How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a Medium difficulty Coding & Algorithms question, commonly asked during Onsite rounds at Capital One.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Capital One during technical interviews.

Validate Unit-Test Coverage and Identify Missing Scenarios

Last updated: Mar 29, 2026

Quick Overview

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.

Capital One

Aug 4, 2025, 10:55 AM

Data Scientist

Onsite

Coding & Algorithms

27 solved

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.

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Validate Unit-Test Coverage and Identify Missing Scenarios | Capital One Interview Question