[Solved] You want to verify that a function fetch_data() returns a list containing... Which pytest assert statement is most appropriate?def test_fetch_data(): data = fetch_data() # Choose the correct assert | PyTest

PyTest - Writing Assertions

You want to verify that a function fetch_data() returns a list containing exactly 3 elements. Which pytest assert statement is most appropriate?

def test_fetch_data():
    data = fetch_data()
    # Choose the correct assert

Aassert data.length == 3

Bassert data == 3

Cassert len(data) == 3

Dassert data.count == 3

Step-by-Step Solution

Solution:

Step 1: Understand the data type
data is a list, so use len() to get its length.
Step 2: Check correct syntax
assert len(data) == 3 correctly asserts the list length.
Step 3: Identify incorrect options
data == 3 compares list to int, data.length and data.count are invalid in Python lists.
Final Answer:
assert len(data) == 3 -> Option C
Quick Check:
Use len() to check list length [OK]

Quick Trick: Use len() to assert list length in pytest [OK]

Common Mistakes:

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You want to verify that a function fetch_data() returns a list containing exactly 3 elements. Which pytest assert statement is most appropriate?