5. Construct a Python Unit Test 200-901 Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A developer is writing a unit test for a function that processes a list of device configurations. The function is expected to return a dictionary keyed by device name. The test must verify that the function returns the correct dictionary for a given input. The developer also wants to ensure that the test is isolated from any external dependencies. Which approach is best?

   • AUse assertEqual to compare the returned dictionary to the expected dictionary, and mock any external calls the function makes.
   • BUse assertIn to check that a specific device name is in the returned dictionary.
   • CUse assertIsNotNone to check that the function returns a value.
   • DUse assertTrue to check that the returned value is a dictionary.
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2. 7application · medium

   A network automation script includes a function that parses a device's 'show version' output and returns a dictionary containing the 'hostname' and 'version' keys. A developer is writing a unit test to verify that the returned dictionary contains the expected keys. Which assertion should be used?

   • AassertEqual(parsed_output, {'hostname': 'R1', 'version': '17.3'})
   • BassertTrue('hostname' in parsed_output)
   • CassertIsNotNone(parsed_output.get('hostname'))
   • DassertIn('hostname', parsed_output) and assertIn('version', parsed_output)
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4. 8application · medium

   After running a unit test suite, a developer sees a coverage report showing 85% line coverage. The developer wants to identify which specific lines of code were not executed during the tests. Which tool or command should the developer use to get this information?

   • AUse unittest's built-in --verbose flag to see which tests ran.
   • BRun the tests with the coverage.py tool and generate an HTML report that highlights missed lines.
   • CUse the unittest.mock.patch decorator to track which functions are called.
   • DAdd print statements to the code to see which lines execute.
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5. 9foundation · easy

   In a unittest.TestCase class, what is the purpose of the setUp method?

   • ATo run once before all test methods in the class.
   • BTo define the test methods that will be executed.
   • CTo clean up resources after each test method.
   • DTo initialize the test environment and prepare resources before each test method runs.
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6. 10expert · hard

   A developer is writing a unit test for a function that sends a configuration to a device via an API. The function first checks if the device is reachable, then sends the configuration. The test should verify that the function does NOT send the configuration when the device is unreachable. Which approach should be used?

   • APatch the reachability check to return False, then assert that the API call method was NOT called.
   • BPatch the API call method to raise an exception, then assert that the exception is raised.
   • CUse assertRaises to check that the function raises an exception when the device is unreachable.
   • DUse assertTrue to check that the function returns True when the device is unreachable.
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