Test-Cases for the calculator

so here we have 12 buttons total
ie 0,1,2,3,4,5,6,7,8,9,ADD,Equalto -12 buttons
here u can press atleat 4 buttons at a time minimum 
for example
   0+1=
for zero u should press 'zero' labled button
for plus u should press '+' labled button
for one  u should press 'one'  labled button
for equalto u should press 'equalto'  labled button
 0+1=
here + and = positions will not vary
so first number position can be varied from 0 to 9 i.e 
from permutation and combinations u can fill that space in 
10 ways
in the same way
second number position  can be varied from 0 to 9 i.e 
from permutation and combinations u can fill that space in 
10 ways

Total number of possibilities are =10x10=100
This is exhaustive testing methodology and this is not 
possible in all cases.
In mathematics we have one policy that the the function 
satisfies the starting and ending values of a range 
then it can  satisfy  for entire range of values from
starting to ending.

then we check the starting conditions i.e
one test case for '0+0='
(expected values you know thatis '0')
then another testcase for '9+9='
(expected values you know thatis '18')

only two testcases are enough to test the calculator 
functionality.


if you still  have any doubt feel free to mail me at :  
rajendra_penumalli@yahoo.com
or call me:9885162742(hyd)

infinite test case

we can write 3 test caes...following are the test cases
--Check for the enabled property of buttons from 
0,1,2,3,4,5,6,7,8,9 and Add , Equal to.
--Click on all thebuttons from 1 - 9 and check whether the 
respective no's are displayed or not.
--Enter the valus as per the valid input the table,click on 
ADD button and check whether the actual value is matching 
ith the expected value.

s.no    values   Actual     Expected
                  value      Value
1       0+1                  1
2       0=2                  2
          till 9

In the same way for all the values we can write  table and 
calculate the actual values.