Testing Fundamentals - Testing Types and Levels
You want to write a unit test for a function that returns the maximum number from a list. Which test case below best checks the function handles an empty list correctly?
You want to write a unit test for a function that returns the maximum number from a list. Which test case below best checks the function handles an empty list correctly?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the edge case
An empty list has no maximum value, so the function should handle this gracefully, often by returning None or raising an error.Step 2: Evaluate test cases
assert max_number([]) == None tests the empty list case expecting None, which is appropriate. Other options test normal lists, not empty.Final Answer:
assert max_number([]) == None -> Option DQuick Check:
Empty list test expects None [OK]
Quick Trick: Test empty inputs with None or error expected [OK]
Common Mistakes:
- Not testing empty list edge case
- Using normal list tests for empty case
- Assuming empty list returns zero
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