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basic testing qtn&ans

basic testing qtn&ans

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Published by: api-3772931 on Oct 16, 2008
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What is 'Software Quality Assurance'?

Software QA involves the entire software development PROCESS - monitoring and improving the process, making sure that any agreed-upon standards and procedures are followed, and ensuring that problems are found and dealt with. It is oriented to 'prevention'. What is 'Software Testing'? Testing involves operation of a system or application under controlled conditions and evaluating the results (e.g. 'if the user is in interface A of the application while using hardware B, and does C, then D should happen'). The controlled conditions should include both normal and abnormal conditions. Testing should intentionally attempt to make things go wrong to determine if things happen when they shouldn't or things don't happen when they should. It is oriented to 'detection'. Organizations vary considerably in how they assign responsibility for QA and testing. Sometimes they're the combined responsibility of one group or individual. Also common are project teams that include a mix of testers and developers who work closely together, with overall QA processes monitored by project managers. It will depend on what best fits an organization's size and business structure. Why does software have bugs? • Miscommunication or no communication - as to specifics of what an application should or shouldn't do (the application's requirements). • Software complexity • Programming errors - programmers, like anyone else, can make mistakes. • Changing • Time pressures - scheduling of software projects is difficult at best, often requiring a lot of guesswork. When deadlines loom and the crunch comes, mistakes will be made. • Egos • Poorly documented code • Software development tools - visual tools, class libraries, compilers, scripting tools, etc. often introduce their own bugs or are poorly documented, resulting in added bugs. What is Verification? Validation? Verification typically involves reviews and meetings to evaluate documents, plans, code, requirements, and specifications. This can be done with checklists, issues lists, walkthroughs, and inspection meetings. Validation typically involves actual testing and takes place after verifications are completed. The term 'IV & V' refers to Independent Verification and Validation. What is a 'walkthrough'? A 'walkthrough' is an informal meeting for evaluation or informational purposes. Little or no preparation is usually required. What's an 'inspection'? An inspection is more formalized than a 'walkthrough', typically with 3-8 people including a moderator, reader, and a recorder to take notes. What kinds of testing should be considered? • Black box testing - not based on any knowledge of internal design or code. Tests are based on requirements and functionality. • White box testing - based on knowledge of the internal logic of an application's code. Tests are based on coverage of code statements, branches, paths, conditions. • Unit testing - the most 'micro' scale of testing; to test particular functions or code modules. Typically done by the programmer and not by testers, as it requires detailed knowledge of the internal program design and code. Not always easily done unless the application has a well-designed architecture with tight code; may require developing test driver modules or test harnesses. • Incremental integration testing - continuous testing of an application as new functionality is added; requires that various aspects of an application's functionality be independent enough to work separately before all parts of the program are

completed, or that test drivers be developed as needed; done by programmers or by testers. • Integration testing - testing of combined parts of an application to determine if they function together correctly. The 'parts' can be code modules, individual applications, client and server applications on a network, etc. This type of testing is especially relevant to client/server and distributed systems. • Functional testing - black box type testing geared to functional requirements of an application; this type of testing should be done by testers. This doesn't mean that the programmers shouldn't check that their code works before releasing it (which of course applies to any stage of testing.) • System testing - black box type testing that is based on overall requirements specifications; covers all combined parts of a system. • End-to-End testing - similar to system testing; the 'macro' end of the test scale; involves testing of a complete application environment in a situation that mimics real-world use, such as interacting with a database, using network communications, or interacting with other hardware, applications, or systems if appropriate. • Sanity testing - typically an initial testing effort to determine if a new software version is performing well enough to accept it for a major testing effort. For example, if the new software is crashing systems every 5 minutes, bogging down systems to a crawl, or destroying databases, the software may not be in a 'sane' enough condition to warrant further testing in its current state. • Regression testing - re-testing after fixes or modifications of the software or its environment. It can be difficult to determine how much re-testing is needed, especially near the end of the development cycle. Automated testing tools can be especially useful for this type of testing. • Acceptance testing - final testing based on specifications of the end-user or customer, or based on use by end-users/customers over some limited period of time. • Load testing - testing an application under heavy loads, such as testing of a web site under a range of loads to determine at what point the system's response time degrades or fails. • Stress testing - term often used interchangeably with 'load' and 'performance' testing. Also used to describe such tests as system functional testing while under unusually heavy loads, heavy repetition of certain actions or inputs, input of large numerical values, large complex queries to a database system, etc. • Performance testing - term often used interchangeably with 'stress' and 'load' testing. Ideally 'performance' testing (and any other 'type' of testing) is defined in requirements documentation or QA or Test Plans. • Usability testing - testing for 'user-friendliness'. Clearly this is subjective, and will depend on the targeted end-user or customer. User interviews, surveys, video recording of user sessions, and other techniques can be used. Programmers and testers are usually not appropriate as usability testers. • Install/uninstall testing - testing of full, partial, or upgrade install/uninstall processes. • Recovery testing - testing how well a system recovers from crashes, hardware failures, or other catastrophic problems. • Security testing - testing how well the system protects against unauthorized internal or external access, willful damage, etc; may require sophisticated testing techniques. • Compatibility testing - testing how well software performs in a particular hardware/software/operating system/network/etc. environment. • Exploratory testing - often taken to mean a creative, informal software test that is not based on formal test plans or test cases; testers may be learning the software as they test it. • Ad-hoc testing - similar to exploratory testing, but often taken to mean that the testers have significant understanding of the software before testing it. • User acceptance testing - determining if software is satisfactory to an end-user

or customer. • Comparison testing - comparing software weaknesses and strengths to competing products. • Alpha testing - testing of an application when development is nearing completion; minor design changes may still be made as a result of such testing. Typically done by end-users or others, not by programmers or testers. • Beta testing - testing when development and testing are essentially completed and final bugs and problems need to be found before final release. Typically done by end-users or others, not by programmers or testers. • Mutation testing - a method for determining if a set of test data or test cases is useful, by deliberately introducing various code changes ('bugs') and retesting with the original test data/cases to determine if the 'bugs' are detected. Proper implementation requires large computational resources. What is software 'quality'? Quality software is reasonably bug-free, delivered on time and within budget, meets requirements and/or expectations, and is maintainable. What is 'good code'? 'Good code' is code that works, is bug free, and is readable and maintainable. What is 'good design'? 'Design' could refer to many things, but often refers to 'functional design' or 'internal design'. What is SEI? CMM? ISO? IEEE? ANSI? Will it help? • SEI = 'Software Engineering Institute' at Carnegie-Mellon University; initiated by the U.S. Defense Department to help improve software development processes. • CMM = 'Capability Maturity Model', developed by the SEI. • ISO = 'International Organization for Standardization' • IEEE = 'Institute of Electrical and Electronics • ANSI = 'American National Standards • Other software development process assessment methods besides CMM and ISO 9000 include SPICE, Trillium, Tick IT and Bootstrap. What is the 'software life cycle'? The life cycle begins when an application is first conceived and ends when it is no longer in use. It includes aspects such as initial concept, requirements analysis, functional design, internal design, documentation planning, test planning, coding, document preparation, integration, testing, maintenance, updates, retesting, phaseout, and other aspects. Regression Testing : Regression testing is re-testing of a previously tested program following modification to ensure that faults have not been introduced or uncovered as a result of the changes made. Regression tests are designed for repeatability, and are often used when testing a second or later version of the System Under Test (SUT). Automated regression testing is a benefit of test automation. Building an automated test system is in fact a software development process. SIM works alongside the client to select suitable cases for regression testing, such as: • • • • Tests Tests Tests Tests that cover business critical functions that are repetitive that need accurate data for areas that change regularly.

Functional Testing Functional testing is testing that operations perform as expected. Functionality is assessed from two perspectives - the first is to prove and accept the product and the second is to test the business acceptance. Functional tests are often

based on an external requirements definition.

SIM offers a full functional testing service, and have expertise in all aspects of functional testing, both manual and automated. SIM will provide the following functional testing services: • • • • • Identify functions to be tested for both online and cyclic batch processes Liaise with the business representatives to prioritise the tests identify data to exercise fully the functions to be tested Specify the results expected from every test Produce automated or manual test scripts that will apply the test data.


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