Testcase can be a set of user actions with expected results.
Module can be divided in to set of testcases.
Each testcase explains some part of functionality.
It could be either functional testing or secuirty testing or GUI testing or load testing.
Testcase includes nagative testing too. means what module should not do.
Testplan defines the complete process of testing life cycle of projected module.
Testplan explains core functionality of module , functional areas , resources , estimated hours , risk management , deliverable etc.
testcases can be build up only after functional document get signed off from management team. Developers get the both functional and technical docs.
But QA team requires only functional doc.
Go through functional doc and analyze functional areas , define test cases,
then explain each test case step by step with expected result.
For example:
Let\'s assime that your module is Yahoo.com
You Write testcase as follows
1)
Useraction : Open Yahoo module in browser by using following url.
http://www.yahoo.com
Expected Result:Yahoo home page should be displayed.
2)Click on Mail link on home page
Ex.Result : User Name and password fields should be displayed.
Cursor should be focused to \'Username\' field.
3)You can do negetive testing.i.e. enter user name only and click on Submit.
It should display on error message.