A call pair refers to a client and server that have a call
between them.

due to lack of domain knowledge a junior tester is paird up 
with a senior tester called pair testing.there is no length 
for testcase

wot is the correct answer

give one correct answer if pssble with an example.

thank u.

A call-pair is the connection between two functions in which
one function "calls" the other function. Testing the
functions where one function calls or refers the another
function is termed as Call-pair Testing.

For example, you have to book a ticket in the Railway
reservation page. When "Book Ticket" button is clicked it
will call the another function "Unallocated Seats" to check
for the availability status. Here the function Book Ticket
is the main functionality which is tested, but while testing
this function it will call the another function "Unallocated
seats" for checking the availability status. Testing this
type of function will come under Call Pair Testing. So, in
this case both the functions are validated.

Call pair testing is mostly used in the Integration Testing,
where after unit testing, you will integrate the unit tested
components and test whether as a system it performs as per
the specifications.