Test Coverage (Software Testing)

Software TestingAutomation TestingTesting Tools

What exactly is test coverage?

Test coverage is a statistic in software testing that reflects how much testing a collection of tests has performed. It will include determining which portions of a program are executed during the test suite in order to determine if conditional statement branches have been taken.

It's a means of ensuring that your tests are testing your code or determining how much of your code was exercised throughout the test.

Code Coverage and Test Coverage

Coverage of code and coverage of tests are commonly confused. Even though the fundamental notions are the same, they are not identical.

Unit testing processes that must target all areas of the code at least once and are executed by developers are referred to as code coverage.

Test coverage, on the other hand, comprises at least once testing of each requirement and is obviously the duty of the QA team.

Each team's opinion determines what genuinely counts as a covered necessity.

A requirement is considered covered by certain teams if it has at least one test case against it. If at least one team member is assigned to it, it is occasionally covered. Alternatively, if all of the test cases related to it have been completed.

If there are 10 requirements and 100 tests are produced, we call this acceptable testing coverage at the design level if the 100 tests cover all ten criteria.

When just 80 of the planned tests are run and only 6 of the criteria are met. We allege that four requirements have not been reached despite the fact that 80 percent of the testing has been completed. This is execution-level coverage information.

We state the test assignment coverage is 80 percent when only 90 tests linked to 8 requirements have testers assigned to them and the rest do not. (eight out of ten) prerequisites

Knowing when to compute coverage is also crucial.

You will see a lot of gaps if you do this too early in the process since components are still lacking. As a result, waiting until the Last Build, also known as the Final Regression Build, is usually suggested. This guarantees that the Tests performed for the provided Requirements are covered appropriately.

What is the purpose of Test Coverage?

  • Identifying the region of a requirement that is not covered by a collection of test cases

  • It aids in the creation of new test cases in order to enhance coverage.

  • Developing a quantifiable metric of test coverage as an indirect technique of quality control

  • Identifying useless test scenarios that do not contribute to increased coverage.

How is Test Coverage Achievable?

  • Finding the parts of a requirement that aren't covered by a set of test cases

  • It assists in the design of additional test cases to increase coverage.

  • Developing a measurable test coverage measure as an indirect quality control approach

  • Identifying test cases that aren't useful and don't add to increased coverage

The Advantages of Test Coverage

  • It can assure that the test is of high quality.

  • It can help you figure out if sections of the code were changed for release or repair.

  • It can help you find untested routes in your application.

  • Prevent faults from spreading.

  • Time, scope, and cost are all things that can be controlled.

  • Defects should be avoided as early as possible in the project's life cycle.

  • It can figure out all of the application's decision points and paths, allowing you to improve test coverage.

  • At the unit and code levels, gaps in requirements, test cases, and issues may be quickly recognized.

What is the best way to implement a solid Test Coverage technique?

Everything depends around being aware of one's surroundings −

  • First and foremost, the QA team must comprehend the project's scope and the current state of design efforts. If further tests are implemented in this manner, they will be alerted. As is typical practice, you could achieve this using an RTM.

  • Second, investigate resource assignment and test execution techniques to guarantee that everything is tested as soon as possible.

How can you know that everything has been thoroughly tested?

  • Each tester should be familiar with both the requirements and the testing methodology.

  • Prioritize your requirements and focus your efforts where they are most needed.

  • Be aware of how a new release differs from previous ones so you may more accurately identify critical requirements and maximize favorable coverage.

  • Test Automation should be changed.

  • Make sure you're always up to date by using test management software.

  • Assigning intelligent work- Focus your best employees on critical tasks while allowing new testers to discover more from a fresh perspective.

  • Keeping track of all work and other activities with a checklist

  • To have a better grasp of the application's behavior, interact more with your Dev/Scrum/BA teams.

  • Keep track of all of your build cycles and fixes.

  • Be aware of how a new release differs from previous ones so you may more accurately identify critical requirements and maximize favorable coverage.

Important areas and strategies for efficient testing

  • Resource jumbling − Assign responsibilities to your team members. This increases engagement while avoiding information overload.

  • Compatibility coverage − When testing your application, make sure you're aware of and include all of the different browsers and operating systems.

  • Accountability − Hold testers accountable and offer them entire control over the module/task they're working on (with monitoring and guidance, of course). This encourages accountability and allows them to try new tactics rather than clinging to tried-and-true methods.

  • Deadlines − Knowing the release deadlines before starting the testing process might help with inefficient planning.

  • Keep in touch with the development and other teams in between release cycles to keep informed about what's going on.

  • Keep an RTM − This serves as a useful derivative for stakeholders and clients, allowing the release schedule to be confirmed.

Formula for Calculating Test Coverage

Follow the steps mentioned below to assess test coverage −

  • Step 1 − Determine the total amount of lines of code in the application you're evaluating.

  • Step 2 − The total number of lines of code that are currently being executed by all test cases.

(X divided by Y) must now be multiplied by 100. The result of this calculation is your test coverage %.

Consider the following scenario:

If a system component has 500 lines of code and 50 lines are executed across all current test cases, your test coverage is −

(50 / 500) *100=10%

Product coverage – What aspects of the product did you look at?

Yes, while assessing testing coverage in terms of a product, the essential question to consider is: which parts of the product have been tested and which have not?

Example 1 − Don't worry about whether or not the "knife" cuts the vegetables/fruits properly when you're testing it. The user's ability to handle it comfortably is another element to consider.

Example 2 − If you're assessing a program called "notepad," you'll need to look at pertinent aspects. Other factors to consider are whether the application responds properly while using other applications, whether the application crashes when the user tries to do something unusual, whether the user receives appropriate warning/error messages, whether the user can easily understand and use the application, and whether help content is available when needed.

If you don't look into the aforementioned cases, you can't assert that the application's testing coverage is extensive.

Risk coverage - Have you examined for any risks?

Risk coverage is another aspect of having extensive testing coverage. You can't call a product or application "tested" until you've also tested the threats that come with it. Related hazard coverage is an important part of overall testing coverage.

Example 1 − What would your reaction be if a tester informed you that he or she had thoroughly checked the airplane's internal systems and found them to be in good working order, but that only the airplane's flying capabilities had not been addressed during testing?

After all, it is what risk coverage implies. Identifying and thoroughly testing hazards unique to the application/product is always a good idea.

Example 2  − While testing an e-commerce site, the tester forgot to account for the possibility of a large number of customers accessing the site at the same time, which proved to be a big oversight on Super OFFER Day.

Requirements are covered – What specifications have you put to the test?

It's pointless to have a well-developed product or application if it doesn't suit the demands of the client. During testing, product coverage is equally as important as requirement coverage.

Example 1 − Because you were looking forward to the family reunion, you asked the tailor to make your dress and add those peacock blue display buttons to the neckline.

The tailor thought that placing those buttons on the neckline would be unpleasant when stitching the garment, so he embroidered a golden border instead. On the trial day, the disgruntled customer undoubtedly screamed at the tailor for failing to follow the instructions.

Example 2 − The tester took care of all the important points while testing a chat application, such as multiple users chatting in a group, two users chatting independently, all types of emoticons available, updates sent to the user immediately, and so on, but he or she forgot to look at the requirement document, which stated clearly that when two users chat independently, the video call option should be enabled.

The client touted the chat tool as allowing two persons to communicate individually while calling each other. You can imagine what would have happened if this had happened to the chat program.


Cons −  As a result, assessing requirements and developing test cases takes a substantial amount of time.

You may count features and compare them to a large number of tests using test coverage. However, there is always the possibility of making a mistake in judgment.

Updated on 29-Oct-2021 14:02:05