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Testing Systemctl Command Correction Logic in TheFuck

This test suite validates the systemctl command correction functionality in TheFuck, focusing on properly ordering systemctl command arguments. It ensures the tool can detect and fix incorrect systemctl command syntax, particularly when service names and operations are in the wrong order.

Test Coverage Overview

The test suite provides comprehensive coverage of systemctl command corrections, specifically handling cases where users mistakenly place the service name before the operation.

Key areas tested include:

Command matching for incorrect systemctl syntax
Verification of both sudo and non-sudo commands
Validation of correct command transformations
Negative test cases for already correct commands

Implementation Analysis

The testing approach uses pytest to validate both the match and get_new_command functions of the systemctl rule. It employs a pattern of testing both positive and negative cases to ensure robust command correction behavior.

The implementation uses the Command type from TheFuck’s type system, demonstrating proper integration with the core framework components.

Technical Details

Testing tools and configuration:

pytest as the testing framework
Command type from thefuck.types for command representation
Systematic test case organization for match and command correction
Direct import of rule functions for unit testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices including clear separation of concerns between matching and command correction, comprehensive edge case coverage, and proper isolation of test cases.

Notable practices include:

Explicit test case naming
Separate test functions for different functionality
Comprehensive positive and negative test cases
Clean and focused test assertions

nvbn/thefuck

tests/rules/test_systemctl.py

            
from thefuck.rules.systemctl import match, get_new_command
from thefuck.types import Command


def test_match():
    assert match(Command('systemctl nginx start', 'Unknown operation \'nginx\'.'))
    assert match(Command('sudo systemctl nginx start', 'Unknown operation \'nginx\'.'))
    assert not match(Command('systemctl start nginx', ''))
    assert not match(Command('systemctl start nginx', ''))
    assert not match(Command('sudo systemctl nginx', 'Unknown operation \'nginx\'.'))
    assert not match(Command('systemctl nginx', 'Unknown operation \'nginx\'.'))
    assert not match(Command('systemctl start wtf', 'Failed to start wtf.service: Unit wtf.service failed to load: No such file or directory.'))


def test_get_new_command():
    assert get_new_command(Command('systemctl nginx start', '')) == "systemctl start nginx"
    assert get_new_command(Command('sudo systemctl nginx start', '')) == "sudo systemctl start nginx"