What is Unit Testing?
It is a type of software testing in which a small piece of code is tested to see if the code works as expected. Unit Testing is done during the development of an application and is typically performed by the developer.
It helps to reduce the cost of bug fixes, as bugs are identified early in the development lifecycle.
What is Integration Testing?
As its name implies, an Integration Test verifies that the interface between two software units or modules works correctly. It covers the whole application.
Unit Testing VS Integration Testing
To clarify the distinction between the two, let's look at the comparison table:
|Unit Testing||Integration Testing|
|It tests small modules or a piece of code of an application||Individual units of a program are combined and tested as a group|
|It's a quick write-and-run test||It is slower to run|
|Typically performed by the developer||It is carried out by a separate team of testers|
|It can be performed at any time||It is usually carried out after Unit Testing|
|It has very low maintenance||It has very high maintenance|
|It is very limited in scope, as it only covers a piece of code||It has wider scope as it covers whole application|
|It pays attention to the behavior of single modules||It pays attention to integration among modules|
|Finding errors is easy||Finding errors is difficult|
|Tester knows the internal design of the software||Testers don't know the internal design of the software|
|It is white box testing||It is a black box testing|
- Integration Tests will help to verify the overall system while Unit Testing is a testing method by which individual units of code are tested.
- Issues found in Unit Testing can be instantly fixed but issues found in Integration Testing take a lot of time and cost to fix as it becomes difficult to find where exactly a bug has arisen.
- Unit Testing is a kind of white box testing, whereas Integration Testing is a kind of black-box testing.
- For Unit Testing, accessibility of code is required, as it tests the written code, while for Integration Testing, access to code is not required, since it tests the interactions and interfaces between modules.
- Neither of these two tests can be considered more important than the other. Both the Unit Test and Integration Test are very important and useful.
- They should be performed rigorously, on time and should always be an integral part of the development process. It is always important to remember that both tests are correlated.
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