Practice Testing in CS Thinking

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

Systematically running a program with known inputs to verify that its outputs are correct. Testing involves designing test cases that cover normal inputs, boundary values, and error conditions, then comparing actual results against expected results.

Try to break it before users do. Test normal cases, edge cases, and error cases.

Example 1

easy
A function isEven(n) should return TRUE if n is even and FALSE otherwise. Suggest three test cases, including a normal, boundary, and erroneous value.

Example 2

medium
A program grades students: 90-100 = A, 80-89 = B, 70-79 = C, 60-69 = D, below 60 = F. Design a complete set of test data including boundary values.

Example 3

medium
A password validation function requires: at least 8 characters, at least one uppercase letter, and at least one digit. Design test cases that check each requirement independently.

Example 4

hard
Explain the difference between white-box and black-box testing. Which approach would you use to test a sorting function, and why?
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