Support Testing and Security GH-300 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A developer is writing a unit test for a function that returns the maximum value from an array of numbers. The function should return null for an empty array. Which assertion is the most appropriate?

   • Aexpect(findMax([])).not.toBe(0)
   • Bexpect(findMax([])).toBeFalsy()
   • Cexpect(findMax([])).toBeNull()
   • Dexpect(findMax([])).toBeUndefined()
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2. 2expert · hard

   A developer is optimizing a function that processes a large dataset. The function currently reads the entire dataset into memory, which causes high memory usage. The developer asks Copilot for suggestions. The dataset is too large to fit in memory, but the processing can be done in a single pass. What is the most appropriate optimization?

   • AProcess the dataset in a streaming fashion, reading and processing chunks at a time
   • BCompress the dataset in memory to reduce its size
   • CUse a more efficient data structure to store the dataset in memory
   • DUse a database to store the dataset and query it as needed
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4. 3foundation · easy

   A developer wants to use GitHub Copilot to create a test for a single function that calculates the total price of items in a shopping cart. Which type of test should Copilot be asked to generate?

   • AAn integration test that verifies the cart interacts correctly with the payment service
   • BA performance test that measures how quickly the function executes with a large cart
   • CAn end-to-end test that simulates a user adding items and checking out
   • DA unit test that calls the function with sample inputs and checks the returned total
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5. 4expert · hard

   A developer is optimizing a web service that returns a large JSON payload. The payload contains many fields, but most clients only need a few of them. The developer asks Copilot for performance improvements. The service is currently CPU-bound due to serialization. What is the most effective optimization?

   • ACache the serialized JSON response
   • BImplement field selection so clients can request only the fields they need
   • CEnable HTTP compression (gzip) on the response
   • DUse a faster JSON serialization library
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6. 5foundation · easy

   When using GitHub Copilot to generate unit tests for a function, what is the primary purpose of the generated test code?

   • ATo measure how long the function takes to execute
   • BTo check that the function's dependencies are properly configured
   • CTo verify that the function behaves correctly for given inputs
   • DTo ensure the function is called by other parts of the application
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