You want to create a pytest fixture that opens a file before a test and closes it after. Which fixture code correctly uses yield for this purpose?

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PyTest - Fixtures

You want to create a pytest fixture that opens a file before a test and closes it after. Which fixture code correctly uses yield for this purpose?

Adef file_fixture(): yield open('data.txt') f.close()

Bdef file_fixture(): f = open('data.txt') yield f f.close()

Cdef file_fixture(): f = open('data.txt') f.close() yield f

Ddef file_fixture(): f = open('data.txt') yield f.close()

Step-by-Step Solution

Solution:

Step 1: Open file before yield and yield file object
def file_fixture(): f = open('data.txt') yield f f.close() opens the file, yields the file object to the test, allowing test to use it.
Step 2: Close file after yield
After test finishes, code after yield closes the file, ensuring cleanup.
Final Answer:
def file_fixture(): f = open('data.txt') yield f f.close() -> Option B
Quick Check:
Open before yield, yield resource, close after yield [OK]

Quick Trick: Yield resource to test, cleanup after yield [OK]

Common Mistakes:

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