Error Handling Testing(容错性测试)

Error handling refers to the anticipation, detection, and resolution of programming, applicaition and communications errors. Specialized programs, called error handlers, are available for some applications. The best programs of this type forestall errors if possible, recover from them when they occur without terminating the application, or (if all else fails) gracefully terminate an affected application and save the error information to a log file.

In programming, a development error is one that can be prevented. Such an error can occur in syntax or logic. Syntax errors, which are typographical mistakes or improper use of special characters, are handled by rigorous proofreading. Logic errors, also called bugs, occur when executed code does not produce the expected or desired result. Logic errors are best handled by meticulous program debugging. This can be an ongoing process that involves, in addition to the traditional debugging routine, beta testing prior to official release and customer feedback after official release.

A run-time error takes place during the execution of a program, and usually happens because of adverse system parameters or invalid input data. An example is the lack of sufficient memory to run an application or a memory conflict with another program. On the Internet, run-time errors can result from electrical noise, various forms of malware or an exceptionally heavy demand on a server. Run-time errors can be resolved, or their impact minimized, by the use of error handler programs, by vigilance on the part of network and server administrators, and by reasonable security countermeasures on the part of Internet users.

Usage

• It determines the ability of applications system to process the incorrect transactions properly
  
• Errors encompass all unexpected conditions.
  
• In some system approx. 50% of programming effort will be devoted to handling error condition.

Objective

 

• Determine Application system recognizes all expected error conditions.
  
• Determine Accountability of processing errors has been assigned and procedures provide a high probability that errors will be properly corrected.
  
• Determine During correction process reasonable control is maintained over errors.

How to Use

• A group of knowledgeable people is required to anticipate what can go wrong in the application system.
  
• It is needed that all the application knowledgeable people assemble to integrate their knowledge of user area, auditing and error tracking.
  
• Then logical test error conditions should be created based on this assimilated information.

When to Use

• Throughout SDLC.
  
• Impact from errors should be identified and should be corrected to reduce the errors to acceptable level.
  
• Used to assist in error management process of system development and maintenance.

Example

• Create a set of erroneous transactions and enter them into the application system then find out whether the system is able to identify the problems.
• Using iterative testing enters transactions and trap errors. Correct them. Then enter transactions with errors, which were not present in the system earlier.