Test Methodolgies defines how to approach the 
testing .project type,system domain,risks,at which phase 
what type of testing occurs,

all these comes under Methodology

test methodology - the process in which testing activity is 
determined

example: water fall model

Testing methodologies are 
1.Test Strategy.
2.Test Planninig.
3.Test Excecitio.

tanx

Test Methodology differs from company to company and 
project to project. But all of them will follow the same 
life cycle with a little bit of variance in the micro level.

In a macro level Test Methodology includes:
Test Initiation
Test Planning
Test Design
Test Execution & Defect Management
Test Closure

A project level which defines required testing approach for 
current proj. testing only.QA will follow below approach
1.Determine project type
2.Determine project req. and app.type.
3.Indentify tactical risks.
4.Identify the scope of app. req's
5.Finalize TRM for current proj.
6.Prepare sys. test plan.
7.Prepare module testplan.

hi,
    According to me test methodologie is black box 
testing.    Why because testers follow this methodology to 
tes the application.

TESTING METHODOLOGIES ARE 

  1. water fall life cycle model
  
  2. spiral model

  3. increment model

  4. v model

In my view, a test methodology is a test approach which is 
followed by a test engineer while performing testing.

Test methodology means approach to test the application. 

mainly now days Agile/ Scrum methodology is very famous.

max company fallow this  methodology,

other is Water fall model 

Spiral model 
Big bang approach
RAD (Rapid Application Development)
V model(Also famous and effective)