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240
6×40.
Class 9 · Bangla Version · ICT
Programming and practical projects
Separate requirements, unit tests and integration tests.
Original Kidemy further-topic investigation. This optional lesson is shared by related upper pathways; select suitable depth with a teacher. It does not certify complete grade or board coverage.
Learn the idea
A unit test checks a small component against an independent expected result. An integration test checks communication across components. A test double replaces an external dependency so local tests do not send real messages or charges. Different test levels answer different questions.
Worked example
A fictional booking total is n×40 for integer0≤n≤8. Unit cases include0→0,5→200 and 9→rejected. A sandbox integration test separately checks whether the booking sends the intended amount to a fake gateway.
- State expected behaviour first.
- Use independent expected answers.
- Keep tests separate from live transactions.
Your written practice
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0
No units cost zero in this model.
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rejected
The stated maximum is 8.
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Data mapping or communication between components may fail despite correct local arithmetic.
Distinguish component and integration concerns.
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Use a negative or non-integer n and expect a validation error in a local test.
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Apply the idea
Create a local test plan with boundary, invalid-input and sandbox-integration cases.
Review with a guardian or teacher
- Use the stated evidence or givens.
- Show reasoning rather than only a result.
- Review and explain one correction.
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