49 Facts About Software testing

Software testing is the act of examining the artifacts and the behavior of the software under test by validation and verification.

Software testing can provide an objective, independent view of the software to allow the business to appreciate and understand the risks of software implementation.

Software testing can provide objective, independent information about the quality of software and risk of its failure to users or sponsors.

Software testing faults occur through the following process: A programmer makes an error, which results in a fault in the software source code.

Fundamental problem with software testing is that testing under all combinations of inputs and preconditions is not feasible, even with a simple product.

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Software testing can be done by dedicated software testers; until the 1980s, the term "software tester" was used generally, but later it was seen as a separate profession.

Passive testing means verifying the system behavior without any interaction with the software product.

Contrary to active Software testing, testers do not provide any test data but look at system logs and traces.

Exploratory testing is an approach to software testing that is concisely described as simultaneous learning, test design, and test execution.

Software testing methods are traditionally divided into white- and black-box testing.

Specification-based testing aims to test the functionality of software according to the applicable requirements.

Component interface Software testing is a variation of black-box Software testing, with the focus on the data values beyond just the related actions of a subsystem component.

The practice of component interface Software testing can be used to check the handling of data passed between various units, or subsystem components, beyond full integration Software testing between those units.

One option for interface Software testing is to keep a separate log file of data items being passed, often with a timestamp logged to allow analysis of thousands of cases of data passed between units for days or weeks.

Aim of visual testing is to provide developers with the ability to examine what was happening at the point of software failure by presenting the data in such a way that the developer can easily find the information she or he requires, and the information is expressed clearly.

At the core of visual Software testing is the idea that showing someone a problem, rather than just describing it, greatly increases clarity and understanding.

Visual Software testing, therefore, requires the recording of the entire test process – capturing everything that occurs on the test system in video format.

Grey-box Software testing involves having knowledge of internal data structures and algorithms for purposes of designing tests while executing those tests at the user, or black-box level.

Unit Software testing refers to tests that verify the functionality of a specific section of code, usually at the function level.

Unit testing is a software development process that involves a synchronized application of a broad spectrum of defect prevention and detection strategies in order to reduce software development risks, time, and costs.

Unit testing aims to eliminate construction errors before code is promoted to additional testing; this strategy is intended to increase the quality of the resulting software as well as the efficiency of the overall development process.

Integration testing is any type of software testing that seeks to verify the interfaces between components against a software design.

Contractual acceptance testing is performed based on the contract's acceptance criteria defined during the agreement of the contract, while regulatory acceptance testing is performed based on the relevant regulations to the software product.

Regulation acceptance Software testing sometimes involves the regulatory agencies auditing the test results.

Sanity Software testing determines whether it is reasonable to proceed with further Software testing.

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Regression Software testing focuses on finding defects after a major code change has occurred.

Regression testing is typically the largest test effort in commercial software development, due to checking numerous details in prior software features, and even new software can be developed while using some old test cases to test parts of the new design to ensure prior functionality is still supported.

Common methods of regression Software testing include re-running previous sets of test cases and checking whether previously fixed faults have re-emerged.

The depth of Software testing depends on the phase in the release process and the risk of the added features.

In regression Software testing, it is important to have strong assertions on the existing behavior.

Alpha testing is often employed for off-the-shelf software as a form of internal acceptance testing before the software goes to beta testing.

Functional Software testing refers to activities that verify a specific action or function of the code.

Continuous testing is the process of executing automated tests as part of the software delivery pipeline to obtain immediate feedback on the business risks associated with a software release candidate.

Continuous Software testing includes the validation of both functional requirements and non-functional requirements; the scope of Software testing extends from validating bottom-up requirements or user stories to assessing the system requirements associated with overarching business goals.

Various commercial non-functional testing tools are linked from the software fault injection page; there are numerous open-source and free software tools available that perform destructive testing.

Performance Software testing is generally executed to determine how a system or sub-system performs in terms of responsiveness and stability under a particular workload.

Load Software testing is primarily concerned with Software testing that the system can continue to operate under a specific load, whether that be large quantities of data or a large number of users.

Volume testing is a way to test software functions even when certain components increase radically in size.

Stress Software testing is a way to test reliability under unexpected or rare workloads.

Usability Software testing is to check if the user interface is easy to use and understand.

Security testing is essential for software that processes confidential data to prevent system intrusion by hackers.

Concurrent or concurrency testing assesses the behaviour and performance of software and systems that use concurrent computing, generally under normal usage conditions.

Property Software testing is a Software testing technique where, instead of asserting that specific inputs produce specific expected outputs, the practitioner randomly generates many inputs, runs the program on all of them, and asserts the truth of some "property" that should be true for every pair of input and output.

Property Software testing libraries allow the user to control the strategy by which random inputs are constructed, to ensure coverage of degenerate cases, or inputs featuring specific patterns that are needed to fully exercise aspects of the implementation under test.

Metamorphic testing is a property-based software testing technique, which can be an effective approach for addressing the test oracle problem and test case generation problem.

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However, even in the waterfall development model, unit testing is often done by the software development team even when further testing is done by a separate team.

The inclusion into Class I does not require the simplicity of the assumed computation model, as some testing cases involving implementations written in any programming language, and testing implementations defined as machines depending on continuous magnitudes, have been proved to be in Class I Other elaborated cases, such as the testing framework by Matthew Hennessy under must semantics, and temporal machines with rational timeouts, belong to Class II.

Software testing is used in association with verification and validation:.

Software testing is an activity to investigate software under test in order to provide quality-related information to stakeholders.