Testing is included in  SDLC. 
•   Preparing the test strategy.
•   Preparing the test plan.
•   Creating the test environment.
•   Writing the test cases.
•   Creating test scripts.
•   Executing the test scripts.
•   Analyzing the results and reporting the bugs.
•   Doing regression testing.
•   Test exiting.

mainly the stlc contains the following stages

test initiation
test plan
test design
test execution
test reporting 
test closure

Please explain test initiation?

Completion of integretion testing is the entry criteria for 
testing 
Generally testing process starts with test 
initiation ,PM/TM catagory people involve in this phase
Testplan(a Schedule to be followed by the testing team)
prepared by Testlead
Testdesign ,testing people involve in this phase and 
prepare testscenarios and testcases
Testexecution,in this testing team execute the test cases 
with respect to expected and actual
during this any mismatches are found that will report to 
the developer ,
this is saya ,any doubts contact:9963219158
Testclosure ,testing conduct a formal meeting on the review 
of overall process

STLC(software Testing Life Cycle)
 
 1.test planing
 2.test developement
 3.test execution
 4.result analysis
 5.bug tracking or bug management

->In test planing phase test plan document will be prepared 
for project level and it will be prepared by quality 
analyst.
->In 2nd phase test cases,test scenario,test stratagy,test 
data,test script will be prepared
->In 3rd phase execute all the doc prepared in dev phase
->in 4th phase analyse the results
->In defect tracking phase 
tracker is a database s/w where we store all the defects,
reports can be generated easily by using this.

hi STLC IS:

study of doc
scope,approach.estimation
testplan design
test case design
test case review
test case execution
gap analysis
defect handling.

1. Plan 
2. Design
3. Execution
4. Automation
5. Reporting