5. Construct a Python Unit Test 200-901 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the purpose of a test method inside a unittest.TestCase class?

   • ATo define the setup and teardown logic for the test case.
   • BTo define the order in which other test methods are executed.
   • CTo contain the actual assertions that verify the behavior of the code under test.
   • DTo group multiple test cases into a single suite.
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2. 2application · medium

   A test class needs to set up a mock for a database connection before each test and verify that the mock was used correctly after each test. Which combination of methods should be used?

   • AsetUp to create the mock and tearDown to assert on the mock's call history.
   • BUse the mock in the test method and assert on it at the end of the test method.
   • CUse a global mock variable and reset it in setUp.
   • DsetUpClass to create the mock and tearDownClass to assert on the mock's call history.
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4. 3application · easy

   A developer is creating a new test file for a module named 'device_utils.py'. The test file should be automatically discovered by unittest when running 'python -m unittest discover' from the project root. Which file name should the developer use?

   • Adevice_utils_tests.py
   • Bdevice_utils_test.py
   • Ccheck_device_utils.py
   • Dtest_device_utils.py
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5. 4application · medium

   A network engineer is writing unit tests for a function that returns the status of an interface as a string. The function should return 'up' when the interface is administratively and operationally up. The engineer writes a test method inside a TestCase class and wants to verify that the function returns the exact string 'up' for a given input. Which assertion should the engineer use?

   • AassertIn('up', interface_status(input))
   • BassertEqual(interface_status(input), 'up')
   • CassertTrue(interface_status(input) == 'up')
   • DassertIs(interface_status(input), 'up')
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6. 5application · medium

   A developer is writing tests for a class that opens a network connection in its constructor and closes it in a close() method. Each test must start with a fresh connection and end by closing it, even if the test fails. Which approach correctly implements this behavior?

   • ACreate the connection at the top of each test method and close it at the bottom.
   • BUse a class-level __init__ method to create the connection and a class-level __del__ method to close it.
   • CUse setUp to create the connection and tearDown to close it.
   • DUse setUpClass to create the connection and tearDownClass to close it.
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