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How can you assert that a function foo() raises a ValueError using PyTest's assert mechanism?

hard🚀 Application Q9 of 15
PyTest - Writing Assertions
How can you assert that a function foo() raises a ValueError using PyTest's assert mechanism?
Aassert foo() throws ValueError
Bassert foo() == ValueError
Cassert foo() raises ValueError
DUse <code>with pytest.raises(ValueError): foo()</code>
Step-by-Step Solution
Solution:

  1. Step 1: Recall PyTest exception assertion

    PyTest uses with pytest.raises(ExceptionType): to check exceptions.

  2. Step 2: Evaluate options

    Only Use with pytest.raises(ValueError): foo() uses correct syntax; others are invalid Python.

  3. Final Answer:

    Use with pytest.raises(ValueError): foo() -> Option D

  4. Quick Check:

    Use pytest.raises() context for exceptions [OK]
Quick Trick: Use 'with pytest.raises()' to assert exceptions [OK]
Common Mistakes:
MISTAKES
  • Trying to assert exception like a value
  • Using invalid syntax like 'raises' or 'throws'
  • Not using pytest.raises context manager

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