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Incremental Testing in Software Testing

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  • Last Updated : 19 Sep, 2022
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Incremental Testing :
Like development testing is also a phase of SDLC (Software Development Life Cycle). Different tests are performed at different stages of the development cycle. Like that, Incremental testing is one of the testing approach which is commonly used in software field during the testing phase of integration testing which is performed after unit testing. Several stubs and drivers are used to test the modules one after one which helps in discovering errors and defects in the specific modules. 

Let’s understand it in more simpler way, after the completion of unit testing, integration testing is performed accordingly which is the simple process of detecting the interface and interaction between different modules. So, while the ongoing process of integration takes place there is a lot of methods and technology used one of that is incremental testing. It’s a kind of approach where developers sums up the modules one after one using stubs or drivers to unfold the defects.

Within incremental testing a range of possibilities exists and several Methodologies
Lets have a look on them:  

  1. Top-down incremental integration –
    In this the modules are tested top to bottom according the architectural design meanwhile follows control flow. Unavailable Component or systems are easily replaced by stubs.
  2. Bottom-Up integration –
    This type of integration testing occurs from bottom to top. Control flow also takes place in upward direction. Unavailable components or system are easily substituted  by drivers.
  3. Functional incremental Integration –
    In this both integration and testing takes place and are completed on the basis of functionalities or specified functional documents.

These several methodologies for incremental Testing which includes some steps followed are discussed below 

  • All the used modules are individually tested using the unit tests .
  • Each module combines and gets tested by incrementing by one.
  • The recent module is added to previously integrated modules and then goes through the test process.
  • Then the last module gets incremented and all the modules are tested together for a successful integration.

Feature of continual Testing :

  • Each module gives specific role which is played in structuring the project.
  • Every module has clear defined dependencies which are used while Runtime.
  • The biggest advantage of incremental testing is detecting root cause of defects which are found in early stage within smaller assembly.

Advantages of Incremental Testing :

  • Each modules has it own specific significant. Each one gets a role to play during the  testing as they are incremented individually.
  • Defects are detected in smaller modules rather than denoting errors then editing and re correcting large files.
  • Its more flexible and cost efficient as per requirements and scopes.
  • Customer gets the chance to respond to each buildings.

Drawback faced :
Since Stubs and drivers are developed and also need constant updates before used in the test, this process consume a lit bit extra time.

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