Test strategy

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Compare with Test plan.

A test strategy is an outline that describes the testing approach of the software development cycle. It is created to inform project managers, testers, and developers about some key issues of the testing process. This includes the testing objective, methods of testing new functions, total time and resources required for the project, and the testing environment.

Test strategies describe how the product risks of the stakeholders are mitigated at the test-level, which types of test are to be performed, and which entry and exit criteria apply. They are created based on development design documents. System design documents are primarily used and occasionally, conceptual design documents may be referred to. Design documents describe the functionality of the software to be enabled in the upcoming release. For every stage of development design, a corresponding test strategy should be created to test the new feature sets.

Test Levels[edit]

The test strategy describes the test level to be performed. There are primarily three levels of testing: unit testing, integration testing, and system testing. In most software development organizations, the developers are responsible for unit testing. Individual testers or test teams are responsible for integration and system testing.

Roles and Responsibilities[edit]

The roles and responsibilities of test leader, individual testers, project manager are to be clearly defined at a project level in this section. This may not have names associated: but the role has to be very clearly defined.

Testing strategies should be reviewed by the developers. They should also be reviewed by test leads for all levels of testing to make sure the coverage is complete yet not overlapping. Both the testing manager and the development managers should approve the test strategy before testing can begin.

Environment Requirements[edit]

Environment requirements are an important part of the test strategy. It describes what operating systems are used for testing. It also clearly informs the necessary OS patch levels and security updates required. For example, a certain test plan may require Windows XP Service Pack 3 to be installed as a prerequisite for testing.

Testing Tools[edit]

There are two methods used in executing test cases: manual and automated. Depending on the nature of the testing, it is usually the case that a combination of manual and automated testing is the best testing method.

Risks and Mitigation[edit]

Any risks that will affect the testing process must be listed along with the mitigation. By documenting a risk, its occurrence can be anticipated well ahead of time. Proactive action may be taken to prevent it from occurring, or to mitigate its damage. Sample risks are dependency of completion of coding done by sub-contractors, or capability of testing tools.

Test Schedule[edit]

A test plan should make an estimation of how long it will take to complete the testing phase. There are many requirements to complete testing phases. First, testers have to execute all test cases at least once. Furthermore, if a defect was found, the developers will need to fix the problem. The testers should then re-test the failed test case until it is functioning correctly. Last but not the least, the tester need to conduct regression testing towards the end of the cycle to make sure the developers did not accidentally break parts of the software while fixing another part. This can occur on test cases that were previously functioning properly.

The test schedule should also document the number of testers available for testing. If possible, assign test cases to each tester.

It is often difficult to make an accurate estimate of the test schedule since the testing phase involves many uncertainties. Planners should take into account the extra time needed to accommodate contingent issues. One way to make this approximation is to look at the time needed by the previous releases of the software. If the software is new, multiplying the initial testing schedule approximation by two is a good way to start.

Regression Test Approach[edit]

When a particular problem is identified, the programs will be debugged and the fix will be done to the program. To make sure that the fix works, the program will be tested again for that criteria. Regression test will make sure that one fix does not create some other problems in that program or in any other interface. So, a set of related test cases may have to be repeated again, to make sure that nothing else is affected by a particular fix. How this is going to be carried out must be elaborated in this section. In some companies, whenever there is a fix in one unit, all unit test cases for that unit will be repeated, to achieve a higher level of quality.

Test Groups[edit]

From the list of requirements, we can identify related areas, whose functionality is similar. These areas are the test groups. For example, in a railway reservation system, anything related to ticket booking is a functional group; anything related with report generation is a functional group. Same way, we have to identify the test groups based on the functionality aspect.

Test Priorities[edit]

Among test cases, we need to establish priorities. While testing software projects, certain test cases will be treated as the most important ones and if they fail, the product cannot be released. Some other test cases may be treated like cosmetic and if they fail, we can release the product without much compromise on the functionality. This priority levels must be clearly stated. These may be mapped to the test groups also.

Test Status Collections and Reporting[edit]

When test cases are executed, the test leader and the project manager must know, where exactly the project stands in terms of testing activities. To know where the project stands, the inputs from the individual testers must come to the test leader. This will include, what test cases are executed, how long it took, how many test cases passed, how many failed, and how many are not executable. Also, how often the project collects the status is to be clearly stated. Some projects will have a practice of collecting the status on a daily basis or weekly basis.

Test Records Maintenance[edit]

When the test cases are executed, we need to keep track of the execution details like when it is executed, who did it, how long it took, what is the result etc. This data must be available to the test leader and the project manager, along with all the team members, in a central location. This may be stored in a specific directory in a central server and the document must say clearly about the locations and the directories. The naming convention for the documents and files must also be mentioned.

Requirements traceability matrix[edit]

Main article: Traceability matrix

Ideally, the software must completely satisfy the set of requirements. From design, each requirement must be addressed in every single document in the software process. The documents include the HLD, LLD, source codes, unit test cases, integration test cases and the system test cases. In a requirements traceability matrix, the rows will have the requirements. The columns represent each document. Intersecting cells are marked when a document addresses a particular requirement with information related to the requirement ID in the document. Ideally, if every requirement is addressed in every single document, all the individual cells have valid section ids or names filled in. Then we know that every requirement is addressed. If any cells are empty, it represents that a requirement has not been correctly addressed.

Test Summary[edit]

The senior management may like to have test summary on a weekly or monthly basis. If the project is very critical, they may need it even on daily basis. This section must address what kind of test summary reports will be produced for the senior management along with the frequency.

The test strategy must give a clear vision of what the testing team will do for the whole project for the entire duration. This document can be presented to the client, if needed. The person, who prepares this document, must be functionally strong in the product domain, with very good experience, as this is the document that is going to drive the entire team for the testing activities. Test strategy must be clearly explained to the testing team members right at the beginning of the project.

See also[edit]

References[edit]

  • Ammann, Paul and Offutt, Jeff. Introduction to software testing. New York: Cambridge University Press, 2008
  • Bach, James (1999). "Test Strategy". Retrieved October 31, 2011. 
  • Dasso, Aristides. Verification, validation and testing in software engineering. Hershey, PA: Idea Group Pub., 2007