Test automation mostly using unit testing is a key feature of extreme programming and agile software development, where it is known as test-driven development (TDD) or test-first development. Unit tests can be written to define the functionality before the code is written. However, these unit tests evolve and are extended as coding progresses, issues are discovered and the code is subjected to refactoring.[5] Only when all the tests for all the demanded features pass is the code considered complete. Proponents argue that it produces software that is both more reliable and less costly than code that is tested by manual exploration.[citation needed] It is considered more reliable because the code coverage is better, and because it is run constantly during development rather than once at the end of a waterfall development cycle. The developer discovers defects immediately upon making a change, when it is least expensive to fix. Finally, code refactoring is safer when unit testing is used; transforming the code into a simpler form with less code duplication, but equivalent behavior, is much less likely to introduce new defects when the refactored code is covered by unit tests.
Building a successful automated testing strategy is tough and the approach will vary on a team-by-team basis. No team is completely identical to another. Some may consist of more manual testers than automation engineers, while some may have shifted left and depend on developers to do the heavy lifting. Budget, deadlines, application type, and development model are all factors that impact how an automated testing strategy should outlined be implemented.

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With Acceptance Test-Driven Development (ATDD), business customers, testers, and developers can collaborate to produce testable requirements that help them build higher quality software more rapidly. However, ATDD is still widely misunderstood by many practitioners. ATDD by Example is the first practical, entry-level, hands-on guide to implementing and successfully applying it.
With so many options, it can be challenging for enterprise mobility teams to choose the right solution. Whether open-source or commercial, the top mobile testing tools each have their own strengths and overall benefits. But, depending on the size of the enterprise mobility team, overall skill set and available resources, some solutions may not be the right fit for all mobile developers, testers and quality assurance professionals.

API driven testing. A testing framework that uses a programming interface to the application to validate the behaviour under test. Typically API driven testing bypasses application user interface altogether. It can also be testing public (usually) interfaces to classes, modules or libraries are tested with a variety of input arguments to validate that the results that are returned are correct.

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Chandra Kandukuri is a Technical Test Lead at Microsoft with more than 16 years of software development experience in multiple environments, developing automation frameworks and tools. He advocates the use of TDD and dedicating the time and resources to do it well. Although it is relatively uncommon to see teams utilize TDD in his experience, Kandukuri recommends the method with automated software testing because of the positive teamwork habits it can promote.
Telerik TestStudio offers perfect solution to automate desktop, web, and mobile application testing which includes UI, load, and performance testing. There are many programming languages which are supported by Telerik TestStudio. They are AJAX, HTML, ASP.NET, Silverlight, JavaScript, WPF, and MVC. It has integration with Visual Basic Studio 2010 and 2012. This tool supports cross-browser testing and has the feature of working manually as well. It has record and playback and has integration with bug tracking tools.

During my three years at Socialtext, I helped maintain a test tooling system through a user interface that was advanced for its time. O'Reilly took it as a case study in the book Beautiful Testing. The team at Socialtext uses the same framework today, although it now has several tests running at one time on Amazon's Electric Compute Cloud. Although we had a great deal of GUI-driving tests, we also had developer-facing (unit) and web services (integration) tests, a visual slideshow that testers could watch for every browser, and a strategy to explore by hand for each release. This combination of methods to reduce risk meant we found problems early.


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Selenium is used for cross-browser testing and for web-browser test automation. To use this tool, the testers must have advanced programming skills for writing complex and advanced test scripts. These skills are required to build automation frameworks and libraries for specific testing needs. Selenium is an open source tool that is commonly used by developers and testers who are well versed with programming languages such as Java, C#, Perl, Python, Scala, Groovy, PHP & Ruby.

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