You are working on a project with tight deadlines, and there is limited time for testing. How would you prioritize testing activities to ensure the quality of the application without compromising the timeline?
- ) Prioritize Functional Testing and skip Performance Testing
- b) Reduce test coverage and focus on critical paths
- c) Extend the project timeline to accommodate comprehensive testing
- d) Skip testing and rely on post-release bug fixes
When facing tight deadlines, it's advisable to reduce test coverage and focus on critical paths (Option b). Skipping testing (Option d) is not a recommended practice as it can lead to significant post-release issues. Extending the timeline (Option c) may not be feasible, and prioritizing Functional Testing while skipping Performance Testing (Option a) can leave performance issues unaddressed.
What is the primary purpose of setting up test suites in a testing framework?
- Test suites organize individual test cases into logical groups.
- Test suites improve the performance of test execution.
- Test suites make it easier to write complex test cases.
- Test suites ensure that tests are executed in random order.
Test suites in a testing framework are used to organize individual test cases into logical groups, making it easier to manage and execute tests. This helps maintain a structured and organized testing process.
You are tasked with optimizing a Node.js application suffering from frequent delays and unresponsive behavior. How would you diagnose and address potential issues related to the Event Loop and blocking operations?
- Increase the size of the Event Loop thread pool.
- Use profiling tools like Node.js built-in profiler or third-party tools like Clinic.js.
- Replace Node.js with a different runtime environment.
- Use synchronous file I/O operations for better performance.
To diagnose and address issues related to the Event Loop and blocking operations in Node.js, you should use profiling tools like Node.js built-in profiler or third-party tools like Clinic.js. These tools help you identify bottlenecks and performance issues in your code. Options a, c, and d are not recommended solutions and may lead to further issues.
In the context of testing, what is the main difference between a mock and a stub?
- Stubs are used for functions, while mocks are used for objects
- Mocks record and verify interactions, while stubs only simulate behavior
- Stubs are only used in integration tests, while mocks are used in unit tests
- Mocks are less flexible than stubs
The primary difference between a mock and a stub is that mocks record and verify interactions between the code under test and the dependencies, whereas stubs only simulate the behavior of dependencies. Mocks are used to ensure that specific interactions occur as expected, while stubs focus on controlling the response of functions or methods.
In Express.js, how can middleware be utilized to implement authorization checks for different routes?
- Middleware can't be used for authorization checks in Express.js.
- Middleware functions can be added to route definitions to execute specific authorization logic before handling a request.
- Middleware can only be used for logging purposes in Express.js.
- Authorization checks can only be done in the route handler functions.
Middleware in Express.js is versatile and can be used for various purposes, including implementing authorization checks. By adding middleware functions to specific route definitions, you can ensure that certain authorization logic is executed before the route handler processes the request.
Utilizing closures with caution is essential as they can lead to potential memory leaks due to retained ________.
- Variables
- Functions
- References
- Objects
Closures retain references to their containing scope, which includes variables and functions. If not managed carefully, this can lead to memory leaks as these references may prevent objects from being garbage collected.
How can the process object be used to handle application termination in Node.js?
- process.exit()
- process.end()
- process.terminate()
- process.halt()
In Node.js, you can use process.exit() to gracefully terminate a Node.js application. It allows you to specify an exit code. The other options, such as process.end(), process.terminate(), and process.halt(), are not valid methods for application termination.
Which of the following is a primary use case for stubbing in tests?
- Capturing and verifying function calls
- Simulating the behavior of a function or method
- Mocking external dependencies
- Generating random test data
Stubbing in tests is often used to simulate the behavior of a function or method, allowing you to control its responses for testing purposes. It's especially useful when you want to isolate the code under test and ensure that certain functions return specific values or execute specific code paths.
How can you ensure the security of file uploads in a web application?
- Use an unauthenticated endpoint
- Limit file size
- Disallow specific file types
- Perform server-side validation
To ensure the security of file uploads in a web application, it's crucial to perform server-side validation. This includes checking the file's content type, verifying its size, and possibly scanning it for malware. Other important security measures include limiting file sizes to prevent denial-of-service attacks and disallowing specific file types to prevent the upload of potentially harmful files. Using an unauthenticated endpoint is not recommended as it could lead to security vulnerabilities.
In JavaScript, altering an object’s prototype at runtime can lead to ______ performance impacts.
- Positive
- Negative
- No
- Minimal
In JavaScript, altering an object's prototype at runtime can lead to "Negative" performance impacts. Modifying prototypes at runtime can cause performance bottlenecks, as it can affect the behavior of all objects that share the same prototype. It's generally recommended to avoid such runtime modifications for performance reasons.