Test coverage in software testing

In software testing, test coverage measures the amount of testing performed by a set of test. It will include gathering information about which parts of a program are actually executed when running the test suite in order to determine which branches of conditional statements have been taken.

In simple terms, it is a technique to ensure that your tests are actually testing your code or how much of your code you exercised by running the test.

What Test Coverage does

  • Finding area of a requirement not implemented by a set of test cases
  • Helps to create additional test cases to increase coverage
  • Identifying a quantitative measure of test coverage, which is an indirect method for quality check
  • Identifying meaningless test cases that do not increase coverage

How Test Coverage can be accomplished?

  • Test coverage can be done by exercising the static review techniques like peer reviews, inspections and walkthrough
  • By transforming the ad-hoc defects into executable test cases
  • At code level or unit test level, test coverage can be achieved by availing the automated code coverage or unit test coverage tools
  • Functional test coverage can be done with the help of proper test management tools

Benefits of Test Coverage

  • It can assure the quality of test
  • It can help identify what portions of the code were actually touched for the release or fix
  • It can help to determine the paths in your application that were not tested
  • Prevent defect leakage
  • Time, scope and cost can be kept under control
  • Defect prevention at an early stage of project life cycle
  • It can determine all the decision points and paths used in the application, which allows you to increase test coverage
  • Gaps in requirements, test cases and defects at unit level and code level can be found in an easy way

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