How Would You Test a System That Counts the Leaves on a Tree?

Quick Overview

This question evaluates a candidate's ability to design a test strategy for an ambiguous, open-ended system rather than write code. It tests skills in scoping requirements, identifying an oracle problem for hard-to-verify outputs, and structuring functional, boundary, negative, and non-functional test categories. It is commonly used in software engineering fundamentals interviews to assess conceptual reasoning about quality assurance and testability.

How Would You Test a System That Counts the Leaves on a Tree?

Company: Glean

Role: Software Engineer

Category: Software Engineering Fundamentals

Difficulty: medium

Interview Round: Technical Screen

Overview: This question evaluates a candidate's ability to design a test strategy for an ambiguous, open-ended system rather than write code. It tests skills in scoping requirements, identifying an oracle problem for hard-to-verify outputs, and structuring functional, boundary, negative, and non-functional test categories. It is commonly used in software engineering fundamentals interviews to assess conceptual reasoning about quality assurance and testability.

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Glean
Jun 19, 2026
mediumSoftware EngineerTechnical ScreenSoftware Engineering Fundamentals
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