3. Describe the Concepts of Test-Driven Development 200-901 Practice Questions (Page 7)

Questions 31–35

1. 31expert · medium

   A developer is testing a function that sends a configuration to multiple devices. The function iterates over a list of device objects and calls a send_config method on each. To verify that the function sends the correct configuration to each device, what should the test do?

   • AStub the send_config method to return a fixed value and check the return value
   • BSkip the test because the function is straightforward
   • CUse a mock for each device and assert that send_config was called with the expected arguments
   • DUse a real device and check the running configuration
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2. 32application · easy

   A developer is using TDD to build a function that checks if a given IP address is within a CIDR block. They write a test that expects is_in_cidr('192.168.1.5', '192.168.1.0/24') to return True. The test fails because the function is not implemented. What should the developer do next?

   • AWrite additional tests for edge cases like network and broadcast addresses
   • BRefactor the test to use a more realistic IP address
   • CMock the IP address parsing library to avoid complexity
   • DImplement the function with the simplest logic that makes the test pass
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4. 33application · medium

   A team wants to ensure that TDD is followed in their CI/CD pipeline. They want to prevent code without tests from being merged. Which CI configuration best achieves this?

   • ARun tests only on the main branch after merging
   • BRun a coverage tool and fail the build if coverage drops below a configured threshold
   • CRequire a manual approval from a senior developer before merging
   • DRun a linter that checks for test file naming conventions
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5. 34foundation · easy

   What is the purpose of using a mock object in unit testing?

   • ATo increase the execution speed of the production code
   • BTo generate documentation for the code
   • CTo replace a real dependency with a controlled substitute
   • DTo store test data in a database
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6. 35foundation · easy

   How does test-driven development primarily contribute to reducing defects in software?

   • ABy using automated tools to find security vulnerabilities
   • BBy writing tests after the code is complete to catch bugs
   • CBy requiring a second developer to review all code changes
   • DBy ensuring that every line of code is written to satisfy a test
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