Tutorials Hut

  • Testing Foundation

      Basics of Software Testing
       What is Software Testing?
       Objective of Testing
       Why is testing necessary?
       Common Terms used in Testing
       Verification Vs Validations
       QA Vs QC
       Debugging Vs Testing
       Seven Testing Principles
       SDLC Vs STLC
       Fundamentals of Test Process
       Software quality Factors
       Software Development Models
       Waterfall Model
       V models
       Iterative Model
       Test Levels
       Component Testing
       Integration Testing
       System Testing
       Acceptance Testing
       Strategies for Integration Testing
       Big Bang
       Stubs and Driver
       Top Down Testing
       Bottom Up Testing
       Test Types
       Functional Testing
       Non- Functional Testing
       Structural Testing
       Re-testing & Regression Testing
       Static AND Dynamic Techniques
       Static Technique
       Dynamic Technique
       Static Analysis by Tools
       White Box Techniques
       Statement Coverage Testing
       Branch Coverage Testing
       Decision Coverage Testing
       Path Coverage
       Black Box Techniques
       Equivalence Partitioning
       Boundary Value Analysis
       Decision Table testing
       State Transition testing
       Experience Based TestingTechniques
       Random Testing
       Exploratory Testing
       Error Guessing
       Functional Testing
       Integration Testing
       Unit Testing
       System Testing
       Smoke testing
       Sanity testing
       Regression Testing
       Usability Testing
       Security Testing
       User Acceptance Testing
       White Box & Black Box Testing
       Globalization & Localization Testing
       Non Functional Testing
       Compatibility testing
       Endurance testing
       Load testing
       Performance testing
       Recovery testing
       Scalability testing
       Stress testing
       Volume testing
       Test Planning and Estimation
       Test Planning
       Test Strategies Vs Test Plan
       Test Approaches
       Risk and Testing
       Product Risks
       Project Risks
       Defect Management
       Defect LifeCycle
       Severity Vs Priority

  • Integration testing: Definition, Importance, strategies/approaches

    This article will present you with a complete idea about integration testing definition, strategies , importance etc.

    We will learn below topics in this article

    What is Integration Testing?

    It is a type of testing to check if different modules work together as a whole.The purpose  is to find faults in the interaction between integrated units.
      • Main traditional strategies can be classified as top-down integration, bottom-up integration, big-bang integration.
      • We reconsider these strategies in an object-oriented environment.
      • Various factors like cost, complexity of the application etc determine which approach is selected.
    Strategies Of Integration Testing

    The purpose is to expose faults in the interaction between integrated units. Once all the modules have been unit tested, integration testing is performed.

    It is second level of testing performed after Unit Testing and before System Testing.Interaction between integrated components is called Component Integration testing.

    For more on definition refer link.


      • Helps to build real-time use cases during the end to end testing.
      • Improves test gaps and helps in better test coverage.
      • Tests are reliable and it is easy to isolate failures.
      • Integration tests detects issues such as database connection issue, connecting queues down etc.


      • Attain confidence that integrated modules work properly.
      • The tester can start testing once the modules to be tested are available.
      • Detects errors related to the interface between modules by helping modules interact with API’s and other third-party tools.

    Process :

      • Prepare Integration Test Plan.
      • Prepare integration test scenarios and test cases.
      • Create test automation scripts.
      • Execute test cases.
      • Report the defects.
      • Track and retest the defects once fixed by developers.

    Strategies for integration:

      • Top Down integration testing
      • Bottom Up integration testing
      • Big Bang integration testing

    Big Bang Testing

      • Big Bang testing is a type of testing where all the components are integrated together at once and then tested as a whole.
      • Individual modules are not integrated until and unless all the modules are ready.
      • All the modules are integrated without performing any integration testing and then it’s executed to know whether all the integrated modules are working fine or not.

    Top Down Testing

      • First Test the top layer or the controlling subsystem or Start with the ‘‘root’’ and one or more called modules.
      • Then combine all the subsystems that are called by the tested subsystems and test the resulting collection of subsystems
      • Do this until all subsystems are incorporated into the test
      • Stubs are needed to do the testing.
    Top down integration testing

    Bottom Up Testing

      • The subsystems in the lowest layer of the call hierarchy are tested individually.
      • Then the next subsystems are tested that call the previously tested subsystems
      • This is repeated until all subsystems are included
      • Drivers are needed.
    Bottom Up integration testing

    Sandwich/Hybrid Testing

    This is an approach which is a combination of Top Down and Bottom Up approaches.

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