functional testing is testing the whole functioalitiy of the
system or the appllication whether it is meeting the
functional specifications

integration testing means testing the functianality of
integrated module when two individual modules are integrated
for this we use top-down approach and bottom up approach

Functional Testing:
* Study SRS 
* Identify Unit Functions 
* For each unit function 
- Take each input function 
- Identify Equivalence class 
- Form Test cases 
- Form Test cases for boundary values 
- From Test cases for Error Guessing 
* Form Unit function v/s Test cases, Cross Reference Matrix 
* Find the coverage

Integration Testing: 
* Integration is a systematic approach to build the 
complete software structure specified in the design from 
unit-tested modules. There are two ways integration 
performed. It is called Pre-test and Pro-test. 


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Functional testing is a process of testing the developed 
application i.e Functional part of the application 
developed is done by testers also called as black box 
testing.

Whereas intergration testing is done after integrating the 
related modules by the developers.