Individual components or units of a software is tested in Unit Testing. The unit is the smallest testable part of any software.
About Unit Testing
Unit testing uses the White Box method done before Integration Testing. Software developers and their peers perform Unit testing.
Sometimes unit testing is done by individual software developers. But this rarely happens.
Benefits of Unit Testing
Codes are more reusable in Unit testing. They are modular, making them easier to reuse. These codes are also more reliable.
Unit testing means faster development. Running the test requires less time. Finding and fixing defects use less time. This is because the concentration is on smaller units, and not on the entire software. This makes work faster.
Unit testing costs less. Fixing and maintaining software using unit testing cost less. Repairing the software is faster. Maintenance is lesser. The work of testers is concentrated only on smaller parts.
When the test fails, debugging the software easy. Testers only debug the newest changes on the software.
Unit testings makes catching any defects prompt. This makes fixing it fast. Making interdependent codes can make the impact on other codes lesser.
Important Things To Remember
When writing a unit test, remember that you are writing for humans. That is why it is important that you make it simple. Computers can read your codes regardless of how complicated they may be. But humans cannot.
Unit tests are more important than codes. Losing a code means you can just recreate it from your unit test. But losing a Unit test means you need to start all over again. This will mean more work. Precious time will be wasted, and costs will be increased.
Naming your unit test is important. Choose a name which will give a brief description about the test. This will make it easier for you to identify.
Do not do multiple tests on the same thing. Multiple testing will make finding defects harder. Avoiding multiple testing will make your work faster. It will mean fixing defects fast and prompt.
More Tips On Unit Testing
Treat Unit tests as a contract. The written codes are its requirements. It is imperative that to make the codes tight, clean and easy to maintain. These will make the quality of the code higher.
Test only as much. Meaning, do not do too much testing. You might end up doing tests on the things you do not need. This may consume more time. Focus more on the ones that create an impact on the software.
It is always best to start your unit test, or any test for that matter, with a good foundation. Know what constitutes a good test file. Then find out if you have them.
Always write a test first which exposes the defect. Fixing the defect must always come after writing the test. Fixing before writing might encourage laziness on the part of the tester.
Cases which are written independent of each other is a good thing. The test cases must verify the behavior of the code. It must also ensure the code’s performance.
Unit testing can enhance the performance and quality of software. A good unit test should always have a good foundation. This will ensure that the unit test will be done properly.
Unit testing maybe taken for granted. It might be because it involves only small components of the software. This opinion should be corrected. The test may involve small components, but these are vita land important components.
In life, it is always best to never take small things for granted. They may seem insignificant at first, but might result to bigger problems if neglected.