The testing levels are:
1)Unit Testing
2)Integration Testing
3)System Testing
4)User Acceptance Testing

1)Unit Testing: To test a single program,module,or unit of 
code.
2)Integration Testing: To test related programs,modules or 
units of code are interfaced properly or not validates that 
multiple parts of the system interact according to the 
system design.
3)System Testing: To test an entire computer system with 
respect to functionality and performance.
4)UAT: To test of a computer system or parts of a computer 
systems to make sure it will work in the system regardless 
of what the system requirements indicate.

There are two levels of testing:
1. Static Testing
2. Dynamic Testing
1. Static Testing: Static testing typically reviews and
meetings to evaluate the documents, plans, code,
requirements and specification. 
2. Dynamic Testing: 
a)Unit Testing
b)Integration Testing
c)System Testing
d)User Acceptance Testing

a)Unit Testing: To test a single program,module,or unit of 
code.
b)Integration Testing: To test related programs,modules or 
units of code are interfaced properly or not validates that 
multiple parts of the system interact according to the 
system design.
c)System Testing: To test an entire computer system with 
respect to functionality and performance.
d)User Acceptance Testing: The end user tests the
application to check whether the it is as per customers
requirements or not.

Levels of Testing :

1. Unit Testing.

2. Module Testing.

3. Integration Testing.

4. System Testing.

5. User Acceptance Testing.

1. Static testing 

2. Dynamic testing

Total Testing are 3 types only.
those are
1)Whitebox testing
2)Blockboxtesting
3)Greyboxtesting
1)Whitebox testing:
application with consideration of code.it describes about 
internal architecture of the s/w.this type of testing 
conducted by developers
2)Blockboxtesting:
app without consideration of code.it describes about 
external functionality of s/w.
this conducted by test eng..
3)Greyboxtesting:
the combination of whitebox and blockbox testing is called 
grey boxtesting.its conducted by coding and testing knows 
people.