Question

Write 3 test cases to test the operation of a stack. The test cases should be black box test cases.
The input and output functionality that you can test for a stack are creating an empty stack with a certain capacity, "push" an item
on the stack, "pop" an item off of the stack, and examine the item on the top of the stack ("top").
At least 1 of your test cases needs to test a boundrary condition and at least 1 of your test cases
needs to test a nominal conditional. Your test cases should be written in verbal form.

An example of a test case for a List class is the following:
Create an empty list. Then add 3 integer elements to the list where position 0 is a 11, position 1 is
a 21, and position 2 is a 31. Now erase position 0 of the list. Test to see that position 0 has a 21
and position 1 has a 31.

Answer 1

# There can be various cases which can be tested on a stack:

1. Check empty stack: 
When the stack gets initialized, its size should be equals to 0.

2. Create stack and push some elements:
Create a new Stack. Push 3 integers, 10, 20 and 30.. Now Check the size of stack should be 3.

3. Check the order of elements being removed:
Create a new Stack. Push 3 integers, 10, 20 and 30.. Now remove the elements one by one until the stack becomes empty. The removed elements should be in order 30, 20 & 10.

4. check top method:
Create a new Stack. Push 2 integers, 10, 20. The top method should return 20. The push 30.
Now top method should return 30. Pop a element. The top method should now return 20 again.

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