What is test data used for?

What is test data used for?

• A. Usual values used to test a program.
• B. Data that must be unique.
• C. Data that is used only for error logging.
• D. Data that is used to measure performance.

Answer: (A)

Test data are inputs used to check that a program behaves correctly with typical values. By feeding normal inputs you can confirm the program computes the right outputs and follows the intended logic. This often includes a range of values that reflect real usage, and may also cover edge cases to probe robustness. The other ideas don’t fit as well: uniqueness isn’t inherent to testing, logging data is for monitoring or debugging rather than testing, and data used to measure performance belongs to benchmarking rather than verifying correctness.

Test data are inputs used to check that a program behaves correctly with typical values. By feeding normal inputs you can confirm the program computes the right outputs and follows the intended logic. This often includes a range of values that reflect real usage, and may also cover edge cases to probe robustness. The other ideas don’t fit as well: uniqueness isn’t inherent to testing, logging data is for monitoring or debugging rather than testing, and data used to measure performance belongs to benchmarking rather than verifying correctness.