Introduction to Unit Testing

Today we are going to discuss about Unit testing. It is one of the fundamental levels of testing in software testing. To learn unit testing and other levels of testing, you can join a software testing course in Pune. For now, let’s see the concept in brief.


Unit Testing is a level of software testing where singular units/segments of a software product are tested. The main aim is to approve that every unit of the software executes as planned.

A unit is the smallest testable piece of a software product or an application. It as a rule has one or a couple inputs and typically a solitary output. In procedural programming a unit might be an individual project, procedure, function and so on. In case of object oriented programming, the littlest unit is a method, which may have a place with a base/super class, derived/child class or abstract class. (Some treat a module of an application as a single unit. This is to be debilitated as there will most likely numerous individual units inside that module.)

Unit testing systems, stubs, drivers and fake/mock objects are utilized to help with unit testing.

Characteristics of Unit testing:

Unit testing is carried out by making use of white box testing method.

It happens to be the starting level of testing and is carried out prior to integration testing.

Unit Testing is majority of the times performed by the developers themselves or their peers. In uncommon cases it might likewise be performed by autonomous software testers.

Tasks involved in Unit testing are:

  • Planning Unit Tests
  • Writing Unit test cases
  • Executing Unit test cases

Benefits of Unit Testing:

  • The expense of resolving a defect recognized amid unit testing is lesser in contrast with that of defects identified at more higher levels of testing. Think about the cost (efforts, time devastation, mortification) of a defect recognized amid user acceptance testing or when the product is live.
  • Unit testing builds trust in changing/looking after code. In the event that great unit tests are composed and on the off chance that they are run each time any code is modified, we will have the capacity to quickly get any defects induced due to the change. Likewise, if codes are as of now made less related to make unit testing possible, the unintended effect of changes to any code is less.
  • Debugging becomes simple. At the point when a test falls flat, just the most recent changes should be debugged. With testing at more elevated levels, changes made over the range of a few days/weeks/months should be examined.
  • Codes are more reusable. So as to make unit testing conceivable, codes should be in modular format. This implies codes are simpler to reuse.
  • Codes are more reliable. Why? I think there is no compelling reason to disclose this to a normal individual.
  • Development happens in a speedier manner. How? On the off chance that you don’t have unit testing set up, you compose your code and play out that fuzzy ‘developer test’ (You set some breakpoints, fire up the GUI, give a couple inputs that ideally hit your code and trust that you are good to go.) If you have unit testing set up, you write the test, write the code and run the test. Writing test cases requires significant investment yet the time is remunerated by the less measure of time it takes to run the tests; You require not start up the GUI and give each one of those inputs. Furthermore, obviously, unit tests are more dependable than ‘developer tests’. Development is quicker over the long haul as well. How? The effort required to discover and settle defects found amid unit testing is less in contrast with the effort required to alter defects found amid system testing or user acceptance testing.

These were a few points regarding unit testing. To learn more of software testing, take admission in a software institute in Pune.

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