What are the Integration Testing Approachs? or What is Hybrid Testing and what are the related terms of Hybrid Testing Approaches?

There are 3 types of Integration Testing Approaches:
1. Top Down Testing Approach
2. Bottom Up Testing Approach
3. Hybrid/SandWitch Testing Approach.

What is Top Down Testing Approach?
Ans: In the Top down Testing, Testing can be done or conducted on the main module without coming to the sub-Modules.

What is Bottom Up Testing Approach?
Ans: In the Bottom Up Testing, Testing can be done or conducted on the Sub-module without coming to the sub-Modules.

Hybrid Testing: It is a combination of Top down Testing and Bottom up Testing. This testing is also called as SandWitch Testing.

or,

A combination of Top down testing combined with bottom up testing of prioritized or available components.