Testing type based on the life cycle in which they are exercised.
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User Acceptance Testing
Testing Types -
Life Cycle
Acceptance Testing is the formal testing conducted to determine whether a software system satisfies its acceptance criteria and to enable buyer to determine whether to accept the system or not.Acceptance testing is designed to determine whether software is fit for use or not. Apart from functionality of application, other factors related to business environment also plays an important role.
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System Testing
Testing Types -
Life Cycle
System testing is probably the most important phase of complete testing cycle. This phase is started after the completion of other phases like Unit, Component and Integration testing. During the System Testing phase, non functional testing also comes in to picture and performance, load, stress, scalability all these types of testing are performed in this phase.
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Hybrid Integration Testing
Testing Types -
Life Cycle
Top-down and bottom-up, both the types of testing have their advantages and disadvantages. While in top-down integration testing it is very easy to follow the top-down software development process at the same time in bottom-up testing, the code is used mostly is tested repetitively.
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Bottom Up Integration Testing
Testing Types -
Life Cycle
In bottom up integration testing, module at the lowest level are developed first and other modules which go towards the 'main' program are integrated and tested one at a time. Bottom up integration also uses test drivers to drive and pass appropriate data to the lower level modules. As and when code for other module gets ready, these drivers are replaced with the actual module. In this approach, lower level modules are tested extensively thus make sure that highest used module is tested properly.
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Top Down Integration Testing
Testing Types -
Life Cycle
Top down integration testing is an incremental integration testing technique which begins by testing the top level module and and progressively adds in lower level module one by one. Lower level modules are normally simulated by stubs which mimic functionality of lower level modules. As you add lower level code, you will replace stubs with the actual components. Top Down integration can be performed and tested in breadth first or depth firs manner.
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Big Bang Integration Testing
Testing Types -
Life Cycle
In big bang Integration testing, individual modules of the programs are not integrated until every thing is ready. This approach is seen mostly in inexperienced programmers who rely on 'Run it and see' approach. In this approach, the program is integrated without any formal integration testing, and then run to ensures that all the components are working properly.
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Integration Testing
Testing Types -
Life Cycle
Objective of Integration testing is to make sure that the interaction of two or more components produces results that satisfy functional requirement. In integration testing, test cases are developed with the express purpose of exercising the interface between the components. Integration testing can also be treated as testing assumption of fellow programmer. During the coding phase, lots of assumptions are made. Assumptions can be made for how you will receive data from different components and how you have to pass data to different components.
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Unit Testing
Testing Types -
Life Cycle
I have heard some people saying that Unit testing is done primarily by the developers and test engineers need not know about Unit testing. But this is not the case, Unit testing is as important for test engineers as it is for developers.
Probably developers will write the unit test cases but your understanding of the framework and unit testing can certainly help him/her in designing the flow for unit test cases, generating test data and making good reports. All these activities will ultimately help you in the long run as product quality will increase significantly because of the efforts you put in on the unit testing. So if you think as a test engineer, you should also learn/know about unit testing read on.
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Testing Types 
