Types of Testing:

Testing assures that the end product (system) meets requirements and expectations under defined operating conditions. Within an IT environment, the end product is typically executable code.

Various types of Testing are,
White-Box
White-box testing (logic driven) assumes that the path of logic in a unit or program is known. White-box testing consists of testing paths, branch by branch, to produce predictable results.

Black-Box
In black-box testing (data or condition driven), the focus is on evaluating the function of a program or application against its currently approved specifications. Specifically, this technique determines whether combinations of inputs and operations produce expected results. As a result, the initial conditions and input data are critical for black-box test cases.

Incremental
Incremental testing is a disciplined method of testing the interfaces between unit-tested programs and between system components. It involves adding unit-tested programs to a given module or component one by one, and testing each resultant combination. The approach can be Top-Down or Bottom-Up.

Thread
This test technique, which is often used during early integration testing, demonstrates key functional capabilities by testing a string of units that accomplish a specific function in the application. Thread testing and incremental testing are usually used together. For example, units can undergo incremental testing until enough units are integrated and a single business function can be performed, threading through the integrated components.

Regression
There are always risks associated with introducing change to an application. To reduce this risk, regression testing should be conducted during all stages of testing after a functional change, reduction, improvement, or repair has been made. This technique assures that the change will not cause adverse effects on parts of the application or system that were not supposed to change.