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Testing Brew Unknown Command Handler in TheFuck

This test suite validates the brew_unknown_command rule functionality in TheFuck project, focusing on handling invalid Homebrew commands. It verifies command matching and suggestion generation for unknown brew commands through comprehensive unit tests.

Test Coverage Overview

The test suite provides comprehensive coverage of the brew_unknown_command rule functionality.

Key areas tested include:

Command matching for unknown brew commands
Generation of alternative command suggestions
Validation against existing brew commands
Multiple error scenarios with different command variations

Implementation Analysis

The testing approach utilizes pytest fixtures to provide test data and isolate test cases.

Key implementation patterns include:

Fixture-based test data management
Command object validation
Multiple assertion checks per test case
Dynamic command validation against brew command list

Technical Details

Testing infrastructure includes:

Pytest framework for test organization
Custom Command type implementation
Brew command validation utilities
Fixture-based test data management
Module-level imports for rule functionality

Best Practices Demonstrated

The test suite exemplifies several testing best practices including isolation of test cases, comprehensive edge case coverage, and clear test organization.

Notable practices include:

Separate test fixtures for different scenarios
Explicit assertion messages
Comprehensive command validation
Clean test method organization

nvbn/thefuck

tests/rules/test_brew_unknown_command.py

            
import pytest
from thefuck.rules.brew_unknown_command import match, get_new_command
from thefuck.rules.brew_unknown_command import _brew_commands
from thefuck.types import Command


@pytest.fixture
def brew_unknown_cmd():
    return '''Error: Unknown command: inst'''


@pytest.fixture
def brew_unknown_cmd2():
    return '''Error: Unknown command: instaa'''


def test_match(brew_unknown_cmd):
    assert match(Command('brew inst', brew_unknown_cmd))
    for command in _brew_commands():
        assert not match(Command('brew ' + command, ''))


def test_get_new_command(brew_unknown_cmd, brew_unknown_cmd2):
    assert (get_new_command(Command('brew inst', brew_unknown_cmd))
            == ['brew list', 'brew install', 'brew uninstall'])

    cmds = get_new_command(Command('brew instaa', brew_unknown_cmd2))
    assert 'brew install' in cmds
    assert 'brew uninstall' in cmds