Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.
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Practice Test
161. In Node.js testing, what is a mock object used for?
A. To create HTML templates
B. To simulate the behavior of a real object for testing purposes
C. To manage hardware devices
D. To replace the actual application code
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Answer: To simulate the behavior of a real object for testing purposes
162. What is the purpose of end-to-end (E2E) testing in Node.js?
A. To test individual functions or components in isolation
B. To ensure that the entire application functions correctly as a whole, including interactions between components
C. To test database migrations
D. To handle HTTP requests
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Answer: To ensure that the entire application functions correctly as a whole, including interactions between components
163. Which Node.js testing library is commonly used for E2E testing of web applications?
A. Jest
B. Puppeteer
C. Chai
D. Axios
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Answer: Puppeteer
164. What is a "fixture" in Node.js testing?
A. A fixture is an external testing tool for load testing.
B. A special keyword used in test case descriptions.
C. A function or data setup that provides a known initial state for testing.
D. A type of testing assertion.
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Answer: A function or data setup that provides a known initial state for testing.
165. In Node.js testing, what is a code coverage report used for?
A. To generate HTML templates
B. To track which lines of code were executed during testing and identify untested code paths
C. To simulate HTTP requests
D. To manage database connections
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Answer: To track which lines of code were executed during testing and identify untested code paths
166. What is the primary goal of debugging in Node.js development?
A. To create HTML templates
B. To identify and fix defects or issues in the code
C. To optimize database migrations
D. To manage hardware devices
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Answer: To identify and fix defects or issues in the code
167. Which built-in debugging tool is available in Node.js for inspecting code execution and troubleshooting?
A. Chrome Developer Tools
B. Visual Studio Code
C. Node Inspector
D. Jasmine
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Answer: Node Inspector
168. In Node.js, what command is commonly used to launch a script in debug mode from the command line?
A. npm start
B. node inspect
C. node run
D. npm debug
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Answer: node inspect
169. What is the purpose of breakpoints in a Node.js debugger?
A. To create HTML templates
B. To pause code execution at a specific line or statement for inspection
C. To optimize network connections
D. To handle database migrations
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Answer: To pause code execution at a specific line or statement for inspection
170. Which command is used to continue code execution after reaching a breakpoint in a Node.js debugger?
A. step
B. continue
C. break
D. pause
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Answer: continue
