correctness. Security testing It checks the system protection mechanism and secure improper penetration. Stress testing System executes in a way which demands resources in abnormal quantity, frequency. A variation of stress testing is known as sensitivity testing. Performance testing Performance testing is designed to test run-time performance of the system in the context of an integrated system. It always combines with the stress testing and needs both hardware and software requirements. Deployment testing It is also known as configuration testing. The software works in each environment in which it is to be operated. Debugging process Debugging process is not a testing process, but it is the result of testing. The debugging process gives two results, i.e the cause is found and corrected second is the cause is not found. Debugging Strategies Debugging identifies the correct cause of error. Brute force Brute force is commonly used and least efficient method for separating the cause of software error. This method is applied when all else fails. Backtracking Backtracking is successfully used in small programs. Methods Of Testing And Debugging Hardware And Software Plc Code Is TracedThe source code is traced manually till the cause is found. Cause elimination Cause elimination establishes the concept of binary partitioning. The data related to the error occurrence is arranged in separate potential cause. Characteristics of testability Following are the characteristics of testability: 1. Operability If a better quality system is designed and implemented then it easier to test. Observability It is an ability to see which type of data is being tested. Using observability it will easily identify the incorrect output. Catch and report the internal errors automatically. Controllability If the users controlled the software properly then the testing is automated and optimized better. Decomposability The software system is constructed from independent module then tested independently. Simplicity The programs must display the functional, structural, code simplicity so that programs are easier to test. Stability Changes are rare during the testing and do not disprove existing tests. Understandability The architectural designs are well understood. The technical documentation is quickly accessible, organized and accurate. Attributes of good test The possibility of finding an error is high in good test. A test should be used for the highest probability of uncovering the errors of a complete class. The test must be executed separately and it should not be too simple nor too complex. Difference between white and black box testing White-Box Testing Black-box Testing White-box testing known as glass-box testing. In black box testing, testers may or may not be technically sound. Various white box testing methods are: Basic Path Testing and Control Structure Testing.
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