Whenever a product is manufactured, the different components of that product are tested separately. Unit testing does the same thing. It is performed before integration testing. The main benefit of unit testing is that the cost incurred in the fixation of a defect during unit tests is less than the price incurred on higher levels. During unit testing, the bugs found can be fixed as we do not have to make changes in the entire software but only on that specific unit.
All the individual units are tested as a group during unit testing. This testing finds out the defects that would occur when two or units interact with each other. This lets the tester know how well the different components are integrated. There are two types of integration testing:
- Unit Integration Testing – tests the interactions between components
- System Integration Testing –tests the interaction between systems
It could be done in four ways.
- The top-down approach
- The bottom-up approach
- The hybrid or sandwich approach
- The big bang approach
Smoke testing makes sure that if there is a defect, you may not proceed with further tests. You want to prevent the smoke from lighting a fire. It is a build verification test that decides if the application or software is strong enough in its build for further testing. It is performed using the black-box testing method.
Different code changes are made in the software during the process of software development. Regression testing validates if any code change in the software impacted its functionality in any way. It re-executes the test cases and checks if there are any new bugs. It tests the part of the software that was not changed during the new coding.
This test checks the ability of a system to bear the load. It tests the application’s speed, browser response time, memory consumption, reliability, size, etc. When tested, these performance indicators highlight the places that you need to improve to provide your user with a smooth experience with your app. Some performance software testing services are:
- Stress testing
- Spike testing
- Volume testing
- Load testing
- Scalability testing
Security testing protects the software from malevolent attacks. It keeps the application safe from intruders. It identifies all the weaknesses and threats that might result in the leak of important information. Once every loophole is identified by security testing, it can be encountered and managed. The application can be saved from being exploited with the help of security testing.
It measures the ability of software to recover from hardware/ software or network failures. For instance, if the application cable is disconnected when it is receiving the data. After a few moments, the application is switched on again to check if it can receive data from the point where it was disconnected. This will tell us about the ability of the software to recover. If the data is not restored, then businesses might face losses. This makes this test very important. Even during the testing phase, the team must have a proper restoration strategy to bring back the data if the test fails.