Lab1
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Using cew to advantage, develop a test plan and test implementation for
the stack class (version 1.0).

Assumptions:

1. stack contains only integers
2. max size of stack is 10
3. only cew_Ncases are employed (no cew_Ecases)

Deliverables
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1. A print-out of your test-plan.

2. A demonstration of your cew test script.