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Testing Sudo Command Pattern Detection in thefuck

This test suite validates the ‘unsudo’ rule functionality in thefuck project, focusing on handling commands that incorrectly use sudo when it’s not needed. The tests verify command matching and transformation behavior for removing unnecessary sudo prefixes.

Test Coverage Overview

The test coverage focuses on validating the unsudo rule’s core functionality, specifically handling root operation errors.

Tests command matching for root operation error messages
Verifies non-matching scenarios for various command patterns
Validates command transformation from sudo to non-sudo versions

Implementation Analysis

The testing approach uses pytest’s parametrize decorator to efficiently test multiple input scenarios with minimal code duplication.

Key patterns include:

Separate test cases for positive and negative matching
Parametrized input/output validation
Command object usage for consistent test data structure

Technical Details

Testing infrastructure includes:

pytest framework for test organization
Command class from thefuck.types for input structuring
Parametrize decorator for test case multiplication
Direct imports of match and get_new_command functions

Best Practices Demonstrated

The test suite exemplifies several testing best practices for Python unit tests.

Clear separation of matching and transformation tests
Comprehensive negative test cases
Efficient test case organization using parametrization
Consistent test data structure using Command objects

nvbn/thefuck

tests/rules/test_unsudo.py

            
import pytest
from thefuck.rules.unsudo import match, get_new_command
from thefuck.types import Command


@pytest.mark.parametrize('output', [
    'you cannot perform this operation as root'])
def test_match(output):
    assert match(Command('sudo ls', output))


def test_not_match():
    assert not match(Command('', ''))
    assert not match(Command('sudo ls', 'Permission denied'))
    assert not match(Command('ls', 'you cannot perform this operation as root'))


@pytest.mark.parametrize('before, after', [
    ('sudo ls', 'ls'),
    ('sudo pacaur -S helloworld', 'pacaur -S helloworld')])
def test_get_new_command(before, after):
    assert get_new_command(Command(before, '')) == after