Validate Unit-Test Coverage and Identify Missing Scenarios
Company: Capital One
Role: Data Scientist
Category: Coding & Algorithms
Difficulty: Medium
Interview Round: Onsite
##### Scenario
Tech round: reviewing an existing unit-test that exercises the class from Part 2
##### Question
i) What does the current unit-test validate?
ii) List additional scenarios you would test and justify each.
iii) Choose the most critical missing scenario and write the corresponding test code.
##### Hints
Cover null inputs, mismatched dimensions, deterministic output, and exception handling; use pytest assertions.
Quick Answer: This question evaluates a data scientist's ability to assess unit-test coverage, identify missing test scenarios, and implement targeted tests that ensure correctness, robustness, and proper error handling; it is categorized under Coding & Algorithms and tests competencies in software testing, test design, and code reliability.
