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A pytest test function that verifies the HashCleaner's behavior when processing an empty list of text chunks.

Purpose

This is a unit test that validates the edge case handling of the HashCleaner.clean() method when given an empty input list. It ensures that the cleaner returns an empty list when no text chunks are provided, confirming proper boundary condition handling and preventing potential errors with empty inputs.

Source Code

def test_empty_input(hash_cleaner):
    text_chunks = []
    expected_output = []
    cleaned_chunks = hash_cleaner.clean(text_chunks)
    assert cleaned_chunks == expected_output

Parameters

Parameter Details

hash_cleaner: A pytest fixture that provides an instance of the HashCleaner class. This fixture is expected to be defined elsewhere in the test suite and is automatically injected by pytest's dependency injection mechanism.

Return Value

This function does not explicitly return a value. As a pytest test function, it either passes silently (returns None implicitly) or raises an AssertionError if the test fails. The test passes when the cleaned_chunks equals the expected_output (both empty lists).

Dependencies

• pytest
• src.cleaners.hash_cleaner

Required Imports

import pytest
from src.cleaners.hash_cleaner import HashCleaner

Usage Example

# Assuming hash_cleaner fixture is defined in conftest.py:
# @pytest.fixture
# def hash_cleaner():
#     return HashCleaner()

import pytest
from src.cleaners.hash_cleaner import HashCleaner

def test_empty_input(hash_cleaner):
    text_chunks = []
    expected_output = []
    cleaned_chunks = hash_cleaner.clean(text_chunks)
    assert cleaned_chunks == expected_output

# Run with: pytest test_file.py::test_empty_input

Best Practices

• This test follows the Arrange-Act-Assert (AAA) pattern: setting up test data, executing the method, and verifying the result
• Testing empty input is a critical edge case that should always be included in test suites
• The hash_cleaner fixture should be properly defined in conftest.py or the test file to ensure test isolation
• Consider adding additional edge case tests such as None input, single element lists, and lists with various content types
• The test name clearly describes what is being tested, following pytest naming conventions

Tags

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