What is Functional Testing?Examples of functional testing

What is Functional Testing??
  • Verifying the functionality of each and every component thoroughly or vigorously in an application against the requirement is called functional testing.

  • Example: Requirement given by the customer for banking application 

    1. Login     

     1.1)Username: Username should be a 5 digit account number.

     1.2)Password: Password should be a minimum of 6 and a maximum of 12 characters.

       

          2. Amount transfer :


    2.1)To a/c no: It should be 12 digits a/c number.

    2.2)Amount: It should accept a minimum of 200 and a maximum of 50,000.                      

    2.3)Bank Name: It should be a valid bank name.


Also Read :Integration Testing and its type with examples


  • Testing of the above requirement will look like this : 
  • 1.)For login Field, Customer has given a requirement that username should be of 5 digits so we will test the functionality of username field by: 

    • Entering username less than 5 digits.

    • Entering username greater than 5 digits.

    • Entering alphanumeric characters in the user name field.

    • Entering a special character in the user name field.   

    • Entering 5 digit username.

    • Leaving the username field blank and proceeding further.       

    2.)For the password field, the user has given a requirement that the password field should be minimum 6 and maximum 12 characters so we will test the functionality of the password field by:  

    • Enter a password of fewer than 6 characters.

    • Entering a password greater than 12 characters.

    • Entering the password of character size between 12 to 16.

    • Leave the password field blank and proceed.

    • Entering the password of 6 characters.

    • Enter a password of 12 characters.

      3.)In Amount transfer for the account number field, the user has given a requirement that to a/c number  should be of 12 digits so we will test the functionality of a/c number field by:

    • Entering account number less than 12 digits.

    • Entering account number greater than 12 digits.

    • Entering the account number of 12 digits.

    • Entering Alphanumeric characters.

    • Entering special characters.

    • Leaving the Account number field blank and proceeding further. 

      4.)In amount transfer for the amount field, the user has given a requirement that amount should accept minimum 200 and maximum 50,000 so we will test the functionality of amount field by: 

    • Entering amount less than 200.

    • Entering an amount greater than 50,000.

    • Entering amount in decimal.

    • Entering value which is between 200 and 50,000.

    • Leave the amount field blank and proceed further. 

      5.)In amount transfer for bank name the user has given a requirement that bank name should be valid bank name so we will test the functionality of bank name by: 

    • Entering an invalid bank name.

    • Entering a special character in the bank name field.

    • Leaving the Bank name field blank and proceed further.

    • Entering numeric values in the bank name field.


Also Read :System testing And how to perform system testing with example





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