5. Construct a Python Unit Test 200-901 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   After running a test suite, a coverage report shows that a module has 80% line coverage. The engineer wants to identify which specific lines of code were not executed. Which tool or command provides this information?

   • AUse the coverage erase command to clear previous data.
   • BUse the unittest discover command with the --coverage flag.
   • CRun coverage report -m after running coverage run -m unittest
   • DRun unittest with the -v flag to see verbose output.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A project has tests spread across multiple files in a directory named tests/. The engineer wants to run all tests from the project root without specifying each file individually. Which command accomplishes this?

   • Apython tests/discover.py
   • Bpython -m unittest discover -s tests
   • Cpython -m unittest -d tests
   • Dpython -m unittest tests
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which unittest assertion method would you use to verify that a specific exception is raised when a function is called with invalid input?

   • AassertRaises
   • BassertEqual
   • CassertTrue
   • DassertIn
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A network automation team has a Python module with several functions. They have written unit tests for the most critical functions, but the coverage report shows only 60% overall coverage. The team wants to increase coverage to at least 80% before the next release, but they have limited time. Which approach is most effective?

   • AWrite tests for all functions in the module, regardless of current coverage.
   • BRun coverage report to identify the functions with the lowest coverage and write tests for those functions first.
   • CUse a coverage threshold in the test runner to fail the build if coverage is below 80%.
   • DIncrease the number of test cases for the most complex functions, even if they already have high coverage.
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A developer is writing a unit test for a function that sends a command to a network device and returns the output. The function uses a shared SSH client object that is expensive to create. The test must verify that the function correctly handles a timeout exception from the SSH client. The developer wants to avoid creating a real SSH connection. Which approach is best?

   • ACreate a real SSH connection to a test device and configure it to time out.
   • BUse a fake SSH client that always raises TimeoutError.
   • CSkip the test if the network is unavailable.
   • DMock the SSH client's send_command method to raise a TimeoutError, and use assertRaises to verify the function handles it.
   Reveal Solution Discussion Select an answer first